======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.1595/9760 is trying to acquire lock:
ffff88816e4e1cd8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_dumpreset_rules+0x72/0xa0

but task is already holding lock:
ffff88811c5ac6f0 (nlk_cb_mutex-NETFILTER){+.+.}-{4:4}, at: __netlink_dump_start+0xf4/0x7b0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (nlk_cb_mutex-NETFILTER){+.+.}-{4:4}:
       __mutex_lock+0x199/0x12d0
       __netlink_dump_start+0xf4/0x7b0
       ip_set_dump+0x15b/0x1f0
       nfnetlink_rcv_msg+0xcbf/0x12a0
       netlink_rcv_skb+0x226/0x4a0
       nfnetlink_rcv+0x2b9/0x28c0
       netlink_unicast+0x833/0x9f0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0xa67/0xad0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0xf0/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (nfnl_subsys_ipset){+.+.}-{4:4}:
       __mutex_lock+0x199/0x12d0
       ip_set_nfnl_get_byindex+0x67/0x230
       set_match_v1_checkentry+0x71/0x230
       xt_check_match+0x425/0xaf0
       __nft_match_init+0x686/0x8d0
       nf_tables_newrule+0x179a/0x28c0
       nfnetlink_rcv+0x128a/0x28c0
       netlink_unicast+0x833/0x9f0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0xa67/0xad0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0xf0/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&nft_net->commit_mutex){+.+.}-{4:4}:
       __lock_acquire+0x1520/0x2cd0
       lock_acquire+0x116/0x340
       __mutex_lock+0x199/0x12d0
       nf_tables_dumpreset_rules+0x72/0xa0
       netlink_dump+0x727/0xf30
       __netlink_dump_start+0x589/0x7b0
       nft_netlink_dump_start_rcu+0xdb/0x1a0
       nf_tables_getrule_reset+0x1e0/0x620
       nfnetlink_rcv_msg+0x8a6/0x12a0
       netlink_rcv_skb+0x226/0x4a0
       nfnetlink_rcv+0x2b9/0x28c0
       netlink_unicast+0x833/0x9f0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0xa67/0xad0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0xf0/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &nft_net->commit_mutex --> nfnl_subsys_ipset --> nlk_cb_mutex-NETFILTER

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(nlk_cb_mutex-NETFILTER);
                               lock(nfnl_subsys_ipset);
                               lock(nlk_cb_mutex-NETFILTER);
  lock(&nft_net->commit_mutex);

 *** DEADLOCK ***

1 lock held by syz.0.1595/9760:
 #0: ffff88811c5ac6f0 (nlk_cb_mutex-NETFILTER){+.+.}-{4:4}, at: __netlink_dump_start+0xf4/0x7b0

stack backtrace:
CPU: 0 UID: 0 PID: 9760 Comm: syz.0.1595 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x1a9/0x280
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x1520/0x2cd0
 lock_acquire+0x116/0x340
 __mutex_lock+0x199/0x12d0
 nf_tables_dumpreset_rules+0x72/0xa0
 netlink_dump+0x727/0xf30
 __netlink_dump_start+0x589/0x7b0
 nft_netlink_dump_start_rcu+0xdb/0x1a0
 nf_tables_getrule_reset+0x1e0/0x620
 nfnetlink_rcv_msg+0x8a6/0x12a0
 netlink_rcv_skb+0x226/0x4a0
 nfnetlink_rcv+0x2b9/0x28c0
 netlink_unicast+0x833/0x9f0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0xa67/0xad0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a6a19ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0a6b0de028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0a6a415fa0 RCX: 00007f0a6a19ce59
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007f0a6a232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a6a416038 R14: 00007f0a6a415fa0 R15: 00007ffe5be20ae8
 </TASK>
