AI Trajectory

null

{
  "EnableConfigs": [
    "IO_URING"
  ],
  "FocusSymbols": [
    "io_read",
    "io_read_mshot"
  ],
  "Reasoning": "The patch modifies io_uring read operations to properly handle and translate restart error codes (like -ERESTARTSYS) into -EINTR, preventing syscall restarts when sqes are already in progress. This is a functional change in core io_uring logic.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 02b55d564c09c3344afb071f815d55bbfbcca5b6\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Jul 20 16:12:27 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/io_uring/rw.c b/io_uring/rw.c\nindex 63b6519e498cd7..e505479e3773f3 100644\n--- a/io_uring/rw.c\n+++ b/io_uring/rw.c\n@@ -615,6 +615,24 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)\n \tsmp_store_release(\u0026req-\u003eiopoll_completed, 1);\n }\n \n+static inline ssize_t io_fixup_restart_res(ssize_t ret)\n+{\n+\tswitch (ret) {\n+\tcase -ERESTARTSYS:\n+\tcase -ERESTARTNOINTR:\n+\tcase -ERESTARTNOHAND:\n+\tcase -ERESTART_RESTARTBLOCK:\n+\t\t/*\n+\t\t * We can't just restart the syscall, since previously\n+\t\t * submitted sqes may already be in progress. Just fail\n+\t\t * this IO with EINTR.\n+\t\t */\n+\t\treturn -EINTR;\n+\tdefault:\n+\t\treturn ret;\n+\t}\n+}\n+\n static inline void io_rw_done(struct io_kiocb *req, ssize_t ret)\n {\n \tstruct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);\n@@ -625,19 +643,7 @@ static inline void io_rw_done(struct io_kiocb *req, ssize_t ret)\n \n \t/* transform internal restart error codes */\n \tif (unlikely(ret \u003c 0)) {\n-\t\tswitch (ret) {\n-\t\tcase -ERESTARTSYS:\n-\t\tcase -ERESTARTNOINTR:\n-\t\tcase -ERESTARTNOHAND:\n-\t\tcase -ERESTART_RESTARTBLOCK:\n-\t\t\t/*\n-\t\t\t * We can't just restart the syscall, since previously\n-\t\t\t * submitted sqes may already be in progress. Just fail\n-\t\t\t * this IO with EINTR.\n-\t\t\t */\n-\t\t\tret = -EINTR;\n-\t\t\tbreak;\n-\t\t}\n+\t\tret = io_fixup_restart_res(ret);\n \t}\n \n \tif (req-\u003eflags \u0026 REQ_F_IOPOLL)\n@@ -1034,6 +1040,8 @@ int io_read(struct io_kiocb *req, unsigned int issue_flags)\n \n \tif (req-\u003eflags \u0026 REQ_F_BUFFERS_COMMIT)\n \t\tio_kbuf_recycle(req, sel.buf_list, issue_flags);\n+\n+\tret = io_fixup_restart_res(ret);\n \treturn ret;\n }\n \n@@ -1068,8 +1076,10 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)\n \t\treturn IOU_RETRY;\n \t} else if (ret \u003c= 0) {\n \t\tio_kbuf_recycle(req, sel.buf_list, issue_flags);\n-\t\tif (ret \u003c 0)\n+\t\tif (ret \u003c 0) {\n+\t\t\tret = io_fixup_restart_res(ret);\n \t\t\treq_set_fail(req);\n+\t\t}\n \t} else if (!(req-\u003eflags \u0026 REQ_F_APOLL_MULTISHOT)) {\n \t\tcflags = io_put_kbuf(req, ret, sel.buf_list);\n \t} else {\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "IO_URING"
  ],
  "FocusSymbols": [
    "io_read",
    "io_read_mshot"
  ],
  "Reasoning": "The patch modifies io_uring read operations to properly handle and translate restart error codes (like -ERESTARTSYS) into -EINTR, preventing syscall restarts when sqes are already in progress. This is a functional change in core io_uring logic.",
  "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 02b55d564c09c3344afb071f815d55bbfbcca5b6
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Jul 20 16:12:27 2026 +0000

    syz-cluster: applied patch under review

diff --git a/io_uring/rw.c b/io_uring/rw.c
index 63b6519e498cd7..e505479e3773f3 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -615,6 +615,24 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)
 	smp_store_release(&req->iopoll_completed, 1);
 }
 
+static inline ssize_t io_fixup_restart_res(ssize_t ret)
+{
+	switch (ret) {
+	case -ERESTARTSYS:
+	case -ERESTARTNOINTR:
+	case -ERESTARTNOHAND:
+	case -ERESTART_RESTARTBLOCK:
+		/*
+		 * We can't just restart the syscall, since previously
+		 * submitted sqes may already be in progress. Just fail
+		 * this IO with EINTR.
+		 */
+		return -EINTR;
+	default:
+		return ret;
+	}
+}
+
 static inline void io_rw_done(struct io_kiocb *req, ssize_t ret)
 {
 	struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);
@@ -625,19 +643,7 @@ static inline void io_rw_done(struct io_kiocb *req, ssize_t ret)
 
 	/* transform internal restart error codes */
 	if (unlikely(ret < 0)) {
-		switch (ret) {
-		case -ERESTARTSYS:
-		case -ERESTARTNOINTR:
-		case -ERESTARTNOHAND:
-		case -ERESTART_RESTARTBLOCK:
-			/*
-			 * We can't just restart the syscall, since previously
-			 * submitted sqes may already be in progress. Just fail
-			 * this IO with EINTR.
-			 */
-			ret = -EINTR;
-			break;
-		}
+		ret = io_fixup_restart_res(ret);
 	}
 
 	if (req->flags & REQ_F_IOPOLL)
@@ -1034,6 +1040,8 @@ int io_read(struct io_kiocb *req, unsigned int issue_flags)
 
 	if (req->flags & REQ_F_BUFFERS_COMMIT)
 		io_kbuf_recycle(req, sel.buf_list, issue_flags);
+
+	ret = io_fixup_restart_res(ret);
 	return ret;
 }
 
@@ -1068,8 +1076,10 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
 		return IOU_RETRY;
 	} else if (ret <= 0) {
 		io_kbuf_recycle(req, sel.buf_list, issue_flags);
-		if (ret < 0)
+		if (ret < 0) {
+			ret = io_fixup_restart_res(ret);
 			req_set_fail(req);
+		}
 	} else if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
 		cflags = io_put_kbuf(req, ret, sel.buf_list);
 	} else {

gemini-3.1-pro-preview

null

null

							input: 2565
							output: 28
							thoughts: 228
						

**Analyzing the io_uring Read Path**

Okay, so I'm looking at this patch that's refactoring some code within `io_uring/rw.c`. Specifically, they've taken a switch statement and moved it into an inline function, `io_fixup_restart_res`. The interesting part is that this new function is now being used within `io_rw_done`, `io_read`, and `io_read_mshot`. Functionally, this is a change because `io_read` and `io_read_mshot` now handle restart error code fix-ups differently – and, importantly, they didn't do this before in the same way (or even necessarily at the same point).

Given this, I should probably check `io_read` and `io_read_mshot` in `io_uring/rw.c` more closely. It looks like these are core functions within the io_uring system for handling read operations, which makes them prime targets for fuzzing. I mean, any change touching these areas, especially those handling error conditions, is definitely worth a thorough fuzzing campaign.

So, let's keep `io_read`, `io_read_mshot`, and `io_rw_done` as our focus symbols. Also, make sure that `IO_URING` is enabled. Time to verify if `IO_URING` is the correct configuration to enable these functions.

{
  "Expression": "config IO_URING",
  "PathPrefix": "init/Kconfig"
}

{
  "Output": "init/Kconfig=1907=config AIO\n--\ninit/Kconfig-1914-\ninit/Kconfig:1915:config IO_URING\ninit/Kconfig-1916-\tbool \"Enable IO uring support\" if EXPERT\n--\ninit/Kconfig=1924=config GCOV_PROFILE_URING\n--\ninit/Kconfig-1936-\ninit/Kconfig:1937:config IO_URING_MOCK_FILE\ninit/Kconfig-1938-\ttristate \"Enable io_uring mock files (Experimental)\" if EXPERT\n"
}

gemini-3.1-pro-preview

null

null

							input: 3285
							output: 28
							thoughts: 45
						

Okay, here's my interpretation of those thoughts, framed as my own:

**IO_URING Configuration Confirmation and Verification**

Right, *IO_URING* is definitely the core configuration setting we're dealing with here. My immediate thought is, "Okay, that seems right, but let's just double-check." I always double-check. I want to make sure we're not missing any subtle interactions or dependencies.

So, I'm thinking, "Are there *any* other relevant configs that might impact this? Is there anything else in play? I want to verify that *IO_URING* is the primary switch."

A quick check confirms my initial hunch. The evidence here is that the file *`io_uring/rw.c`* is compiled as a part of the build when `CONFIG_IO_URING` is activated. That's good. That strongly supports the idea that this is our controlling factor. This confirms that `CONFIG_IO_URING` is the key.

{
  "Expression": "rw\\.o",
  "PathPrefix": "io_uring/Makefile"
}

{
  "Output": "io_uring/Makefile=9=obj-$(CONFIG_IO_URING)\t\t+= io_uring.o opdef.o kbuf.o rsrc.o notif.o \\\nio_uring/Makefile:10:\t\t\t\t\ttctx.o filetable.o rw.o poll.o \\\nio_uring/Makefile-11-\t\t\t\t\ttw.o wait.o eventfd.o uring_cmd.o \\\n"
}

gemini-3.1-pro-preview

null

null

							input: 3678
							output: 32
							thoughts: 55
						

Okay, here's my interpretation of these thoughts, formatted as you requested:

**Assessing the `CONFIG_IO_URING` Context**

Alright, confirmed – we're dealing with `CONFIG_IO_URING`. Now, I need to focus. My internal checklist flags `io_read` and `io_read_mshot` as potentially key symbols within this context. I need to quickly assess if these are, in fact, relevant and useful focus points. Let's dig in and see if this hunch holds water.

{
  "Expression": "int io_read\\(",
  "PathPrefix": "io_uring/rw.c"
}

{
  "Output": "io_uring/rw.c=918=static int __io_read(struct io_kiocb *req, struct io_br_sel *sel,\n--\nio_uring/rw.c-1031-\nio_uring/rw.c:1032:int io_read(struct io_kiocb *req, unsigned int issue_flags)\nio_uring/rw.c-1033-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 3991
							output: 35
							thoughts: 2
						

Okay, here's the summary, assuming "Yes" is the complete text and I'm an expert in whatever field it implicitly touches upon:

**Affirmation and Immediate Understanding**

Right, that's it. *Yes*. The simplicity of it is almost elegant. It's a concise encapsulation of... well, whatever context this is referring to, I already understand it. There's no need for further explanation or elaboration. The implied agreement or confirmation resonates perfectly with my established knowledge and expertise. This single word serves as a conclusive evaluation. It's an unambiguous affirmation.

{
  "Expression": "int io_read_mshot\\(",
  "PathPrefix": "io_uring/rw.c"
}

{
  "Output": "io_uring/rw.c=1032=int io_read(struct io_kiocb *req, unsigned int issue_flags)\n--\nio_uring/rw.c-1047-\nio_uring/rw.c:1048:int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)\nio_uring/rw.c-1049-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 4263
							output: 102
							thoughts: 11
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Initiating the Process**

Yes, that's the confirmation I needed. The core concept is sound and aligned with the established principles. Now, the next logical step is to operationalize this. I need to formally label this action or process. Let's call it "set-results." That term accurately encapsulates the intended outcome: to establish the definitive output of this particular operation. It is a precise and concise identifier for this distinct element of the process.

{
  "EnableConfigs": [
    "IO_URING"
  ],
  "FocusSymbols": [
    "io_read",
    "io_read_mshot"
  ],
  "Reasoning": "The patch modifies io_uring read operations to properly handle and translate restart error codes (like -ERESTARTSYS) into -EINTR, preventing syscall restarts when sqes are already in progress. This is a functional change in core io_uring logic.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "IO_URING"
  ],
  "FocusSymbols": [
    "io_read",
    "io_read_mshot"
  ],
  "Reasoning": "The patch modifies io_uring read operations to properly handle and translate restart error codes (like -ERESTARTSYS) into -EINTR, preventing syscall restarts when sqes are already in progress. This is a functional change in core io_uring logic.",
  "WorthFuzzing": true
}