AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/06/25 18:42	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.", "WorthFuzzing": false }
1/1	2026/06/25 18:42	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit b9300890e8382e5e00843f8a1e86ac975c33c958\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Jun 25 18:42:54 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c\nindex d78aec662586b8..ced0b95c876ccd 100644\n--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c\n+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c\n@@ -140,7 +140,7 @@ int main(int argc, char argv[])\n \tksft_print_header();\n \tksft_set_plan(7);\n \n-\tdevfd = open(\"/dev/udmabuf\", O_RDWR);\n+\tdevfd = open(\"/dev/udmabuf\", O_RDONLY);\n \tif (devfd \u003c 0) {\n \t\tksft_print_msg(\n \t\t\t\"%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\\n\",\ndiff --git a/tools/testing/selftests/drivers/net/hw/ncdevmem.c b/tools/testing/selftests/drivers/net/hw/ncdevmem.c\nindex e098d6534c3c88..8114a29692fdd5 100644\n--- a/tools/testing/selftests/drivers/net/hw/ncdevmem.c\n+++ b/tools/testing/selftests/drivers/net/hw/ncdevmem.c\n@@ -149,7 +149,7 @@ static struct memory_buffer udmabuf_alloc(size_t size)\n \n \tctx-\u003esize = size;\n \n-\tctx-\u003edevfd = open(\"/dev/udmabuf\", O_RDWR);\n+\tctx-\u003edevfd = open(\"/dev/udmabuf\", O_RDONLY);\n \tif (ctx-\u003edevfd \u003c 0) {\n \t\tpr_err(\"[skip,no-udmabuf: Unable to access DMA buffer device file]\");\n \t\tgoto err_free_ctx;\n" }
2/1	2026/06/25 18:42	agent	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.", "WorthFuzzing": false } 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 b9300890e8382e5e00843f8a1e86ac975c33c958 Author: syz-cluster <triage@syzkaller.com> Date: Thu Jun 25 18:42:54 2026 +0000 syz-cluster: applied patch under review diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c index d78aec662586b8..ced0b95c876ccd 100644 --- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c +++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c @@ -140,7 +140,7 @@ int main(int argc, char argv[]) ksft_print_header(); ksft_set_plan(7); - devfd = open("/dev/udmabuf", O_RDWR); + devfd = open("/dev/udmabuf", O_RDONLY); if (devfd < 0) { ksft_print_msg( "%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n", diff --git a/tools/testing/selftests/drivers/net/hw/ncdevmem.c b/tools/testing/selftests/drivers/net/hw/ncdevmem.c index e098d6534c3c88..8114a29692fdd5 100644 --- a/tools/testing/selftests/drivers/net/hw/ncdevmem.c +++ b/tools/testing/selftests/drivers/net/hw/ncdevmem.c @@ -149,7 +149,7 @@ static struct memory_buffer udmabuf_alloc(size_t size) ctx->size = size; - ctx->devfd = open("/dev/udmabuf", O_RDWR); + ctx->devfd = open("/dev/udmabuf", O_RDONLY); if (ctx->devfd < 0) { pr_err("[skip,no-udmabuf: Unable to access DMA buffer device file]"); goto err_free_ctx;
3/2	2026/06/25 18:42	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2162 output: 76 thoughts: 125 Thoughts: WorthFuzzing=False: A Quick Assessment Okay, here's the deal. I've reviewed this patch and it's pretty straightforward. My initial scan picked up that it's touching `udmabuf.c` and `ncdevmem.c`, specifically within the `tools/testing/selftests` directory. That immediately sets off a flag. These are user-space tests, not core kernel components. The key change is the modification of the `open()` call to `/dev/udmabuf`, shifting it from read/write to read-only access. Given the context of a self-test, this strongly suggests a change in the testing methodology or setup, and not a functional modification to how the driver actually behaves in the kernel. Therefore, because this patch is confined to selftests, I'm confident in concluding that it doesn't introduce any new kernel code paths or behaviors that would be relevant for fuzzing. No need to throw fuzzing cycles at this. It's a test tweak, not a kernel-level change. So, the bottom line is: `WorthFuzzing=false`. Moving on.
4/2	2026/06/25 18:43	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/06/25 18:42

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.",
  "WorthFuzzing": false
}

1/1

2026/06/25 18:42

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit b9300890e8382e5e00843f8a1e86ac975c33c958\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jun 25 18:42:54 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c\nindex d78aec662586b8..ced0b95c876ccd 100644\n--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c\n+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c\n@@ -140,7 +140,7 @@ int main(int argc, char *argv[])\n \tksft_print_header();\n \tksft_set_plan(7);\n \n-\tdevfd = open(\"/dev/udmabuf\", O_RDWR);\n+\tdevfd = open(\"/dev/udmabuf\", O_RDONLY);\n \tif (devfd \u003c 0) {\n \t\tksft_print_msg(\n \t\t\t\"%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\\n\",\ndiff --git a/tools/testing/selftests/drivers/net/hw/ncdevmem.c b/tools/testing/selftests/drivers/net/hw/ncdevmem.c\nindex e098d6534c3c88..8114a29692fdd5 100644\n--- a/tools/testing/selftests/drivers/net/hw/ncdevmem.c\n+++ b/tools/testing/selftests/drivers/net/hw/ncdevmem.c\n@@ -149,7 +149,7 @@ static struct memory_buffer *udmabuf_alloc(size_t size)\n \n \tctx-\u003esize = size;\n \n-\tctx-\u003edevfd = open(\"/dev/udmabuf\", O_RDWR);\n+\tctx-\u003edevfd = open(\"/dev/udmabuf\", O_RDONLY);\n \tif (ctx-\u003edevfd \u003c 0) {\n \t\tpr_err(\"[skip,no-udmabuf: Unable to access DMA buffer device file]\");\n \t\tgoto err_free_ctx;\n"
}

2/1

2026/06/25 18:42

agent

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.",
  "WorthFuzzing": false
}

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 b9300890e8382e5e00843f8a1e86ac975c33c958
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jun 25 18:42:54 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
index d78aec662586b8..ced0b95c876ccd 100644
--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
@@ -140,7 +140,7 @@ int main(int argc, char *argv[])
 	ksft_print_header();
 	ksft_set_plan(7);
 
-	devfd = open("/dev/udmabuf", O_RDWR);
+	devfd = open("/dev/udmabuf", O_RDONLY);
 	if (devfd < 0) {
 		ksft_print_msg(
 			"%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
diff --git a/tools/testing/selftests/drivers/net/hw/ncdevmem.c b/tools/testing/selftests/drivers/net/hw/ncdevmem.c
index e098d6534c3c88..8114a29692fdd5 100644
--- a/tools/testing/selftests/drivers/net/hw/ncdevmem.c
+++ b/tools/testing/selftests/drivers/net/hw/ncdevmem.c
@@ -149,7 +149,7 @@ static struct memory_buffer *udmabuf_alloc(size_t size)
 
 	ctx->size = size;
 
-	ctx->devfd = open("/dev/udmabuf", O_RDWR);
+	ctx->devfd = open("/dev/udmabuf", O_RDONLY);
 	if (ctx->devfd < 0) {
 		pr_err("[skip,no-udmabuf: Unable to access DMA buffer device file]");
 		goto err_free_ctx;

3/2

2026/06/25 18:42

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2162
							output: 76
							thoughts: 125

Thoughts:

**WorthFuzzing=False: A Quick Assessment**

Okay, here's the deal. I've reviewed this patch and it's pretty straightforward. My initial scan picked up that it's touching `udmabuf.c` and `ncdevmem.c`, specifically within the `tools/testing/selftests` directory. That immediately sets off a flag. These are user-space tests, not core kernel components. The key change is the modification of the `open()` call to `/dev/udmabuf`, shifting it from read/write to read-only access. Given the context of a self-test, this strongly suggests a change in the testing methodology or setup, and not a functional modification to how the driver actually *behaves* in the kernel.

Therefore, because this patch is confined to selftests, I'm confident in concluding that it doesn't introduce any new kernel code paths or behaviors that would be relevant for fuzzing. No need to throw fuzzing cycles at this. It's a test tweak, not a kernel-level change. So, the bottom line is: `WorthFuzzing=false`. Moving on.

4/2

2026/06/25 18:43

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests in tools/testing/selftests/, which are user-space testing tools, not kernel code. Therefore, there are no functional changes to the kernel that should be fuzzed.",
  "WorthFuzzing": false
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)