KCSAN: data-race in pipe_release / pipe_wait

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
9b55deb6-66d5-4afc-b77a-5905949764b8	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in pipe_release / pipe_wait_writable (5)	2026/05/26 16:00	2026/05/26 16:00	2026/05/26 16:25	76d4b4b1b168407cf701ec594f642e93a00ce699
015e9f11-d079-44ea-b110-1fb7d562a77f	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in pipe_release / pipe_wait_writable (5)	2026/04/06 20:46	2026/04/06 20:46	2026/04/06 21:07	4440e7c2e964875f9e35dba6deda12c2195f19d3

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in pipe_release / pipe_wait_writable fs	6	1	1607d	1607d	0/29	auto-closed as invalid on 2022/02/23 01:29
upstream	KCSAN: data-race in pipe_release / pipe_wait_writable (2) fs	6	1	1312d	1312d	0/29	auto-obsoleted due to no activity on 2022/12/15 02:24
upstream	KCSAN: data-race in pipe_release / pipe_wait_writable (4) fs	6	2	233d	254d	0/29	auto-obsoleted due to no activity on 2025/12/19 13:50
upstream	KCSAN: data-race in pipe_release / pipe_wait_writable (3) fs	6	2	318d	318d	0/29	auto-obsoleted due to no activity on 2025/09/25 08:20

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in pipe_release / pipe_wait_writable fs

1607d

0/29

auto-closed as invalid on 2022/02/23 01:29

upstream

KCSAN: data-race in pipe_release / pipe_wait_writable (2) fs

1312d

0/29

auto-obsoleted due to no activity on 2022/12/15 02:24

upstream

KCSAN: data-race in pipe_release / pipe_wait_writable (4) fs

233d

254d

0/29

auto-obsoleted due to no activity on 2025/12/19 13:50

upstream

KCSAN: data-race in pipe_release / pipe_wait_writable (3) fs

318d

0/29

auto-obsoleted due to no activity on 2025/09/25 08:20

================================================================== BUG: KCSAN: data-race in pipe_release / pipe_wait_writable read-write to 0xffff88811bdfb5ac of 4 bytes by task 9866 on cpu 1: put_pipe_info fs/pipe.c:714 [inline] pipe_release+0x16a/0x1d0 fs/pipe.c:744 __fput+0x29b/0x650 fs/file_table.c:469 fput_close_sync+0xad/0x190 fs/file_table.c:574 __do_sys_close fs/open.c:1509 [inline] __se_sys_close fs/open.c:1494 [inline] __x64_sys_close+0x55/0xf0 fs/open.c:1494 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811bdfb5ac of 4 bytes by task 9863 on cpu 0: pipe_lock fs/pipe.c:90 [inline] pipe_wait_writable+0x202/0x250 fs/pipe.c:1084 wait_for_space fs/splice.c:1272 [inline] vmsplice_to_pipe fs/splice.c:1551 [inline] __do_sys_vmsplice fs/splice.c:1608 [inline] __se_sys_vmsplice+0x42b/0xfd0 fs/splice.c:1578 __x64_sys_vmsplice+0x55/0x70 fs/splice.c:1578 x64_sys_call+0x28e9/0x3020 arch/x86/include/generated/asm/syscalls_64.h:279 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000002 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 9863 Comm: syz.1.2745 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/04/06 20:46	upstream	bfe62a454542	4440e7c2	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in pipe_release / pipe_wait_writable

Crashes (1):

Assets (help?)