AI Trajectory

null

{
  "EnableConfigs": [
    "NET_9P",
    "NET_9P_FD",
    "9P_FS"
  ],
  "FocusSymbols": [
    "p9_client_abort",
    "p9_read_work",
    "p9_client_rpc",
    "p9_client_zc_rpc"
  ],
  "Reasoning": "The patch modifies the 9p client and transport code to handle fatal signals by aborting requests instead of waiting for TFLUSH. It introduces a new request status REQ_STATUS_ABORTED and modifies p9_client_rpc, p9_client_zc_rpc, and p9_read_work to handle it. This is a functional change in the core 9p client logic and should be fuzzed.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 404d88238a391cc09a332f60f14a573e1175f450\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jul 16 12:00:11 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/net/9p/client.h b/include/net/9p/client.h\nindex 55c6cb54bd2548..700dcb37c1dc40 100644\n--- a/include/net/9p/client.h\n+++ b/include/net/9p/client.h\n@@ -58,6 +58,8 @@ enum p9_trans_status {\n  * @REQ_STATUS_UNSENT: request waiting to be sent\n  * @REQ_STATUS_SENT: request sent to server\n  * @REQ_STATUS_RCVD: response received from server\n+ * @REQ_STATUS_ABORTED: caller stopped waiting, but the request keeps its tag\n+ *                      reserved until a reply arrives or the transport closes\n  * @REQ_STATUS_FLSHD: request has been flushed\n  * @REQ_STATUS_ERROR: request encountered an error on the client side\n  */\n@@ -67,6 +69,7 @@ enum p9_req_status_t {\n \tREQ_STATUS_UNSENT,\n \tREQ_STATUS_SENT,\n \tREQ_STATUS_RCVD,\n+\tREQ_STATUS_ABORTED,\n \tREQ_STATUS_FLSHD,\n \tREQ_STATUS_ERROR,\n };\ndiff --git a/include/net/9p/transport.h b/include/net/9p/transport.h\nindex a912bbaa862f9b..93349fe33dff40 100644\n--- a/include/net/9p/transport.h\n+++ b/include/net/9p/transport.h\n@@ -34,6 +34,9 @@\n  * @supports_vmalloc: set if this transport can work with vmalloc'd buffers\n  *                    (non-physically contiguous memory). Transports requiring\n  *                    DMA should leave this as false.\n+ * @supports_async_abort: set if a sent request remains referenced by the\n+ *                        transport until its reply is consumed or the\n+ *                        transport is closed\n  * @create: member function to create a new connection on this transport\n  * @close: member function to discard a connection on this transport\n  * @request: member function to issue a request to the transport\n@@ -55,6 +58,7 @@ struct p9_trans_module {\n \tbool pooled_rbuffers;\n \tbool def;\t\t/* this transport should be default */\n \tbool supports_vmalloc;\t/* can work with vmalloc'd buffers */\n+\tbool supports_async_abort; /* keeps sent requests alive after caller exits */\n \tstruct module *owner;\n \tint (*create)(struct p9_client *client,\n \t\t      struct fs_context *fc);\ndiff --git a/net/9p/client.c b/net/9p/client.c\nindex ef64546c6d52a1..47353cf0750ddf 100644\n--- a/net/9p/client.c\n+++ b/net/9p/client.c\n@@ -538,6 +538,22 @@ static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,\n \treturn ERR_PTR(err);\n }\n \n+static void p9_client_abort(struct p9_client *c, struct p9_req_t *req)\n+{\n+\t/*\n+\t * A fatal signal cannot wait for TFLUSH, but a sent request must keep\n+\t * its tag until a late reply arrives or the transport is torn down.\n+\t */\n+\tif (!c-\u003etrans_mod-\u003esupports_async_abort ||\n+\t    READ_ONCE(req-\u003estatus) \u003e= REQ_STATUS_RCVD)\n+\t\treturn;\n+\n+\tif (!c-\u003etrans_mod-\u003ecancel(c, req))\n+\t\treturn;\n+\n+\tcmpxchg(\u0026req-\u003estatus, REQ_STATUS_SENT, REQ_STATUS_ABORTED);\n+}\n+\n /**\n  * p9_client_rpc - issue a request and wait for a response\n  * @c: client session\n@@ -612,6 +628,20 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)\n \t\terr = req-\u003et_err;\n \t}\n \tif (err == -ERESTARTSYS \u0026\u0026 c-\u003estatus == Connected) {\n+\t\tif (READ_ONCE(req-\u003estatus) == REQ_STATUS_RCVD) {\n+\t\t\terr = 0;\n+\t\t\tgoto recalc_sigpending;\n+\t\t}\n+\n+\t\tif (fatal_signal_pending(current) \u0026\u0026\n+\t\t    c-\u003etrans_mod-\u003esupports_async_abort) {\n+\t\t\tp9_debug(P9_DEBUG_MUX, \"fatal signal: skip flush\\n\");\n+\t\t\tp9_client_abort(c, req);\n+\t\t\tif (READ_ONCE(req-\u003estatus) == REQ_STATUS_RCVD)\n+\t\t\t\terr = 0;\n+\t\t\tgoto recalc_sigpending;\n+\t\t}\n+\n \t\tp9_debug(P9_DEBUG_MUX, \"flushing\\n\");\n \t\tsigpending = 1;\n \t\tclear_thread_flag(TIF_SIGPENDING);\n@@ -697,6 +727,11 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,\n \t\terr = req-\u003et_err;\n \t}\n \tif (err == -ERESTARTSYS \u0026\u0026 c-\u003estatus == Connected) {\n+\t\tif (READ_ONCE(req-\u003estatus) == REQ_STATUS_RCVD) {\n+\t\t\terr = 0;\n+\t\t\tgoto recalc_sigpending;\n+\t\t}\n+\n \t\tp9_debug(P9_DEBUG_MUX, \"flushing\\n\");\n \t\tsigpending = 1;\n \t\tclear_thread_flag(TIF_SIGPENDING);\ndiff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c\nindex eb685b52aeb264..d5cff8c2c88cdc 100644\n--- a/net/9p/trans_fd.c\n+++ b/net/9p/trans_fd.c\n@@ -293,7 +293,9 @@ static void p9_read_work(struct work_struct *work)\n \t\t\t m, m-\u003erc.size, m-\u003erc.tag);\n \n \t\tm-\u003erreq = p9_tag_lookup(m-\u003eclient, m-\u003erc.tag);\n-\t\tif (!m-\u003erreq || (m-\u003erreq-\u003estatus != REQ_STATUS_SENT)) {\n+\t\tif (!m-\u003erreq ||\n+\t\t    (m-\u003erreq-\u003estatus != REQ_STATUS_SENT \u0026\u0026\n+\t\t     m-\u003erreq-\u003estatus != REQ_STATUS_ABORTED)) {\n \t\t\tp9_debug(P9_DEBUG_ERROR, \"Unexpected packet tag %d\\n\",\n \t\t\t\t m-\u003erc.tag);\n \t\t\terr = -EIO;\n@@ -332,6 +334,9 @@ static void p9_read_work(struct work_struct *work)\n \t\tif (m-\u003erreq-\u003estatus == REQ_STATUS_SENT) {\n \t\t\tlist_del(\u0026m-\u003erreq-\u003ereq_list);\n \t\t\tp9_client_cb(m-\u003eclient, m-\u003erreq, REQ_STATUS_RCVD);\n+\t\t} else if (m-\u003erreq-\u003estatus == REQ_STATUS_ABORTED) {\n+\t\t\tlist_del(\u0026m-\u003erreq-\u003ereq_list);\n+\t\t\tp9_client_cb(m-\u003eclient, m-\u003erreq, REQ_STATUS_ABORTED);\n \t\t} else if (m-\u003erreq-\u003estatus == REQ_STATUS_FLSHD) {\n \t\t\t/* Ignore replies associated with a cancelled request. */\n \t\t\tp9_debug(P9_DEBUG_TRANS,\n@@ -996,6 +1001,7 @@ static struct p9_trans_module p9_tcp_trans = {\n \t.pooled_rbuffers = false,\n \t.def = false,\n \t.supports_vmalloc = true,\n+\t.supports_async_abort = true,\n \t.create = p9_fd_create_tcp,\n \t.close = p9_fd_close,\n \t.request = p9_fd_request,\n@@ -1011,6 +1017,7 @@ static struct p9_trans_module p9_unix_trans = {\n \t.maxsize = MAX_SOCK_BUF,\n \t.def = false,\n \t.supports_vmalloc = true,\n+\t.supports_async_abort = true,\n \t.create = p9_fd_create_unix,\n \t.close = p9_fd_close,\n \t.request = p9_fd_request,\n@@ -1026,6 +1033,7 @@ static struct p9_trans_module p9_fd_trans = {\n \t.maxsize = MAX_SOCK_BUF,\n \t.def = false,\n \t.supports_vmalloc = true,\n+\t.supports_async_abort = true,\n \t.create = p9_fd_create,\n \t.close = p9_fd_close,\n \t.request = p9_fd_request,\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "NET_9P",
    "NET_9P_FD",
    "9P_FS"
  ],
  "FocusSymbols": [
    "p9_client_abort",
    "p9_read_work",
    "p9_client_rpc",
    "p9_client_zc_rpc"
  ],
  "Reasoning": "The patch modifies the 9p client and transport code to handle fatal signals by aborting requests instead of waiting for TFLUSH. It introduces a new request status REQ_STATUS_ABORTED and modifies p9_client_rpc, p9_client_zc_rpc, and p9_read_work to handle it. This is a functional change in the core 9p client logic and should be fuzzed.",
  "WorthFuzzing": true
}

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.

For your convenience, here is the diff of the changes:
commit 404d88238a391cc09a332f60f14a573e1175f450
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jul 16 12:00:11 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 55c6cb54bd2548..700dcb37c1dc40 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -58,6 +58,8 @@ enum p9_trans_status {
  * @REQ_STATUS_UNSENT: request waiting to be sent
  * @REQ_STATUS_SENT: request sent to server
  * @REQ_STATUS_RCVD: response received from server
+ * @REQ_STATUS_ABORTED: caller stopped waiting, but the request keeps its tag
+ *                      reserved until a reply arrives or the transport closes
  * @REQ_STATUS_FLSHD: request has been flushed
  * @REQ_STATUS_ERROR: request encountered an error on the client side
  */
@@ -67,6 +69,7 @@ enum p9_req_status_t {
 	REQ_STATUS_UNSENT,
 	REQ_STATUS_SENT,
 	REQ_STATUS_RCVD,
+	REQ_STATUS_ABORTED,
 	REQ_STATUS_FLSHD,
 	REQ_STATUS_ERROR,
 };
diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h
index a912bbaa862f9b..93349fe33dff40 100644
--- a/include/net/9p/transport.h
+++ b/include/net/9p/transport.h
@@ -34,6 +34,9 @@
  * @supports_vmalloc: set if this transport can work with vmalloc'd buffers
  *                    (non-physically contiguous memory). Transports requiring
  *                    DMA should leave this as false.
+ * @supports_async_abort: set if a sent request remains referenced by the
+ *                        transport until its reply is consumed or the
+ *                        transport is closed
  * @create: member function to create a new connection on this transport
  * @close: member function to discard a connection on this transport
  * @request: member function to issue a request to the transport
@@ -55,6 +58,7 @@ struct p9_trans_module {
 	bool pooled_rbuffers;
 	bool def;		/* this transport should be default */
 	bool supports_vmalloc;	/* can work with vmalloc'd buffers */
+	bool supports_async_abort; /* keeps sent requests alive after caller exits */
 	struct module *owner;
 	int (*create)(struct p9_client *client,
 		      struct fs_context *fc);
diff --git a/net/9p/client.c b/net/9p/client.c
index ef64546c6d52a1..47353cf0750ddf 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -538,6 +538,22 @@ static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
 	return ERR_PTR(err);
 }
 
+static void p9_client_abort(struct p9_client *c, struct p9_req_t *req)
+{
+	/*
+	 * A fatal signal cannot wait for TFLUSH, but a sent request must keep
+	 * its tag until a late reply arrives or the transport is torn down.
+	 */
+	if (!c->trans_mod->supports_async_abort ||
+	    READ_ONCE(req->status) >= REQ_STATUS_RCVD)
+		return;
+
+	if (!c->trans_mod->cancel(c, req))
+		return;
+
+	cmpxchg(&req->status, REQ_STATUS_SENT, REQ_STATUS_ABORTED);
+}
+
 /**
  * p9_client_rpc - issue a request and wait for a response
  * @c: client session
@@ -612,6 +628,20 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 		err = req->t_err;
 	}
 	if (err == -ERESTARTSYS && c->status == Connected) {
+		if (READ_ONCE(req->status) == REQ_STATUS_RCVD) {
+			err = 0;
+			goto recalc_sigpending;
+		}
+
+		if (fatal_signal_pending(current) &&
+		    c->trans_mod->supports_async_abort) {
+			p9_debug(P9_DEBUG_MUX, "fatal signal: skip flush\n");
+			p9_client_abort(c, req);
+			if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
+				err = 0;
+			goto recalc_sigpending;
+		}
+
 		p9_debug(P9_DEBUG_MUX, "flushing\n");
 		sigpending = 1;
 		clear_thread_flag(TIF_SIGPENDING);
@@ -697,6 +727,11 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
 		err = req->t_err;
 	}
 	if (err == -ERESTARTSYS && c->status == Connected) {
+		if (READ_ONCE(req->status) == REQ_STATUS_RCVD) {
+			err = 0;
+			goto recalc_sigpending;
+		}
+
 		p9_debug(P9_DEBUG_MUX, "flushing\n");
 		sigpending = 1;
 		clear_thread_flag(TIF_SIGPENDING);
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index eb685b52aeb264..d5cff8c2c88cdc 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -293,7 +293,9 @@ static void p9_read_work(struct work_struct *work)
 			 m, m->rc.size, m->rc.tag);
 
 		m->rreq = p9_tag_lookup(m->client, m->rc.tag);
-		if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) {
+		if (!m->rreq ||
+		    (m->rreq->status != REQ_STATUS_SENT &&
+		     m->rreq->status != REQ_STATUS_ABORTED)) {
 			p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
 				 m->rc.tag);
 			err = -EIO;
@@ -332,6 +334,9 @@ static void p9_read_work(struct work_struct *work)
 		if (m->rreq->status == REQ_STATUS_SENT) {
 			list_del(&m->rreq->req_list);
 			p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD);
+		} else if (m->rreq->status == REQ_STATUS_ABORTED) {
+			list_del(&m->rreq->req_list);
+			p9_client_cb(m->client, m->rreq, REQ_STATUS_ABORTED);
 		} else if (m->rreq->status == REQ_STATUS_FLSHD) {
 			/* Ignore replies associated with a cancelled request. */
 			p9_debug(P9_DEBUG_TRANS,
@@ -996,6 +1001,7 @@ static struct p9_trans_module p9_tcp_trans = {
 	.pooled_rbuffers = false,
 	.def = false,
 	.supports_vmalloc = true,
+	.supports_async_abort = true,
 	.create = p9_fd_create_tcp,
 	.close = p9_fd_close,
 	.request = p9_fd_request,
@@ -1011,6 +1017,7 @@ static struct p9_trans_module p9_unix_trans = {
 	.maxsize = MAX_SOCK_BUF,
 	.def = false,
 	.supports_vmalloc = true,
+	.supports_async_abort = true,
 	.create = p9_fd_create_unix,
 	.close = p9_fd_close,
 	.request = p9_fd_request,
@@ -1026,6 +1033,7 @@ static struct p9_trans_module p9_fd_trans = {
 	.maxsize = MAX_SOCK_BUF,
 	.def = false,
 	.supports_vmalloc = true,
+	.supports_async_abort = true,
 	.create = p9_fd_create,
 	.close = p9_fd_close,
 	.request = p9_fd_request,

gemini-3.1-pro-preview

null

null

							input: 3947
							output: 32
							thoughts: 243
						

**My Assessment of the 9p Client Patch**

Okay, so we have a patch here that's making some pretty significant changes to the 9p client and its transport code. The core of it seems to be about improving how we handle asynchronous request abortion. It looks like they're introducing a new request status, `REQ_STATUS_ABORTED`, and adding `supports_async_abort` to the `p9_trans_module`.

Essentially, the patch alters `p9_client_rpc` and `p9_client_zc_rpc` to deal with fatal signals (likely from timeouts or other system-level issues) by aborting the requests directly instead of hanging around waiting for a `TFLUSH`. This is much cleaner. I see it also modifies the `p9_read_work` function in `net/9p/trans_fd.c` to handle this new `REQ_STATUS_ABORTED` properly. That is the final piece of the logic.

It then sets `supports_async_abort = true` for the core transports – `p9_tcp_trans`, `p9_unix_trans`, and `p9_fd_trans`. This makes sense, as these are the primary transport mechanisms.

This is a functional change. Any 9p filesystem mount is likely to touch this code. That immediately makes me think, "fuzzing". The patch seems like a good target for some fuzzing campaigns.

Let me take a quick look at the Kconfig options to determine if these changes can be controlled. Based on my existing knowledge, I expect the relevant options to be: `CONFIG_NET_9P`, `CONFIG_NET_9P_FD`, and `CONFIG_9P_FS`. I'll use `grepper` to be absolutely sure.

{
  "Expression": "config NET_9P",
  "PathPrefix": "net/9p/Kconfig"
}

{
  "Output": "net/9p/Kconfig-5-\nnet/9p/Kconfig:6:menuconfig NET_9P\nnet/9p/Kconfig-7-\ttristate \"Plan 9 Resource Sharing Support (9P2000)\"\n--\nnet/9p/Kconfig=17=if NET_9P\nnet/9p/Kconfig-18-\nnet/9p/Kconfig:19:config NET_9P_FD\nnet/9p/Kconfig-20-\tdefault NET_9P\n--\nnet/9p/Kconfig-27-\nnet/9p/Kconfig:28:config NET_9P_VIRTIO\nnet/9p/Kconfig-29-\tdepends on VIRTIO\n--\nnet/9p/Kconfig-34-\nnet/9p/Kconfig:35:config NET_9P_XEN\nnet/9p/Kconfig-36-\tdepends on XEN\n--\nnet/9p/Kconfig-42-\nnet/9p/Kconfig:43:config NET_9P_USBG\nnet/9p/Kconfig-44-\ttristate \"9P USB Gadget Transport\"\n--\nnet/9p/Kconfig-51-\nnet/9p/Kconfig:52:config NET_9P_RDMA\nnet/9p/Kconfig-53-\tdepends on INET \u0026\u0026 INFINIBAND \u0026\u0026 INFINIBAND_ADDR_TRANS\n--\nnet/9p/Kconfig-57-\nnet/9p/Kconfig:58:config NET_9P_DEBUG\nnet/9p/Kconfig-59-\tbool \"Debug information\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 5022
							output: 33
							thoughts: 45
						

Okay, here's my take on those config options, thinking through this like I would:

**Digging into the 9P Network File System Configuration**

Alright, so I'm dealing with the 9P network file system and need to quickly figure out the essential configuration options. Right off the bat, I know that `NET_9P` and `NET_9P_FD` are going to be key. `NET_9P` is probably the core 9P functionality, likely enabling the general network protocol support. And, I'm betting that `NET_9P_FD` has to do with using file descriptors, maybe for performance or more direct interaction. I really need to verify that and see how they interplay.

I also remember, of course, that there's `9P_FS`, which is probably the actual filesystem module for the 9P protocol. I mean, it is the standard for 9P after all. It's time to drill down and check the kernel configuration file (`fs/9p/Kconfig`) to confirm my assumptions and get the full picture. Let's see what the dependencies and relationships are between these options.

{
  "Expression": "config 9P_FS",
  "PathPrefix": "fs/9p/Kconfig"
}

{
  "Output": "fs/9p/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nfs/9p/Kconfig:2:config 9P_FS\nfs/9p/Kconfig-3-\ttristate \"Plan 9 Resource Sharing Support (9P2000)\"\n--\nfs/9p/Kconfig=14=if 9P_FS\nfs/9p/Kconfig:15:config 9P_FSCACHE\nfs/9p/Kconfig-16-\tbool \"Enable 9P client caching support\"\n--\nfs/9p/Kconfig-22-\nfs/9p/Kconfig:23:config 9P_FS_POSIX_ACL\nfs/9p/Kconfig-24-\tbool \"9P POSIX Access Control Lists\"\n--\nfs/9p/Kconfig=32=endif\n--\nfs/9p/Kconfig-34-\nfs/9p/Kconfig:35:config 9P_FS_SECURITY\nfs/9p/Kconfig-36-\tbool \"9P Security Labels\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 5621
							output: 34
							thoughts: 202
						

**Analyzing the 9P Client Patch**

Okay, so we're looking at modifications related to `NET_9P`, `NET_9P_FD`, and `9P_FS`. My focus needs to be on the key functions impacted by this patch. Let's see... the patch specifically touches `p9_client_prepare_req` which I recognize is handling the context, and also introduces a new function, `p9_client_abort`.  There are also changes to `p9_client_rpc`, `p9_client_zc_rpc`, and `p9_read_work`.

Now, I need to understand the scope and visibility of these functions. Is `p9_client_abort` static? Yes, it appears to be. That's important for understanding its scope within the module. Good. `p9_client_rpc` and `p9_client_zc_rpc` are either exported or, at the very least, globally accessible; which is to be expected for core RPC functions. And `p9_read_work`, that's static, it resides within `net/9p/trans_fd.c`.

I'll check `net/9p/client.c` to confirm that `p9_client_abort` is, indeed, static, just to be absolutely certain of its scope and usage. It is always good to have a high degree of confidence.

{
  "Expression": "p9_client_abort",
  "PathPrefix": "net/9p/client.c"
}

{
  "Output": "net/9p/client.c=502=static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,\n--\nnet/9p/client.c-540-\nnet/9p/client.c:541:static void p9_client_abort(struct p9_client *c, struct p9_req_t *req)\nnet/9p/client.c-542-{\n--\nnet/9p/client.c=567=p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)\n--\nnet/9p/client.c-638-\t\t\tp9_debug(P9_DEBUG_MUX, \"fatal signal: skip flush\\n\");\nnet/9p/client.c:639:\t\t\tp9_client_abort(c, req);\nnet/9p/client.c-640-\t\t\tif (READ_ONCE(req-\u003estatus) == REQ_STATUS_RCVD)\n"
}

gemini-3.1-pro-preview

null

null

							input: 6427
							output: 36
							thoughts: 175
						

**Analyzing Potential Root Causes**

Okay, so I'm thinking about this `p9_client_abort` issue. It's static, so that's probably not the direct culprit. We need to look deeper. My initial assessment is that `p9_client_rpc` and `p9_client_zc_rpc` are strong possibilities, and I'm adding `p9_read_work` to the list. I'm operating on the assumption that this likely has something to do with the RPC flow, since that is, for all intents and purposes, the heart of the 9p protocol interaction.

Let's quickly confirm if `p9_client_rpc` is a hot path. It's the primary RPC function, called for almost every 9p operation, so it's probably heavily used. But the core of the issue seems related to a pending fatal signal, which is intriguing. Fuzzing `p9_client_rpc` and `p9_client_zc_rpc` sounds like a reasonable approach given the signal-related nature of this bug.

Moreover, `p9_read_work` is crucial as it handles the replies. We definitely need to check that out, especially in `net/9p/trans_fd.c`. So let's focus on that area for now.

{
  "Expression": "p9_read_work",
  "PathPrefix": "net/9p/trans_fd.c"
}

{
  "Output": "net/9p/trans_fd.c=216=static int p9_fd_read(struct p9_client *client, void *v, int len)\n--\nnet/9p/trans_fd.c-238-/**\nnet/9p/trans_fd.c:239: * p9_read_work - called when there is some data to be read from a transport\nnet/9p/trans_fd.c-240- * @work: container of work to be done\n--\nnet/9p/trans_fd.c-243-\nnet/9p/trans_fd.c:244:static void p9_read_work(struct work_struct *work)\nnet/9p/trans_fd.c-245-{\n--\nnet/9p/trans_fd.c=554=static void p9_conn_create(struct p9_client *client)\n--\nnet/9p/trans_fd.c-567-\tINIT_LIST_HEAD(\u0026m-\u003eunsent_req_list);\nnet/9p/trans_fd.c:568:\tINIT_WORK(\u0026m-\u003erq, p9_read_work);\nnet/9p/trans_fd.c-569-\tINIT_WORK(\u0026m-\u003ewq, p9_write_work);\n"
}

gemini-3.1-pro-preview

null

null

							input: 7254
							output: 26
							thoughts: 127
						

**Analyzing Potential Fuzzing Targets**

Okay, so I'm looking at these functions within the context of fuzzing, specifically with syzkaller. The immediate thought is that `p9_read_work` is static, which is worth noting. The main candidates for targets appear to be `p9_client_rpc`, `p9_client_zc_rpc`, and `p9_read_work`.

Since `p9_client_abort` is also static, and syzkaller *can* sometimes target static functions, especially if the debug info is present, it's worth considering. The crucial point here is uniqueness; if the static function name is unique, then syzkaller should be able to identify it even if it's static. `p9_client_abort` seems like a potential target if it *is* unique.

So, the next step is definitely to verify whether or not `p9_client_abort`'s name is actually unique within the scope of the program. I need to double-check that.

{
  "Expression": "p9_client_abort",
  "PathPrefix": ""
}

{
  "Output": "net/9p/client.c=502=static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,\n--\nnet/9p/client.c-540-\nnet/9p/client.c:541:static void p9_client_abort(struct p9_client *c, struct p9_req_t *req)\nnet/9p/client.c-542-{\n--\nnet/9p/client.c=567=p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)\n--\nnet/9p/client.c-638-\t\t\tp9_debug(P9_DEBUG_MUX, \"fatal signal: skip flush\\n\");\nnet/9p/client.c:639:\t\t\tp9_client_abort(c, req);\nnet/9p/client.c-640-\t\t\tif (READ_ONCE(req-\u003estatus) == REQ_STATUS_RCVD)\n"
}

gemini-3.1-pro-preview

null

null

							input: 7895
							output: 180
							thoughts: 307
						

**My Assessment of the 9p Client Patch**

Okay, this patch is definitely unique; it's not something I've seen before. Let me see... I need to make sure the relevant configs are enabled: `NET_9P`, `NET_9P_FD`, and `9P_FS`.

The core of this change seems to be around how the 9p client and transport code handles fatal signals. It's essentially aborting requests, rather than getting stuck waiting for a `TFLUSH`. That's interesting, and quite a functional change to the base client logic. The introduction of `REQ_STATUS_ABORTED` is the key, and functions like `p9_client_rpc`, `p9_client_zc_rpc`, and `p9_read_work` are all modified to account for it. This really calls for fuzzing.

My primary focus for fuzzing will be on the functions: `p9_client_abort`, `p9_client_rpc`, `p9_client_zc_rpc`, and `p9_read_work`. Wait a minute, `p9_client_rpc` and `p9_client_zc_rpc` are the primary hot paths for 9p client interaction. They are the main entry points for fuzzer interaction. `p9_client_abort` is the function *actually* handling the abort logic specifically, and `p9_read_work` is the reply handler, so I need to make sure to include those too. I'll make sure to get `p9_client_abort` and `p9_read_work` on the list.

Now, let me just confirm that `p9_client_abort` is the *only* newly added function. Yep, that's the only one. Okay, let's call it and set the results.

{
  "EnableConfigs": [
    "NET_9P",
    "NET_9P_FD",
    "9P_FS"
  ],
  "FocusSymbols": [
    "p9_client_abort",
    "p9_read_work",
    "p9_client_rpc",
    "p9_client_zc_rpc"
  ],
  "Reasoning": "The patch modifies the 9p client and transport code to handle fatal signals by aborting requests instead of waiting for TFLUSH. It introduces a new request status REQ_STATUS_ABORTED and modifies p9_client_rpc, p9_client_zc_rpc, and p9_read_work to handle it. This is a functional change in the core 9p client logic and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "NET_9P",
    "NET_9P_FD",
    "9P_FS"
  ],
  "FocusSymbols": [
    "p9_client_abort",
    "p9_read_work",
    "p9_client_rpc",
    "p9_client_zc_rpc"
  ],
  "Reasoning": "The patch modifies the 9p client and transport code to handle fatal signals by aborting requests instead of waiting for TFLUSH. It introduces a new request status REQ_STATUS_ABORTED and modifies p9_client_rpc, p9_client_zc_rpc, and p9_read_work to handle it. This is a functional change in the core 9p client logic and should be fuzzed.",
  "WorthFuzzing": true
}