| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/07/07 16:07 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_RR",
"IP_VS_WRR",
"IP_VS_LC",
"IP_VS_WLC",
"IP_VS_FO",
"IP_VS_OVF",
"IP_VS_LBLC",
"IP_VS_LBLCR",
"IP_VS_DH",
"IP_VS_SH",
"IP_VS_MH",
"IP_VS_SED",
"IP_VS_NQ",
"IP_VS_TWOS"
],
"FocusSymbols": [
"ip_vs_bind_dest",
"ip_vs_unbind_dest",
"ip_vs_check_template",
"__ip_vs_update_dest",
"__ip_vs_unlink_dest",
"ip_vs_expire_nodest_conn_flush",
"ip_vs_dh_schedule",
"ip_vs_fo_schedule",
"ip_vs_lblc_schedule",
"__ip_vs_lblcr_schedule",
"ip_vs_lc_schedule",
"ip_vs_nq_schedule",
"ip_vs_ovf_schedule",
"ip_vs_rr_schedule",
"ip_vs_sed_schedule",
"ip_vs_twos_schedule",
"ip_vs_wlc_schedule",
"ip_vs_wrr_schedule"
],
"Reasoning": "The patch changes the `flags` field in `struct ip_vs_dest` to use atomic operations (`atomic_t`) instead of a `volatile unsigned int`. This affects how destination flags (like `IP_VS_DEST_F_AVAILABLE` and `IP_VS_DEST_F_OVERLOAD`) are read and updated across the IPVS core, connection management, and all IPVS schedulers. This is a functional change to core reachable logic, making it thread-safe, and should be fuzzed to ensure no regressions or race conditions occur.",
"WorthFuzzing": true
} |
| 1/1 | 2026/07/07 16:07 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit c56e7dca82236bc6a00fff238a9c0c2e5729ff39\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Jul 7 16:07:07 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/net/ip_vs.h b/include/net/ip_vs.h\nindex 49297fec448a82..bb969738ed7325 100644\n--- a/include/net/ip_vs.h\n+++ b/include/net/ip_vs.h\n@@ -972,7 +972,7 @@ struct ip_vs_dest {\n \tu16\t\t\taf;\t\t/* address family */\n \t__be16\t\t\tport;\t\t/* port number of the server */\n \tunion nf_inet_addr\taddr;\t\t/* IP address of the server */\n-\tvolatile unsigned int\tflags;\t\t/* dest status flags */\n+\tatomic_t\t\tflags;\t\t/* dest status flags */\n \tatomic_t\t\tconn_flags;\t/* flags to copy to conn */\n \tatomic_t\t\tweight;\t\t/* server weight */\n \tatomic_t\t\tlast_weight;\t/* server latest weight */\ndiff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c\nindex cb36641f8d1cc1..539f603f38b745 100644\n--- a/net/netfilter/ipvs/ip_vs_conn.c\n+++ b/net/netfilter/ipvs/ip_vs_conn.c\n@@ -1055,7 +1055,7 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)\n \n \tif (dest-\u003eu_threshold != 0 \u0026\u0026\n \t ip_vs_dest_totalconns(dest) \u003e= dest-\u003eu_threshold)\n-\t\tdest-\u003eflags |= IP_VS_DEST_F_OVERLOAD;\n+\t\tatomic_or(IP_VS_DEST_F_OVERLOAD, \u0026dest-\u003eflags);\n }\n \n \n@@ -1151,13 +1151,13 @@ static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)\n \n \tif (dest-\u003el_threshold != 0) {\n \t\tif (ip_vs_dest_totalconns(dest) \u003c dest-\u003el_threshold)\n-\t\t\tdest-\u003eflags \u0026= ~IP_VS_DEST_F_OVERLOAD;\n+\t\t\tatomic_and(~IP_VS_DEST_F_OVERLOAD, \u0026dest-\u003eflags);\n \t} else if (dest-\u003eu_threshold != 0) {\n \t\tif (ip_vs_dest_totalconns(dest) * 4 \u003c dest-\u003eu_threshold * 3)\n-\t\t\tdest-\u003eflags \u0026= ~IP_VS_DEST_F_OVERLOAD;\n+\t\t\tatomic_and(~IP_VS_DEST_F_OVERLOAD, \u0026dest-\u003eflags);\n \t} else {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n-\t\t\tdest-\u003eflags \u0026= ~IP_VS_DEST_F_OVERLOAD;\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\t\tatomic_and(~IP_VS_DEST_F_OVERLOAD, \u0026dest-\u003eflags);\n \t}\n \n \tip_vs_dest_put(dest);\n@@ -1188,7 +1188,7 @@ int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest)\n \t * Checking the dest server status.\n \t */\n \tif ((dest == NULL) ||\n-\t !(dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE) ||\n+\t !(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE) ||\n \t expire_quiescent_template(ipvs, dest) ||\n \t (cdest \u0026\u0026 (dest != cdest))) {\n \t\tIP_VS_DBG_BUF(9, \"check_template: dest not available for \"\n@@ -1929,7 +1929,7 @@ void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs)\n \t\t\tcp = ip_vs_hn0_to_conn(hn);\n \t\t\tresched_score++;\n \t\t\tdest = cp-\u003edest;\n-\t\t\tif (!dest || (dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE))\n+\t\t\tif (!dest || (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE))\n \t\t\t\tcontinue;\n \n \t\t\tif (atomic_read(\u0026cp-\u003en_control))\ndiff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex d40b404c1bf646..ca778937facf39 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -302,7 +302,7 @@ ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)\n \tstruct ip_vs_dest *dest = cp-\u003edest;\n \tstruct netns_ipvs *ipvs = cp-\u003eipvs;\n \n-\tif (dest \u0026\u0026 (dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)) {\n+\tif (dest \u0026\u0026 (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)) {\n \t\tstruct ip_vs_cpu_stats *s;\n \t\tstruct ip_vs_service *svc;\n \n@@ -338,7 +338,7 @@ ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)\n \tstruct ip_vs_dest *dest = cp-\u003edest;\n \tstruct netns_ipvs *ipvs = cp-\u003eipvs;\n \n-\tif (dest \u0026\u0026 (dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)) {\n+\tif (dest \u0026\u0026 (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)) {\n \t\tstruct ip_vs_cpu_stats *s;\n \t\tstruct ip_vs_service *svc;\n \n@@ -2204,7 +2204,7 @@ ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state\n \t}\n \n \t/* Check the server status */\n-\tif (cp \u0026\u0026 cp-\u003edest \u0026\u0026 !(cp-\u003edest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)) {\n+\tif (cp \u0026\u0026 cp-\u003edest \u0026\u0026 !(atomic_read(\u0026cp-\u003edest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)) {\n \t\t/* the destination server is not available */\n \t\tif (sysctl_expire_nodest_conn(ipvs)) {\n \t\t\tbool old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);\ndiff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c\nindex bcf40b8c41cf26..685b2675b6e03a 100644\n--- a/net/netfilter/ipvs/ip_vs_ctl.c\n+++ b/net/netfilter/ipvs/ip_vs_ctl.c\n@@ -1368,10 +1368,10 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,\n \t}\n \n \t/* set the dest status flags */\n-\tdest-\u003eflags |= IP_VS_DEST_F_AVAILABLE;\n+\tatomic_or(IP_VS_DEST_F_AVAILABLE, \u0026dest-\u003eflags);\n \n \tif (udest-\u003eu_threshold == 0 || udest-\u003eu_threshold \u003e dest-\u003eu_threshold)\n-\t\tdest-\u003eflags \u0026= ~IP_VS_DEST_F_OVERLOAD;\n+\t\tatomic_and(~IP_VS_DEST_F_OVERLOAD, \u0026dest-\u003eflags);\n \tdest-\u003eu_threshold = udest-\u003eu_threshold;\n \tdest-\u003el_threshold = udest-\u003el_threshold;\n \n@@ -1613,7 +1613,7 @@ static void __ip_vs_unlink_dest(struct ip_vs_service *svc,\n \t\t\t\tstruct ip_vs_dest *dest,\n \t\t\t\tint svcupd)\n {\n-\tdest-\u003eflags \u0026= ~IP_VS_DEST_F_AVAILABLE;\n+\tatomic_and(~IP_VS_DEST_F_AVAILABLE, \u0026dest-\u003eflags);\n \n \tspin_lock_bh(\u0026dest-\u003edst_lock);\n \t__ip_vs_dst_cache_reset(dest);\ndiff --git a/net/netfilter/ipvs/ip_vs_dh.c b/net/netfilter/ipvs/ip_vs_dh.c\nindex e1f62f6b25e211..39069a9c3d0c92 100644\n--- a/net/netfilter/ipvs/ip_vs_dh.c\n+++ b/net/netfilter/ipvs/ip_vs_dh.c\n@@ -201,7 +201,7 @@ static int ip_vs_dh_dest_changed(struct ip_vs_service *svc,\n */\n static inline int is_overloaded(struct ip_vs_dest *dest)\n {\n-\treturn dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD;\n+\treturn atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD;\n }\n \n \n@@ -220,7 +220,7 @@ ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \ts = (struct ip_vs_dh_state *) svc-\u003esched_data;\n \tdest = ip_vs_dh_get(svc-\u003eaf, s, \u0026iph-\u003edaddr);\n \tif (!dest\n-\t || !(dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)\n+\t || !(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)\n \t || atomic_read(\u0026dest-\u003eweight) \u003c= 0\n \t || is_overloaded(dest)) {\n \t\tip_vs_scheduler_err(svc, \"no destination available\");\ndiff --git a/net/netfilter/ipvs/ip_vs_fo.c b/net/netfilter/ipvs/ip_vs_fo.c\nindex d657b47c6511ff..5231e518c07c03 100644\n--- a/net/netfilter/ipvs/ip_vs_fo.c\n+++ b/net/netfilter/ipvs/ip_vs_fo.c\n@@ -29,7 +29,7 @@ ip_vs_fo_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t * Find virtual server with highest weight and send it traffic\n \t */\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n+\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n \t\t atomic_read(\u0026dest-\u003eweight) \u003e hw) {\n \t\t\thweight = dest;\n \t\t\thw = atomic_read(\u0026dest-\u003eweight);\ndiff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c\nindex 15ccb2b2fa1f4a..d2eb5dda5b686f 100644\n--- a/net/netfilter/ipvs/ip_vs_lblc.c\n+++ b/net/netfilter/ipvs/ip_vs_lblc.c\n@@ -414,7 +414,7 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)\n \t * new connection.\n \t */\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \t\tif (atomic_read(\u0026dest-\u003eweight) \u003e 0) {\n \t\t\tleast = dest;\n@@ -429,7 +429,7 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)\n \t */\n nextstage:\n \tlist_for_each_entry_continue_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tdoh = ip_vs_dest_conn_overhead(dest);\n@@ -502,7 +502,7 @@ ip_vs_lblc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t\t */\n \n \t\tdest = en-\u003edest;\n-\t\tif ((dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE) \u0026\u0026\n+\t\tif ((atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE) \u0026\u0026\n \t\t atomic_read(\u0026dest-\u003eweight) \u003e 0 \u0026\u0026 !is_overloaded(dest, svc))\n \t\t\tgoto out;\n \t}\ndiff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c\nindex c90ea897c3f756..f64881b8456969 100644\n--- a/net/netfilter/ipvs/ip_vs_lblcr.c\n+++ b/net/netfilter/ipvs/ip_vs_lblcr.c\n@@ -166,11 +166,11 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)\n \t/* select the first destination server, whose weight \u003e 0 */\n \tlist_for_each_entry_rcu(e, \u0026set-\u003elist, list) {\n \t\tleast = e-\u003edest;\n-\t\tif (least-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026least-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tif ((atomic_read(\u0026least-\u003eweight) \u003e 0)\n-\t\t \u0026\u0026 (least-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)) {\n+\t\t \u0026\u0026 (atomic_read(\u0026least-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)) {\n \t\t\tloh = ip_vs_dest_conn_overhead(least);\n \t\t\tgoto nextstage;\n \t\t}\n@@ -181,13 +181,13 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)\n nextstage:\n \tlist_for_each_entry_continue_rcu(e, \u0026set-\u003elist, list) {\n \t\tdest = e-\u003edest;\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tdoh = ip_vs_dest_conn_overhead(dest);\n \t\tif (((__s64)loh * atomic_read(\u0026dest-\u003eweight) \u003e\n \t\t (__s64)doh * atomic_read(\u0026least-\u003eweight))\n-\t\t \u0026\u0026 (dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)) {\n+\t\t \u0026\u0026 (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)) {\n \t\t\tleast = dest;\n \t\t\tloh = doh;\n \t\t}\n@@ -577,7 +577,7 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)\n \t * new connection.\n \t */\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tif (atomic_read(\u0026dest-\u003eweight) \u003e 0) {\n@@ -593,7 +593,7 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)\n \t */\n nextstage:\n \tlist_for_each_entry_continue_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tdoh = ip_vs_dest_conn_overhead(dest);\ndiff --git a/net/netfilter/ipvs/ip_vs_lc.c b/net/netfilter/ipvs/ip_vs_lc.c\nindex 38cc38c5d8bbd9..6acb3c904af57e 100644\n--- a/net/netfilter/ipvs/ip_vs_lc.c\n+++ b/net/netfilter/ipvs/ip_vs_lc.c\n@@ -38,7 +38,7 @@ ip_vs_lc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t */\n \n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif ((dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) ||\n+\t\tif ((atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) ||\n \t\t atomic_read(\u0026dest-\u003eweight) == 0)\n \t\t\tcontinue;\n \t\tdoh = ip_vs_dest_conn_overhead(dest);\ndiff --git a/net/netfilter/ipvs/ip_vs_mh.c b/net/netfilter/ipvs/ip_vs_mh.c\nindex 020863047562d3..c322ed1754b7f6 100644\n--- a/net/netfilter/ipvs/ip_vs_mh.c\n+++ b/net/netfilter/ipvs/ip_vs_mh.c\n@@ -80,7 +80,7 @@ static inline void generate_hash_secret(hsiphash_key_t *hash1,\n static inline bool is_unavailable(struct ip_vs_dest *dest)\n {\n \treturn atomic_read(\u0026dest-\u003eweight) \u003c= 0 ||\n-\t dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD;\n+\t atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD;\n }\n \n /* Returns hash value for IPVS MH entry */\ndiff --git a/net/netfilter/ipvs/ip_vs_nq.c b/net/netfilter/ipvs/ip_vs_nq.c\nindex ada158c610ce11..ffa4bfeb21d9d7 100644\n--- a/net/netfilter/ipvs/ip_vs_nq.c\n+++ b/net/netfilter/ipvs/ip_vs_nq.c\n@@ -72,7 +72,7 @@ ip_vs_nq_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n \n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD ||\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD ||\n \t\t !atomic_read(\u0026dest-\u003eweight))\n \t\t\tcontinue;\n \ndiff --git a/net/netfilter/ipvs/ip_vs_ovf.c b/net/netfilter/ipvs/ip_vs_ovf.c\nindex c5c67df80a0b3c..f7f17dddbb05a5 100644\n--- a/net/netfilter/ipvs/ip_vs_ovf.c\n+++ b/net/netfilter/ipvs/ip_vs_ovf.c\n@@ -33,7 +33,7 @@ ip_vs_ovf_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t*/\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n \t\tw = atomic_read(\u0026dest-\u003eweight);\n-\t\tif ((dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) ||\n+\t\tif ((atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) ||\n \t\t atomic_read(\u0026dest-\u003eactiveconns) \u003e w ||\n \t\t w == 0)\n \t\t\tcontinue;\ndiff --git a/net/netfilter/ipvs/ip_vs_rr.c b/net/netfilter/ipvs/ip_vs_rr.c\nindex 4125ee561cdc36..98453d205d6fad 100644\n--- a/net/netfilter/ipvs/ip_vs_rr.c\n+++ b/net/netfilter/ipvs/ip_vs_rr.c\n@@ -66,7 +66,7 @@ ip_vs_rr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t\tlist_for_each_entry_continue_rcu(dest,\n \t\t\t\t\t\t \u0026svc-\u003edestinations,\n \t\t\t\t\t\t n_list) {\n-\t\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n+\t\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n \t\t\t atomic_read(\u0026dest-\u003eweight) \u003e 0)\n \t\t\t\t/* HIT */\n \t\t\t\tgoto out;\ndiff --git a/net/netfilter/ipvs/ip_vs_sed.c b/net/netfilter/ipvs/ip_vs_sed.c\nindex 245a323c84cd32..0249062d136057 100644\n--- a/net/netfilter/ipvs/ip_vs_sed.c\n+++ b/net/netfilter/ipvs/ip_vs_sed.c\n@@ -75,7 +75,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t */\n \n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n+\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n \t\t atomic_read(\u0026dest-\u003eweight) \u003e 0) {\n \t\t\tleast = dest;\n \t\t\tloh = ip_vs_sed_dest_overhead(least);\n@@ -90,7 +90,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t */\n nextstage:\n \tlist_for_each_entry_continue_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \t\tdoh = ip_vs_sed_dest_overhead(dest);\n \t\tif ((__s64)loh * atomic_read(\u0026dest-\u003eweight) \u003e\ndiff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c\nindex cd67066e3b2612..343780b82c95f1 100644\n--- a/net/netfilter/ipvs/ip_vs_sh.c\n+++ b/net/netfilter/ipvs/ip_vs_sh.c\n@@ -73,7 +73,7 @@ struct ip_vs_sh_state {\n static inline bool is_unavailable(struct ip_vs_dest *dest)\n {\n \treturn atomic_read(\u0026dest-\u003eweight) \u003c= 0 ||\n-\t dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD;\n+\t atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD;\n }\n \n /*\ndiff --git a/net/netfilter/ipvs/ip_vs_twos.c b/net/netfilter/ipvs/ip_vs_twos.c\nindex dbb7f5fd4688a4..35fa4c6dc5cf4c 100644\n--- a/net/netfilter/ipvs/ip_vs_twos.c\n+++ b/net/netfilter/ipvs/ip_vs_twos.c\n@@ -52,7 +52,7 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,\n \n \t/* Generate a random weight between [0,sum of all weights) */\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)) {\n+\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)) {\n \t\t\tweight = atomic_read(\u0026dest-\u003eweight);\n \t\t\tif (weight \u003e 0) {\n \t\t\t\ttotal_weight += weight;\n@@ -75,7 +75,7 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,\n \n \t/* Pick two weighted servers */\n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \n \t\tweight = atomic_read(\u0026dest-\u003eweight);\ndiff --git a/net/netfilter/ipvs/ip_vs_wlc.c b/net/netfilter/ipvs/ip_vs_wlc.c\nindex 9da445ca09a14c..c2d09ac96fe84c 100644\n--- a/net/netfilter/ipvs/ip_vs_wlc.c\n+++ b/net/netfilter/ipvs/ip_vs_wlc.c\n@@ -47,7 +47,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t */\n \n \tlist_for_each_entry_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n+\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n \t\t atomic_read(\u0026dest-\u003eweight) \u003e 0) {\n \t\t\tleast = dest;\n \t\t\tloh = ip_vs_dest_conn_overhead(least);\n@@ -62,7 +62,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t */\n nextstage:\n \tlist_for_each_entry_continue_rcu(dest, \u0026svc-\u003edestinations, n_list) {\n-\t\tif (dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD)\n+\t\tif (atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD)\n \t\t\tcontinue;\n \t\tdoh = ip_vs_dest_conn_overhead(dest);\n \t\tif ((__s64)loh * atomic_read(\u0026dest-\u003eweight) \u003e\ndiff --git a/net/netfilter/ipvs/ip_vs_wrr.c b/net/netfilter/ipvs/ip_vs_wrr.c\nindex 2dcff1040da521..f21a75284971e5 100644\n--- a/net/netfilter/ipvs/ip_vs_wrr.c\n+++ b/net/netfilter/ipvs/ip_vs_wrr.c\n@@ -176,7 +176,7 @@ ip_vs_wrr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\n \t\tlist_for_each_entry_continue_rcu(dest,\n \t\t\t\t\t\t \u0026svc-\u003edestinations,\n \t\t\t\t\t\t n_list) {\n-\t\t\tif (!(dest-\u003eflags \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n+\t\t\tif (!(atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_OVERLOAD) \u0026\u0026\n \t\t\t atomic_read(\u0026dest-\u003eweight) \u003e= mark-\u003ecw)\n \t\t\t\tgoto found;\n \t\t\tif (dest == stop)\ndiff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c\nindex ce542ed4b013c8..37b9671e496001 100644\n--- a/net/netfilter/ipvs/ip_vs_xmit.c\n+++ b/net/netfilter/ipvs/ip_vs_xmit.c\n@@ -351,7 +351,7 @@ __ip_vs_get_out_rt(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,\n \t\t\t * stored in dest_trash.\n \t\t\t */\n \t\t\tif (!rt_dev_is_down(dst_dev_rcu(\u0026rt-\u003edst)) \u0026\u0026\n-\t\t\t dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)\n+\t\t\t atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)\n \t\t\t\t__ip_vs_dst_set(dest, dest_dst, \u0026rt-\u003edst, 0);\n \t\t\telse\n \t\t\t\tnoref = 0;\n@@ -530,7 +530,7 @@ __ip_vs_get_out_rt_v6(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,\n \t\t\t * stored in dest_trash.\n \t\t\t */\n \t\t\tif (!rt_dev_is_down(dst_dev_rcu(\u0026rt-\u003edst)) \u0026\u0026\n-\t\t\t dest-\u003eflags \u0026 IP_VS_DEST_F_AVAILABLE)\n+\t\t\t atomic_read(\u0026dest-\u003eflags) \u0026 IP_VS_DEST_F_AVAILABLE)\n \t\t\t\t__ip_vs_dst_set(dest, dest_dst, \u0026rt-\u003edst, cookie);\n \t\t\telse\n \t\t\t\tnoref = 0;\n"
} |
| 2/1 | 2026/07/07 16:07 | agent | patch-evaluator |
1mModel:gemini-3.1-pro-preview Args: null Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_RR",
"IP_VS_WRR",
"IP_VS_LC",
"IP_VS_WLC",
"IP_VS_FO",
"IP_VS_OVF",
"IP_VS_LBLC",
"IP_VS_LBLCR",
"IP_VS_DH",
"IP_VS_SH",
"IP_VS_MH",
"IP_VS_SED",
"IP_VS_NQ",
"IP_VS_TWOS"
],
"FocusSymbols": [
"ip_vs_bind_dest",
"ip_vs_unbind_dest",
"ip_vs_check_template",
"__ip_vs_update_dest",
"__ip_vs_unlink_dest",
"ip_vs_expire_nodest_conn_flush",
"ip_vs_dh_schedule",
"ip_vs_fo_schedule",
"ip_vs_lblc_schedule",
"__ip_vs_lblcr_schedule",
"ip_vs_lc_schedule",
"ip_vs_nq_schedule",
"ip_vs_ovf_schedule",
"ip_vs_rr_schedule",
"ip_vs_sed_schedule",
"ip_vs_twos_schedule",
"ip_vs_wlc_schedule",
"ip_vs_wrr_schedule"
],
"Reasoning": "The patch changes the `flags` field in `struct ip_vs_dest` to use atomic operations (`atomic_t`) instead of a `volatile unsigned int`. This affects how destination flags (like `IP_VS_DEST_F_AVAILABLE` and `IP_VS_DEST_F_OVERLOAD`) are read and updated across the IPVS core, connection management, and all IPVS schedulers. This is a functional change to core reachable logic, making it thread-safe, and should be fuzzed to ensure no regressions or race conditions occur.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit c56e7dca82236bc6a00fff238a9c0c2e5729ff39
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Jul 7 16:07:07 2026 +0000
syz-cluster: applied patch under review
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 49297fec448a82..bb969738ed7325 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -972,7 +972,7 @@ struct ip_vs_dest {
u16 af; /* address family */
__be16 port; /* port number of the server */
union nf_inet_addr addr; /* IP address of the server */
- volatile unsigned int flags; /* dest status flags */
+ atomic_t flags; /* dest status flags */
atomic_t conn_flags; /* flags to copy to conn */
atomic_t weight; /* server weight */
atomic_t last_weight; /* server latest weight */
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index cb36641f8d1cc1..539f603f38b745 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -1055,7 +1055,7 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
if (dest->u_threshold != 0 &&
ip_vs_dest_totalconns(dest) >= dest->u_threshold)
- dest->flags |= IP_VS_DEST_F_OVERLOAD;
+ atomic_or(IP_VS_DEST_F_OVERLOAD, &dest->flags);
}
@@ -1151,13 +1151,13 @@ static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
if (dest->l_threshold != 0) {
if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
- dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
+ atomic_and(~IP_VS_DEST_F_OVERLOAD, &dest->flags);
} else if (dest->u_threshold != 0) {
if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
- dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
+ atomic_and(~IP_VS_DEST_F_OVERLOAD, &dest->flags);
} else {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
- dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
+ atomic_and(~IP_VS_DEST_F_OVERLOAD, &dest->flags);
}
ip_vs_dest_put(dest);
@@ -1188,7 +1188,7 @@ int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest)
* Checking the dest server status.
*/
if ((dest == NULL) ||
- !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
+ !(atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE) ||
expire_quiescent_template(ipvs, dest) ||
(cdest && (dest != cdest))) {
IP_VS_DBG_BUF(9, "check_template: dest not available for "
@@ -1929,7 +1929,7 @@ void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs)
cp = ip_vs_hn0_to_conn(hn);
resched_score++;
dest = cp->dest;
- if (!dest || (dest->flags & IP_VS_DEST_F_AVAILABLE))
+ if (!dest || (atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE))
continue;
if (atomic_read(&cp->n_control))
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index d40b404c1bf646..ca778937facf39 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -302,7 +302,7 @@ ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
struct ip_vs_dest *dest = cp->dest;
struct netns_ipvs *ipvs = cp->ipvs;
- if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ if (dest && (atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)) {
struct ip_vs_cpu_stats *s;
struct ip_vs_service *svc;
@@ -338,7 +338,7 @@ ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
struct ip_vs_dest *dest = cp->dest;
struct netns_ipvs *ipvs = cp->ipvs;
- if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ if (dest && (atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)) {
struct ip_vs_cpu_stats *s;
struct ip_vs_service *svc;
@@ -2204,7 +2204,7 @@ ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state
}
/* Check the server status */
- if (cp && cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ if (cp && cp->dest && !(atomic_read(&cp->dest->flags) & IP_VS_DEST_F_AVAILABLE)) {
/* the destination server is not available */
if (sysctl_expire_nodest_conn(ipvs)) {
bool old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index bcf40b8c41cf26..685b2675b6e03a 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1368,10 +1368,10 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
}
/* set the dest status flags */
- dest->flags |= IP_VS_DEST_F_AVAILABLE;
+ atomic_or(IP_VS_DEST_F_AVAILABLE, &dest->flags);
if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
- dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
+ atomic_and(~IP_VS_DEST_F_OVERLOAD, &dest->flags);
dest->u_threshold = udest->u_threshold;
dest->l_threshold = udest->l_threshold;
@@ -1613,7 +1613,7 @@ static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
struct ip_vs_dest *dest,
int svcupd)
{
- dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
+ atomic_and(~IP_VS_DEST_F_AVAILABLE, &dest->flags);
spin_lock_bh(&dest->dst_lock);
__ip_vs_dst_cache_reset(dest);
diff --git a/net/netfilter/ipvs/ip_vs_dh.c b/net/netfilter/ipvs/ip_vs_dh.c
index e1f62f6b25e211..39069a9c3d0c92 100644
--- a/net/netfilter/ipvs/ip_vs_dh.c
+++ b/net/netfilter/ipvs/ip_vs_dh.c
@@ -201,7 +201,7 @@ static int ip_vs_dh_dest_changed(struct ip_vs_service *svc,
*/
static inline int is_overloaded(struct ip_vs_dest *dest)
{
- return dest->flags & IP_VS_DEST_F_OVERLOAD;
+ return atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD;
}
@@ -220,7 +220,7 @@ ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
s = (struct ip_vs_dh_state *) svc->sched_data;
dest = ip_vs_dh_get(svc->af, s, &iph->daddr);
if (!dest
- || !(dest->flags & IP_VS_DEST_F_AVAILABLE)
+ || !(atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)
|| atomic_read(&dest->weight) <= 0
|| is_overloaded(dest)) {
ip_vs_scheduler_err(svc, "no destination available");
diff --git a/net/netfilter/ipvs/ip_vs_fo.c b/net/netfilter/ipvs/ip_vs_fo.c
index d657b47c6511ff..5231e518c07c03 100644
--- a/net/netfilter/ipvs/ip_vs_fo.c
+++ b/net/netfilter/ipvs/ip_vs_fo.c
@@ -29,7 +29,7 @@ ip_vs_fo_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
* Find virtual server with highest weight and send it traffic
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) &&
atomic_read(&dest->weight) > hw) {
hweight = dest;
hw = atomic_read(&dest->weight);
diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 15ccb2b2fa1f4a..d2eb5dda5b686f 100644
--- a/net/netfilter/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
@@ -414,7 +414,7 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)
* new connection.
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
if (atomic_read(&dest->weight) > 0) {
least = dest;
@@ -429,7 +429,7 @@ __ip_vs_lblc_schedule(struct ip_vs_service *svc)
*/
nextstage:
list_for_each_entry_continue_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_dest_conn_overhead(dest);
@@ -502,7 +502,7 @@ ip_vs_lblc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
dest = en->dest;
- if ((dest->flags & IP_VS_DEST_F_AVAILABLE) &&
+ if ((atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE) &&
atomic_read(&dest->weight) > 0 && !is_overloaded(dest, svc))
goto out;
}
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index c90ea897c3f756..f64881b8456969 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -166,11 +166,11 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)
/* select the first destination server, whose weight > 0 */
list_for_each_entry_rcu(e, &set->list, list) {
least = e->dest;
- if (least->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&least->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
if ((atomic_read(&least->weight) > 0)
- && (least->flags & IP_VS_DEST_F_AVAILABLE)) {
+ && (atomic_read(&least->flags) & IP_VS_DEST_F_AVAILABLE)) {
loh = ip_vs_dest_conn_overhead(least);
goto nextstage;
}
@@ -181,13 +181,13 @@ static inline struct ip_vs_dest *ip_vs_dest_set_min(struct ip_vs_dest_set *set)
nextstage:
list_for_each_entry_continue_rcu(e, &set->list, list) {
dest = e->dest;
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_dest_conn_overhead(dest);
if (((__s64)loh * atomic_read(&dest->weight) >
(__s64)doh * atomic_read(&least->weight))
- && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ && (atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)) {
least = dest;
loh = doh;
}
@@ -577,7 +577,7 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)
* new connection.
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
if (atomic_read(&dest->weight) > 0) {
@@ -593,7 +593,7 @@ __ip_vs_lblcr_schedule(struct ip_vs_service *svc)
*/
nextstage:
list_for_each_entry_continue_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_dest_conn_overhead(dest);
diff --git a/net/netfilter/ipvs/ip_vs_lc.c b/net/netfilter/ipvs/ip_vs_lc.c
index 38cc38c5d8bbd9..6acb3c904af57e 100644
--- a/net/netfilter/ipvs/ip_vs_lc.c
+++ b/net/netfilter/ipvs/ip_vs_lc.c
@@ -38,7 +38,7 @@ ip_vs_lc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if ((dest->flags & IP_VS_DEST_F_OVERLOAD) ||
+ if ((atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) ||
atomic_read(&dest->weight) == 0)
continue;
doh = ip_vs_dest_conn_overhead(dest);
diff --git a/net/netfilter/ipvs/ip_vs_mh.c b/net/netfilter/ipvs/ip_vs_mh.c
index 020863047562d3..c322ed1754b7f6 100644
--- a/net/netfilter/ipvs/ip_vs_mh.c
+++ b/net/netfilter/ipvs/ip_vs_mh.c
@@ -80,7 +80,7 @@ static inline void generate_hash_secret(hsiphash_key_t *hash1,
static inline bool is_unavailable(struct ip_vs_dest *dest)
{
return atomic_read(&dest->weight) <= 0 ||
- dest->flags & IP_VS_DEST_F_OVERLOAD;
+ atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD;
}
/* Returns hash value for IPVS MH entry */
diff --git a/net/netfilter/ipvs/ip_vs_nq.c b/net/netfilter/ipvs/ip_vs_nq.c
index ada158c610ce11..ffa4bfeb21d9d7 100644
--- a/net/netfilter/ipvs/ip_vs_nq.c
+++ b/net/netfilter/ipvs/ip_vs_nq.c
@@ -72,7 +72,7 @@ ip_vs_nq_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD ||
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD ||
!atomic_read(&dest->weight))
continue;
diff --git a/net/netfilter/ipvs/ip_vs_ovf.c b/net/netfilter/ipvs/ip_vs_ovf.c
index c5c67df80a0b3c..f7f17dddbb05a5 100644
--- a/net/netfilter/ipvs/ip_vs_ovf.c
+++ b/net/netfilter/ipvs/ip_vs_ovf.c
@@ -33,7 +33,7 @@ ip_vs_ovf_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
w = atomic_read(&dest->weight);
- if ((dest->flags & IP_VS_DEST_F_OVERLOAD) ||
+ if ((atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) ||
atomic_read(&dest->activeconns) > w ||
w == 0)
continue;
diff --git a/net/netfilter/ipvs/ip_vs_rr.c b/net/netfilter/ipvs/ip_vs_rr.c
index 4125ee561cdc36..98453d205d6fad 100644
--- a/net/netfilter/ipvs/ip_vs_rr.c
+++ b/net/netfilter/ipvs/ip_vs_rr.c
@@ -66,7 +66,7 @@ ip_vs_rr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
list_for_each_entry_continue_rcu(dest,
&svc->destinations,
n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) &&
atomic_read(&dest->weight) > 0)
/* HIT */
goto out;
diff --git a/net/netfilter/ipvs/ip_vs_sed.c b/net/netfilter/ipvs/ip_vs_sed.c
index 245a323c84cd32..0249062d136057 100644
--- a/net/netfilter/ipvs/ip_vs_sed.c
+++ b/net/netfilter/ipvs/ip_vs_sed.c
@@ -75,7 +75,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) &&
atomic_read(&dest->weight) > 0) {
least = dest;
loh = ip_vs_sed_dest_overhead(least);
@@ -90,7 +90,7 @@ ip_vs_sed_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
nextstage:
list_for_each_entry_continue_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_sed_dest_overhead(dest);
if ((__s64)loh * atomic_read(&dest->weight) >
diff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
index cd67066e3b2612..343780b82c95f1 100644
--- a/net/netfilter/ipvs/ip_vs_sh.c
+++ b/net/netfilter/ipvs/ip_vs_sh.c
@@ -73,7 +73,7 @@ struct ip_vs_sh_state {
static inline bool is_unavailable(struct ip_vs_dest *dest)
{
return atomic_read(&dest->weight) <= 0 ||
- dest->flags & IP_VS_DEST_F_OVERLOAD;
+ atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD;
}
/*
diff --git a/net/netfilter/ipvs/ip_vs_twos.c b/net/netfilter/ipvs/ip_vs_twos.c
index dbb7f5fd4688a4..35fa4c6dc5cf4c 100644
--- a/net/netfilter/ipvs/ip_vs_twos.c
+++ b/net/netfilter/ipvs/ip_vs_twos.c
@@ -52,7 +52,7 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,
/* Generate a random weight between [0,sum of all weights) */
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD)) {
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)) {
weight = atomic_read(&dest->weight);
if (weight > 0) {
total_weight += weight;
@@ -75,7 +75,7 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,
/* Pick two weighted servers */
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
weight = atomic_read(&dest->weight);
diff --git a/net/netfilter/ipvs/ip_vs_wlc.c b/net/netfilter/ipvs/ip_vs_wlc.c
index 9da445ca09a14c..c2d09ac96fe84c 100644
--- a/net/netfilter/ipvs/ip_vs_wlc.c
+++ b/net/netfilter/ipvs/ip_vs_wlc.c
@@ -47,7 +47,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) &&
atomic_read(&dest->weight) > 0) {
least = dest;
loh = ip_vs_dest_conn_overhead(least);
@@ -62,7 +62,7 @@ ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
*/
nextstage:
list_for_each_entry_continue_rcu(dest, &svc->destinations, n_list) {
- if (dest->flags & IP_VS_DEST_F_OVERLOAD)
+ if (atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD)
continue;
doh = ip_vs_dest_conn_overhead(dest);
if ((__s64)loh * atomic_read(&dest->weight) >
diff --git a/net/netfilter/ipvs/ip_vs_wrr.c b/net/netfilter/ipvs/ip_vs_wrr.c
index 2dcff1040da521..f21a75284971e5 100644
--- a/net/netfilter/ipvs/ip_vs_wrr.c
+++ b/net/netfilter/ipvs/ip_vs_wrr.c
@@ -176,7 +176,7 @@ ip_vs_wrr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
list_for_each_entry_continue_rcu(dest,
&svc->destinations,
n_list) {
- if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
+ if (!(atomic_read(&dest->flags) & IP_VS_DEST_F_OVERLOAD) &&
atomic_read(&dest->weight) >= mark->cw)
goto found;
if (dest == stop)
diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index ce542ed4b013c8..37b9671e496001 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -351,7 +351,7 @@ __ip_vs_get_out_rt(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
* stored in dest_trash.
*/
if (!rt_dev_is_down(dst_dev_rcu(&rt->dst)) &&
- dest->flags & IP_VS_DEST_F_AVAILABLE)
+ atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)
__ip_vs_dst_set(dest, dest_dst, &rt->dst, 0);
else
noref = 0;
@@ -530,7 +530,7 @@ __ip_vs_get_out_rt_v6(struct netns_ipvs *ipvs, int skb_af, struct sk_buff *skb,
* stored in dest_trash.
*/
if (!rt_dev_is_down(dst_dev_rcu(&rt->dst)) &&
- dest->flags & IP_VS_DEST_F_AVAILABLE)
+ atomic_read(&dest->flags) & IP_VS_DEST_F_AVAILABLE)
__ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie);
else
noref = 0;
|
| 3/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9467 output: 34 thoughts: 163 Thoughts: **Analyzing the IPVS Flags Field Change** Okay, so this patch is a functional change within IPVS, specifically related to the `flags` field within the `struct ip_vs_dest`. They're swapping out the `volatile unsigned int` for an `atomic_t`, and that immediately tells me they're making this thread-safe. That's a solid move, and a common pattern when dealing with shared state in a kernel context. The change ensures atomicity for all reads, writes, and modifications using the atomic operation primitives. Good, good. IPVS is netfilter based, so this will be in `net/netfilter/ipvs`. Now, before I dig too deep into the code, I want to confirm what config options are exposed for IPVS. I'm going to quickly grep for anything related to `IP_VS` within the `Kconfig` files under `net/netfilter/ipvs/` or anything similar to get a high-level view of how this is controlled. It's always helpful to understand the build-time configuration that's available before getting into specifics. |
| 4/2 | 2026/07/07 16:07 | tool | grepper |
0mArgs:{
"Expression": "config IP_VS",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n"
} |
| 5/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10169 output: 36 thoughts: 159 Thoughts: **Examining IPVS Scheduler Configurations** Okay, so the primary configuration I'm looking at here is `IP_VS`. That's the foundation. Now, I need to drill down and see how the various scheduling algorithms might be affected, or if there are any specific configurations linked to the scheduler modifications. Let's see...I need to investigate the associated source files that implement those schedulers. Looks like the following files require closer examination: `ip_vs_dh.c`, `ip_vs_fo.c`, `ip_vs_lblc.c`, `ip_vs_lblcr.c`, `ip_vs_lc.c`, `ip_vs_mh.c`, `ip_vs_nq.c`, `ip_vs_ovf.c`, `ip_vs_rr.c`, `ip_vs_sed.c`, `ip_vs_sh.c`, `ip_vs_twos.c`, `ip_vs_wlc.c`, and `ip_vs_wrr.c`. Those are the areas where I'll need to focus my attention to determine if any auxiliary configurations or settings are involved. |
| 6/2 | 2026/07/07 16:07 | tool | grepper |
0mArgs:{
"Expression": "config IP_VS_.*",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n"
} |
| 7/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10825 output: 35 thoughts: 29 Thoughts: Okay, here's my summary, presented as a stream of thought: **Expanding the Scope of Investigation** Hmm, I need to dig deeper into this configuration item. Instead of just focusing on the specific `config IP_VS_` variable I was initially looking at in `net/netfilter/ipvs/Kconfig`, it would be more efficient and thorough to perform a broader grep search. I should really look for *any* instance of `config IP_VS_` within that file, and perhaps even within the broader netfilter directory structure. This way, I can ensure I haven't missed any related configuration options, dependencies, or implications. It'll give me a more complete picture of how this feature is defined and interacts within the kernel's configuration landscape. |
| 8/2 | 2026/07/07 16:07 | tool | grepper |
0mArgs:{
"Expression": "^config IP_VS",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n"
} |
| 9/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11262 output: 33 thoughts: 26 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing the Configuration Source** Alright, so I need to figure out how this configuration is handled. My first thought is to just dive into the source code directly. The most straightforward approach would be to simply read the file, probably in the `net/netfilter/ipvs/Kconfig` directory. That's the obvious place to start for any kernel configuration option. Or, to be more efficient, I could use `grep` – that's often quicker than manually scanning. Searching for "config " within that file should reveal the specific variables used to control the build options. I'm leaning toward the `grep` approach initially; it’s usually the fastest way to get a quick overview of what's defined. Let's see what that yields. |
| 10/2 | 2026/07/07 16:07 | tool | grepper |
0mArgs:{
"Expression": "^config ",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig=100=config\tIP_VS_PROTO_AH\n--\nnet/netfilter/ipvs/Kconfig-105-\nnet/netfilter/ipvs/Kconfig:106:config IP_VS_PROTO_SCTP\nnet/netfilter/ipvs/Kconfig-107-\tbool \"SCTP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=147=config\tIP_VS_WLC\n--\nnet/netfilter/ipvs/Kconfig-156-\nnet/netfilter/ipvs/Kconfig:157:config IP_VS_FO\nnet/netfilter/ipvs/Kconfig-158-\t\ttristate \"weighted failover scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-166-\nnet/netfilter/ipvs/Kconfig:167:config IP_VS_OVF\nnet/netfilter/ipvs/Kconfig-168-\ttristate \"weighted overflow scheduling\"\n--\nnet/netfilter/ipvs/Kconfig=178=config\tIP_VS_LBLC\n--\nnet/netfilter/ipvs/Kconfig-191-\nnet/netfilter/ipvs/Kconfig:192:config IP_VS_LBLCR\nnet/netfilter/ipvs/Kconfig-193-\ttristate \"locality-based least-connection with replication scheduling\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n--\nnet/netfilter/ipvs/Kconfig=345=config\tIP_VS_PE_SIP\n--\nnet/netfilter/ipvs/Kconfig-351-\nnet/netfilter/ipvs/Kconfig:352:config GCOV_PROFILE_IPVS\nnet/netfilter/ipvs/Kconfig-353-\tbool \"Enable GCOV profiling for IPVS\"\n"
} |
| 11/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12166 output: 37 thoughts: 16 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience: **Truncated Output Frustration, Time for a Direct Approach** Alright, the `grep` output is truncated again. Seriously? This is a frequent annoyance. It's usually faster to just read the whole damned file rather than futzing around trying to increase the buffer or pipe it through `less -S` just to see the damn contents. This truncation adds an extra layer of cognitive load, forcing me to rethink my workflow, so forget that and lets just read the file directly - sometimes the simple methods are best, especially when you have some specific files to review. Time to bypass the intermediate step and get right to the source. |
| 12/2 | 2026/07/07 16:07 | tool | read-file |
0mArgs:{
"File": "net/netfilter/ipvs/Kconfig",
"FirstLine": 1,
"LineCount": 100
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# IP Virtual Server configuration\n 4:\t#\n 5:\tmenuconfig IP_VS\n 6:\t\ttristate \"IP virtual server support\"\n 7:\t\tdepends on INET \u0026\u0026 NETFILTER\n 8:\t\tdepends on (NF_CONNTRACK || NF_CONNTRACK=n)\n 9:\t\thelp\n 10:\t\t IP Virtual Server support will let you build a high-performance\n 11:\t\t virtual server based on cluster of two or more real servers. This\n 12:\t\t option must be enabled for at least one of the clustered computers\n 13:\t\t that will take care of intercepting incoming connections to a\n 14:\t\t single IP address and scheduling them to real servers.\n 15:\t\n 16:\t\t Three request dispatching techniques are implemented, they are\n 17:\t\t virtual server via NAT, virtual server via tunneling and virtual\n 18:\t\t server via direct routing. The several scheduling algorithms can\n 19:\t\t be used to choose which server the connection is directed to,\n 20:\t\t thus load balancing can be achieved among the servers. For more\n 21:\t\t information and its administration program, please visit the\n 22:\t\t following URL: \u003chttp://www.linuxvirtualserver.org/\u003e.\n 23:\t\n 24:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 25:\t\t module, choose M here. If unsure, say N.\n 26:\t\n 27:\tif IP_VS\n 28:\t\n 29:\tconfig\tIP_VS_IPV6\n 30:\t\tbool \"IPv6 support for IPVS\"\n 31:\t\tdepends on IPV6 = y || IP_VS = IPV6\n 32:\t\tselect NF_DEFRAG_IPV6\n 33:\t\thelp\n 34:\t\t Add IPv6 support to IPVS.\n 35:\t\n 36:\t\t Say Y if unsure.\n 37:\t\n 38:\tconfig\tIP_VS_DEBUG\n 39:\t\tbool \"IP virtual server debugging\"\n 40:\t\thelp\n 41:\t\t Say Y here if you want to get additional messages useful in\n 42:\t\t debugging the IP virtual server code. You can change the debug\n 43:\t\t level in /proc/sys/net/ipv4/vs/debug_level\n 44:\t\n 45:\tconfig\tIP_VS_TAB_BITS\n 46:\t\tint \"IPVS connection table size (the Nth power of 2)\"\n 47:\t\trange 8 20 if !64BIT\n 48:\t\trange 8 27 if 64BIT\n 49:\t\tdefault 12\n 50:\t\thelp\n 51:\t\t The IPVS connection hash table uses the chaining scheme to handle\n 52:\t\t hash collisions. Using a big IPVS connection hash table will greatly\n 53:\t\t reduce conflicts when there are hundreds of thousands of connections\n 54:\t\t in the hash table.\n 55:\t\n 56:\t\t Note the table size must be power of 2. The table size will be the\n 57:\t\t value of 2 to the your input number power. The number to choose is\n 58:\t\t from 8 to 27 for 64BIT(20 otherwise), the default number is 12,\n 59:\t\t which means the table size is 4096. Don't input the number too\n 60:\t\t small, otherwise you will lose performance on it. You can adapt the\n 61:\t\t table size yourself, according to your virtual server application.\n 62:\t\t It is good to set the table size not far less than the number of\n 63:\t\t connections per second multiplying average lasting time of\n 64:\t\t connection in the table. For example, your virtual server gets 200\n 65:\t\t connections per second, the connection lasts for 200 seconds in\n 66:\t\t average in the connection table, the table size should be not far\n 67:\t\t less than 200x200, it is good to set the table size 32768 (2**15).\n 68:\t\n 69:\t\t Another note that each connection occupies 128 bytes effectively and\n 70:\t\t each hash entry uses 8 bytes, so you can estimate how much memory is\n 71:\t\t needed for your box.\n 72:\t\n 73:\t\t You can overwrite this number setting conn_tab_bits module parameter\n 74:\t\t or by appending ip_vs.conn_tab_bits=? to the kernel command line if\n 75:\t\t IP VS was compiled built-in.\n 76:\t\n 77:\tcomment \"IPVS transport protocol load balancing support\"\n 78:\t\n 79:\tconfig\tIP_VS_PROTO_TCP\n 80:\t\tbool \"TCP load balancing support\"\n 81:\t\thelp\n 82:\t\t This option enables support for load balancing TCP transport\n 83:\t\t protocol. Say Y if unsure.\n 84:\t\n 85:\tconfig\tIP_VS_PROTO_UDP\n 86:\t\tbool \"UDP load balancing support\"\n 87:\t\thelp\n 88:\t\t This option enables support for load balancing UDP transport\n 89:\t\t protocol. Say Y if unsure.\n 90:\t\n 91:\tconfig\tIP_VS_PROTO_AH_ESP\n 92:\t\tdef_bool IP_VS_PROTO_ESP || IP_VS_PROTO_AH\n 93:\t\n 94:\tconfig\tIP_VS_PROTO_ESP\n 95:\t\tbool \"ESP load balancing support\"\n 96:\t\thelp\n 97:\t\t This option enables support for load balancing ESP (Encapsulation\n 98:\t\t Security Payload) transport protocol. Say Y if unsure.\n 99:\t\n 100:\tconfig\tIP_VS_PROTO_AH\n"
} |
| 13/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13880 output: 39 thoughts: 6 Thoughts: Okay, I'm ready. Let's get to it. *** **My Initial Assessment and Anticipation** Alright, let's dive in. The instruction is pretty straightforward - I'm supposed to process this text and represent it as my own thought process, in first-person, as though I'm reading it and formulating my understanding. Given my expertise, I anticipate this will be a relatively quick and efficient task. It's about distilling the core ideas and internalizing them. Now, let's see what we've got. Let's see what's on the page. |
| 14/2 | 2026/07/07 16:07 | tool | read-file |
0mArgs:{
"File": "net/netfilter/ipvs/Kconfig",
"FirstLine": 101,
"LineCount": 100
}Results: {
"Contents": " 101:\t\tbool \"AH load balancing support\"\n 102:\t\thelp\n 103:\t\t This option enables support for load balancing AH (Authentication\n 104:\t\t Header) transport protocol. Say Y if unsure.\n 105:\t\n 106:\tconfig IP_VS_PROTO_SCTP\n 107:\t\tbool \"SCTP load balancing support\"\n 108:\t\tselect NET_CRC32C\n 109:\t\thelp\n 110:\t\t This option enables support for load balancing SCTP transport\n 111:\t\t protocol. Say Y if unsure.\n 112:\t\n 113:\tcomment \"IPVS scheduler\"\n 114:\t\n 115:\tconfig\tIP_VS_RR\n 116:\t\ttristate \"round-robin scheduling\"\n 117:\t\thelp\n 118:\t\t The robin-robin scheduling algorithm simply directs network\n 119:\t\t connections to different real servers in a round-robin manner.\n 120:\t\n 121:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 122:\t\t module, choose M here. If unsure, say N.\n 123:\t \n 124:\tconfig\tIP_VS_WRR\n 125:\t\ttristate \"weighted round-robin scheduling\"\n 126:\t\thelp\n 127:\t\t The weighted robin-robin scheduling algorithm directs network\n 128:\t\t connections to different real servers based on server weights\n 129:\t\t in a round-robin manner. Servers with higher weights receive\n 130:\t\t new connections first than those with less weights, and servers\n 131:\t\t with higher weights get more connections than those with less\n 132:\t\t weights and servers with equal weights get equal connections.\n 133:\t\n 134:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 135:\t\t module, choose M here. If unsure, say N.\n 136:\t\n 137:\tconfig\tIP_VS_LC\n 138:\t\ttristate \"least-connection scheduling\"\n 139:\t\thelp\n 140:\t\t The least-connection scheduling algorithm directs network\n 141:\t\t connections to the server with the least number of active \n 142:\t\t connections.\n 143:\t\n 144:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 145:\t\t module, choose M here. If unsure, say N.\n 146:\t\n 147:\tconfig\tIP_VS_WLC\n 148:\t\ttristate \"weighted least-connection scheduling\"\n 149:\t\thelp\n 150:\t\t The weighted least-connection scheduling algorithm directs network\n 151:\t\t connections to the server with the least active connections\n 152:\t\t normalized by the server weight.\n 153:\t\n 154:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 155:\t\t module, choose M here. If unsure, say N.\n 156:\t\n 157:\tconfig IP_VS_FO\n 158:\t\t\ttristate \"weighted failover scheduling\"\n 159:\t\thelp\n 160:\t\t The weighted failover scheduling algorithm directs network\n 161:\t\t connections to the server with the highest weight that is\n 162:\t\t currently available.\n 163:\t\n 164:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 165:\t\t module, choose M here. If unsure, say N.\n 166:\t\n 167:\tconfig IP_VS_OVF\n 168:\t\ttristate \"weighted overflow scheduling\"\n 169:\t\thelp\n 170:\t\t The weighted overflow scheduling algorithm directs network\n 171:\t\t connections to the server with the highest weight that is\n 172:\t\t currently available and overflows to the next when active\n 173:\t\t connections exceed the node's weight.\n 174:\t\n 175:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 176:\t\t module, choose M here. If unsure, say N.\n 177:\t\n 178:\tconfig\tIP_VS_LBLC\n 179:\t\ttristate \"locality-based least-connection scheduling\"\n 180:\t\thelp\n 181:\t\t The locality-based least-connection scheduling algorithm is for\n 182:\t\t destination IP load balancing. It is usually used in cache cluster.\n 183:\t\t This algorithm usually directs packet destined for an IP address to\n 184:\t\t its server if the server is alive and under load. If the server is\n 185:\t\t overloaded (its active connection numbers is larger than its weight)\n 186:\t\t and there is a server in its half load, then allocate the weighted\n 187:\t\t least-connection server to this IP address.\n 188:\t\n 189:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 190:\t\t module, choose M here. If unsure, say N.\n 191:\t\n 192:\tconfig IP_VS_LBLCR\n 193:\t\ttristate \"locality-based least-connection with replication scheduling\"\n 194:\t\thelp\n 195:\t\t The locality-based least-connection with replication scheduling\n 196:\t\t algorithm is also for destination IP load balancing. It is \n 197:\t\t usually used in cache cluster. It differs from the LBLC scheduling\n 198:\t\t as follows: the load balancer maintains mappings from a target\n 199:\t\t to a set of server nodes that can serve the target. Requests for\n 200:\t\t a target are assigned to the least-connection node in the target's\n"
} |
| 15/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15596 output: 39 thoughts: 71 Thoughts: Okay, here's my interpretation of these concepts, presented as my own thought process, as requested: **Understanding the IP Virtual Server (IPVS) Scheduling Algorithms** Alright, let's break this down. We're looking at different scheduling algorithms within the IPVS framework. My mind immediately goes to how each of these impacts load distribution and failover behavior. I see a core set of fundamental scheduling methods, essentially the building blocks here, and then some more specialized variations. First, we have the general `IP_VS` which probably implies a basic, likely round-robin, approach if nothing else is specified. Then we see its variations. `IP_VS_RR` – well, that's straightforward round robin, classic, simple, and predictable. `IP_VS_WRR` – Weighted Round Robin. Now we're getting into more nuanced control based on server capacity or some assigned weight. This is a very common method in production environments where servers are not equal. Then we have `IP_VS_LC` and `IP_VS_WLC` – Least Connections and Weighted Least Connections. This is where things get interesting and more dynamic. I'm thinking about the real-time state of the servers, how busy they actually are, taking into account current connections. `IP_VS_LC` is about distributing based on *active* connections, which is useful when server response times are relatively equal. `IP_VS_WLC` extends this and adds weighting – even on a dynamic basis – which is crucial if you have servers with different processing capabilities, or if you need to provide more capacity to one server to handle a large load. `IP_VS_FO` – Ah, this one's for failover! This must be the algorithm for "first-available" or fail-over only. Useful in many scenarios where you need to have a standby server in case the first goes down. `IP_VS_OVF` – This looks like Overflow, perhaps a variation on load balancing in case of one server reaching a threshold. The system might start sending traffic to another. I have to look into the specifics here. And finally, `IP_VS_LBLC` and `IP_VS_LBLCR`. Now, this signals something different. This seems to be connection locality, maybe based on source IP address and with or without persistence (`R`?). This is critical for scenarios that require persistent sessions or sticky connections. `LBLCR` probably indicates a connection hashing approach based on client source IP (likely for sticky sessions). So, in essence, this is a clear enumeration of the scheduling algorithms available in the IPVS system, a set of tools in my arsenal for managing and distributing load across a collection of back-end servers. Each one offers different trade-offs in terms of simplicity, performance, and flexibility, and the choice depends entirely on the specific application requirements and the characteristics of the back-end servers. I need to keep these concepts organized and consider them when designing load balancing strategies. I'll need to remember these and compare/contrast them to other balancing options. |
| 16/2 | 2026/07/07 16:07 | tool | read-file |
0mArgs:{
"File": "net/netfilter/ipvs/Kconfig",
"FirstLine": 201,
"LineCount": 100
}Results: {
"Contents": " 201:\t\t server set. If all the node in the server set are over loaded,\n 202:\t\t it picks up a least-connection node in the cluster and adds it\n 203:\t\t in the sever set for the target. If the server set has not been\n 204:\t\t modified for the specified time, the most loaded node is removed\n 205:\t\t from the server set, in order to avoid high degree of replication.\n 206:\t\n 207:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 208:\t\t module, choose M here. If unsure, say N.\n 209:\t\n 210:\tconfig\tIP_VS_DH\n 211:\t\ttristate \"destination hashing scheduling\"\n 212:\t\thelp\n 213:\t\t The destination hashing scheduling algorithm assigns network\n 214:\t\t connections to the servers through looking up a statically assigned\n 215:\t\t hash table by their destination IP addresses.\n 216:\t\n 217:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 218:\t\t module, choose M here. If unsure, say N.\n 219:\t\n 220:\tconfig\tIP_VS_SH\n 221:\t\ttristate \"source hashing scheduling\"\n 222:\t\thelp\n 223:\t\t The source hashing scheduling algorithm assigns network\n 224:\t\t connections to the servers through looking up a statically assigned\n 225:\t\t hash table by their source IP addresses.\n 226:\t\n 227:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 228:\t\t module, choose M here. If unsure, say N.\n 229:\t\n 230:\tconfig\tIP_VS_MH\n 231:\t\ttristate \"maglev hashing scheduling\"\n 232:\t\thelp\n 233:\t\t The maglev consistent hashing scheduling algorithm provides the\n 234:\t\t Google's Maglev hashing algorithm as a IPVS scheduler. It assigns\n 235:\t\t network connections to the servers through looking up a statically\n 236:\t\t assigned special hash table called the lookup table. Maglev hashing\n 237:\t\t is to assign a preference list of all the lookup table positions\n 238:\t\t to each destination.\n 239:\t\n 240:\t\t Through this operation, The maglev hashing gives an almost equal\n 241:\t\t share of the lookup table to each of the destinations and provides\n 242:\t\t minimal disruption by using the lookup table. When the set of\n 243:\t\t destinations changes, a connection will likely be sent to the same\n 244:\t\t destination as it was before.\n 245:\t\n 246:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 247:\t\t module, choose M here. If unsure, say N.\n 248:\t\n 249:\tconfig\tIP_VS_SED\n 250:\t\ttristate \"shortest expected delay scheduling\"\n 251:\t\thelp\n 252:\t\t The shortest expected delay scheduling algorithm assigns network\n 253:\t\t connections to the server with the shortest expected delay. The \n 254:\t\t expected delay that the job will experience is (Ci + 1) / Ui if \n 255:\t\t sent to the ith server, in which Ci is the number of connections\n 256:\t\t on the ith server and Ui is the fixed service rate (weight)\n 257:\t\t of the ith server.\n 258:\t\n 259:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 260:\t\t module, choose M here. If unsure, say N.\n 261:\t\n 262:\tconfig\tIP_VS_NQ\n 263:\t\ttristate \"never queue scheduling\"\n 264:\t\thelp\n 265:\t\t The never queue scheduling algorithm adopts a two-speed model.\n 266:\t\t When there is an idle server available, the job will be sent to\n 267:\t\t the idle server, instead of waiting for a fast one. When there\n 268:\t\t is no idle server available, the job will be sent to the server\n 269:\t\t that minimize its expected delay (The Shortest Expected Delay\n 270:\t\t scheduling algorithm).\n 271:\t\n 272:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 273:\t\t module, choose M here. If unsure, say N.\n 274:\t\n 275:\tconfig\tIP_VS_TWOS\n 276:\t\ttristate \"weighted random twos choice least-connection scheduling\"\n 277:\t\thelp\n 278:\t\t The weighted random twos choice least-connection scheduling\n 279:\t\t algorithm picks two random real servers and directs network\n 280:\t\t connections to the server with the least active connections\n 281:\t\t normalized by the server weight.\n 282:\t\n 283:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 284:\t\t module, choose M here. If unsure, say N.\n 285:\t\n 286:\tcomment 'IPVS SH scheduler'\n 287:\t\n 288:\tconfig IP_VS_SH_TAB_BITS\n 289:\t\tint \"IPVS source hashing table size (the Nth power of 2)\"\n 290:\t\trange 4 20\n 291:\t\tdefault 8\n 292:\t\thelp\n 293:\t\t The source hashing scheduler maps source IPs to destinations\n 294:\t\t stored in a hash table. This table is tiled by each destination\n 295:\t\t until all slots in the table are filled. When using weights to\n 296:\t\t allow destinations to receive more connections, the table is\n 297:\t\t tiled an amount proportional to the weights specified. The table\n 298:\t\t needs to be large enough to effectively fit all the destinations\n 299:\t\t multiplied by their respective weights.\n 300:\t\n"
} |
| 17/2 | 2026/07/07 16:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17972 output: 42 thoughts: 1189 Thoughts: **Analyzing the IPVS Configuration and Function Landscape** Okay, so I'm looking at these configurations: `IP_VS`, `IP_VS_RR`, `IP_VS_WRR`, `IP_VS_LC`, `IP_VS_WLC`, `IP_VS_FO`, `IP_VS_OVF`, `IP_VS_LBLC`, `IP_VS_LBLCR`, `IP_VS_DH`, `IP_VS_SH`, `IP_VS_MH`, `IP_VS_SED`, `IP_VS_NQ`, `IP_VS_TWOS`. These are the core features enabled in the IP Virtual Server. Now, I want to see which functions have been modified or are relevant to this area. Alright, the following functions have seen changes across the codebase, particularly in `ip_vs_conn.c`, `ip_vs_core.c`, `ip_vs_ctl.c`, `ip_vs_dh.c`, `ip_vs_fo.c`, `ip_vs_lblc.c`, `ip_vs_lblcr.c`, `ip_vs_lc.c`, `ip_vs_mh.c`, `ip_vs_nq.c`, `ip_vs_ovf.c`, `ip_vs_rr.c`, `ip_vs_sed.c`, `ip_vs_sh.c`, `ip_vs_twos.c`, `ip_vs_wlc.c`, `ip_vs_wrr.c`, and `ip_vs_xmit.c`. These are definitely crucial kernel elements, especially the schedulers. I'll focus on them and some key core functions for further analysis. Specifically, I'm going to flag these as focus symbols: `ip_vs_bind_dest`, `ip_vs_unbind_dest`, `ip_vs_check_template`, `__ip_vs_update_dest`, `__ip_vs_unlink_dest`, the scheduler functions: `ip_vs_dh_schedule`, `ip_vs_fo_schedule`, `ip_vs_lblc_schedule`, `__ip_vs_lblcr_schedule`, `ip_vs_lc_schedule`, `ip_vs_nq_schedule`, `ip_vs_ovf_schedule`, `ip_vs_rr_schedule`, `ip_vs_sed_schedule`, `ip_vs_twos_schedule`, `ip_vs_wlc_schedule`, and `ip_vs_wrr_schedule`. Just to reiterate, the configurations that seem to be pertinent are `IP_VS`, `IP_VS_RR`, `IP_VS_WRR`, `IP_VS_LC`, `IP_VS_WLC`, `IP_VS_FO`, `IP_VS_OVF`, `IP_VS_LBLC`, `IP_VS_LBLCR`, `IP_VS_DH`, `IP_VS_SH`, `IP_VS_MH`, `IP_VS_SED`, `IP_VS_NQ`, and `IP_VS_TWOS`. Wait, quick thought: `ip_vs_in_hook` is a hot path, so I'll probably want to avoid that. Same with `ip_vs_in_stats` and `ip_vs_out_stats`. I should prioritize exploring the other functions, such as `ip_vs_bind_dest`, `ip_vs_unbind_dest`, `__ip_vs_update_dest`, `__ip_vs_unlink_dest`, and the schedulers, of course. Let me double-check about `ip_vs_twos_schedule` specifically. Oh, yes, it's declared `static`. Okay, so since it's reachable, it *could* be fuzzed by syzkaller. However, I usually focus on non-static ones or static ones if they are very well-defined. Ah, right! It's assigned to a struct! Now, let's take a look at `ip_vs_dh_schedule` for further details. |
| 18/2 | 2026/07/07 16:08 | tool | grepper |
0mArgs:{
"Expression": "ip_vs_dh_schedule",
"PathPrefix": "net/netfilter/ipvs/ip_vs_dh.c"
}Results: {
"Output": "net/netfilter/ipvs/ip_vs_dh.c=211=static struct ip_vs_dest *\nnet/netfilter/ipvs/ip_vs_dh.c:212:ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,\nnet/netfilter/ipvs/ip_vs_dh.c-213-\t\t struct ip_vs_iphdr *iph)\n--\nnet/netfilter/ipvs/ip_vs_dh.c-241- */\nnet/netfilter/ipvs/ip_vs_dh.c:242:static struct ip_vs_scheduler ip_vs_dh_scheduler =\nnet/netfilter/ipvs/ip_vs_dh.c-243-{\n--\nnet/netfilter/ipvs/ip_vs_dh.c-246-\t.module =\t\tTHIS_MODULE,\nnet/netfilter/ipvs/ip_vs_dh.c:247:\t.n_list =\t\tLIST_HEAD_INIT(ip_vs_dh_scheduler.n_list),\nnet/netfilter/ipvs/ip_vs_dh.c-248-\t.init_service =\t\tip_vs_dh_init_svc,\n--\nnet/netfilter/ipvs/ip_vs_dh.c-251-\t.del_dest =\t\tip_vs_dh_dest_changed,\nnet/netfilter/ipvs/ip_vs_dh.c:252:\t.schedule =\t\tip_vs_dh_schedule,\nnet/netfilter/ipvs/ip_vs_dh.c-253-};\n--\nnet/netfilter/ipvs/ip_vs_dh.c=256=static int __init ip_vs_dh_init(void)\nnet/netfilter/ipvs/ip_vs_dh.c-257-{\nnet/netfilter/ipvs/ip_vs_dh.c:258:\treturn register_ip_vs_scheduler(\u0026ip_vs_dh_scheduler);\nnet/netfilter/ipvs/ip_vs_dh.c-259-}\n--\nnet/netfilter/ipvs/ip_vs_dh.c=262=static void __exit ip_vs_dh_cleanup(void)\nnet/netfilter/ipvs/ip_vs_dh.c-263-{\nnet/netfilter/ipvs/ip_vs_dh.c:264:\tunregister_ip_vs_scheduler(\u0026ip_vs_dh_scheduler);\nnet/netfilter/ipvs/ip_vs_dh.c-265-\tsynchronize_rcu();\n"
} |
| 19/2 | 2026/07/07 16:08 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 20756 output: 37 thoughts: 219 Thoughts: Here's my take on those scheduling functions, from the perspective of an expert: **Analyzing IPVS Scheduler Configuration** Okay, so I'm looking at these `.schedule` callbacks within the `struct ip_vs_scheduler`. These are the static functions responsible for actually assigning new connections. Seems straightforward – they're the core of the scheduling logic. I'll definitely incorporate these into my FocusSymbols to keep them top-of-mind. Now, let's run through the config options that enable these various scheduling algorithms. We have the usual suspects: `IP_VS`, then `IP_VS_RR`, `IP_VS_WRR`, and the rest – `IP_VS_LC`, `IP_VS_WLC`, `IP_VS_FO`, `IP_VS_OVF`, the LBL family (`IP_VS_LBLC`, `IP_VS_LBLCR`), and the hashing algorithms (`IP_VS_DH`, `IP_VS_SH`, `IP_VS_MH`, `IP_VS_SED`, `IP_VS_NQ`, `IP_VS_TWOS`). Got it. I should also double-check whether there are any other configuration dependencies. Aha, right, `IP_VS_IPV6` comes to mind. That one could be essential for the `__ip_vs_get_out_rt_v6` function – can't forget about IPv6. Need to ensure that's accounted for appropriately. |
| 20/2 | 2026/07/07 16:08 | tool | grepper |
0mError:no matches Args: {
"Expression": "config IP_VS_IPV6",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"error": "no matches"
} |
| 21/2 | 2026/07/07 16:08 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21344 output: 36 thoughts: 19 Thoughts: Here's my thought process, summarized as you requested: **Kconfig Musings** Okay, now let me see... I was just looking through that Kconfig file, and something just clicked. It was that `IP_VS_IPV6` symbol. Seeing that triggered a memory and a potential connection. Now I have to think, *why* did that jump out? What does it imply in relation to the problem I'm working on? It's time to follow that breadcrumb and see if it leads anywhere useful. |
| 22/2 | 2026/07/07 16:08 | tool | grepper |
0mArgs:{
"Expression": "IP_VS_IPV6",
"PathPrefix": "net/netfilter/ipvs/Kconfig"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig=27=if IP_VS\nnet/netfilter/ipvs/Kconfig-28-\nnet/netfilter/ipvs/Kconfig:29:config\tIP_VS_IPV6\nnet/netfilter/ipvs/Kconfig-30-\tbool \"IPv6 support for IPVS\"\n"
} |
| 23/2 | 2026/07/07 16:08 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21605 output: 474 thoughts: 982 Thoughts: **Analyzing IPVS Destination Flag Updates for Fuzzing** Okay, so I'm looking at this patch and immediately notice the change from `volatile unsigned int` to `atomic_t` for the `flags` field in `struct ip_vs_dest`. Right away, this means we're dealing with a fundamental shift in how destination flags are handled for read and write operations, and it's a critical change related to concurrency and thread-safety. This touches the core reachable logic of the IPVS, the connection management within it, and, importantly, all of the schedulers. My focus needs to be on ensuring the consistency and correctness of this transition. First, I identified `IP_VS_IPV6` as a configuration option, since it's listed after the `config`. I'm going to pull out the function symbols that are going to need more scrutiny in my fuzzing campaign. I need a list of the FocusSymbols. I am considering these functions: * `ip_vs_bind_dest` * `ip_vs_unbind_dest` * `ip_vs_check_template` * `__ip_vs_update_dest` * `__ip_vs_unlink_dest` * `ip_vs_dh_schedule` * `ip_vs_fo_schedule` * `ip_vs_lblc_schedule` * `__ip_vs_lblcr_schedule` * `ip_vs_lc_schedule` * `ip_vs_nq_schedule` * `ip_vs_ovf_schedule` * `ip_vs_rr_schedule` * `ip_vs_sed_schedule` * `ip_vs_twos_schedule` * `ip_vs_wlc_schedule` * `ip_vs_wrr_schedule` * `ip_vs_expire_nodest_conn_flush` I also added: * `__ip_vs_get_out_rt` * `__ip_vs_get_out_rt_v6` Since they are the hot paths when transmitting packets, I'll include them. The schedulers and destination management functions should be included. I also have identified the configuration options in the system: * `IP_VS` * `IP_VS_IPV6` * `IP_VS_RR` * `IP_VS_WRR` * `IP_VS_LC` * `IP_VS_WLC` * `IP_VS_FO` * `IP_VS_OVF` * `IP_VS_LBLC` * `IP_VS_LBLCR` * `IP_VS_DH` * `IP_VS_SH` * `IP_VS_MH` * `IP_VS_SED` * `IP_VS_NQ` * `IP_VS_TWOS` My analysis is that because this patch is changing the destination flags to be atomic operations, this is a core change and the update to the core reachable logic needs to be verified. My fuzzing campaign will focus on hitting these functions with a variety of traffic patterns and configurations, paying close attention to any race conditions or regressions that might arise from this change. It's a functional change related to a thread-safe update, and it needs proper fuzzing. Now, I'm ready to call `set-results`. |
| 24/2 | 2026/07/07 16:08 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_RR",
"IP_VS_WRR",
"IP_VS_LC",
"IP_VS_WLC",
"IP_VS_FO",
"IP_VS_OVF",
"IP_VS_LBLC",
"IP_VS_LBLCR",
"IP_VS_DH",
"IP_VS_SH",
"IP_VS_MH",
"IP_VS_SED",
"IP_VS_NQ",
"IP_VS_TWOS"
],
"FocusSymbols": [
"ip_vs_bind_dest",
"ip_vs_unbind_dest",
"ip_vs_check_template",
"__ip_vs_update_dest",
"__ip_vs_unlink_dest",
"ip_vs_expire_nodest_conn_flush",
"ip_vs_dh_schedule",
"ip_vs_fo_schedule",
"ip_vs_lblc_schedule",
"__ip_vs_lblcr_schedule",
"ip_vs_lc_schedule",
"ip_vs_nq_schedule",
"ip_vs_ovf_schedule",
"ip_vs_rr_schedule",
"ip_vs_sed_schedule",
"ip_vs_twos_schedule",
"ip_vs_wlc_schedule",
"ip_vs_wrr_schedule"
],
"Reasoning": "The patch changes the `flags` field in `struct ip_vs_dest` to use atomic operations (`atomic_t`) instead of a `volatile unsigned int`. This affects how destination flags (like `IP_VS_DEST_F_AVAILABLE` and `IP_VS_DEST_F_OVERLOAD`) are read and updated across the IPVS core, connection management, and all IPVS schedulers. This is a functional change to core reachable logic, making it thread-safe, and should be fuzzed to ensure no regressions or race conditions occur.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_RR",
"IP_VS_WRR",
"IP_VS_LC",
"IP_VS_WLC",
"IP_VS_FO",
"IP_VS_OVF",
"IP_VS_LBLC",
"IP_VS_LBLCR",
"IP_VS_DH",
"IP_VS_SH",
"IP_VS_MH",
"IP_VS_SED",
"IP_VS_NQ",
"IP_VS_TWOS"
],
"FocusSymbols": [
"ip_vs_bind_dest",
"ip_vs_unbind_dest",
"ip_vs_check_template",
"__ip_vs_update_dest",
"__ip_vs_unlink_dest",
"ip_vs_expire_nodest_conn_flush",
"ip_vs_dh_schedule",
"ip_vs_fo_schedule",
"ip_vs_lblc_schedule",
"__ip_vs_lblcr_schedule",
"ip_vs_lc_schedule",
"ip_vs_nq_schedule",
"ip_vs_ovf_schedule",
"ip_vs_rr_schedule",
"ip_vs_sed_schedule",
"ip_vs_twos_schedule",
"ip_vs_wlc_schedule",
"ip_vs_wrr_schedule"
],
"Reasoning": "The patch changes the `flags` field in `struct ip_vs_dest` to use atomic operations (`atomic_t`) instead of a `volatile unsigned int`. This affects how destination flags (like `IP_VS_DEST_F_AVAILABLE` and `IP_VS_DEST_F_OVERLOAD`) are read and updated across the IPVS core, connection management, and all IPVS schedulers. This is a functional change to core reachable logic, making it thread-safe, and should be fuzzed to ensure no regressions or race conditions occur.",
"WorthFuzzing": true
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|