KCSAN: data-race in pipe_release / pipe

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
cec342a5-481f-4e64-9edd-d5ac6173e770	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in pipe_release / pipe_unlock (2)	2026/05/25 18:44	2026/05/25 18:44	2026/05/25 19:35	c69befb30ac10e158cc9d1557b508ee3f0eca1de
11a482e8-7fe5-4ca0-9436-1be3771f7e09	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in pipe_release / pipe_unlock (2)	2026/05/10 04:02	2026/05/10 04:02	2026/05/10 04:05	29233ece713919081e9069c2a18be92526041f39

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in pipe_release / pipe_unlock fs	6				1	2031d	2003d	0/29	auto-closed as invalid on 2020/12/21 11:59

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in pipe_release / pipe_unlock fs

2031d

2003d

0/29

auto-closed as invalid on 2020/12/21 11:59

================================================================== BUG: KCSAN: data-race in pipe_release / pipe_unlock read-write to 0xffff88811d68ede4 of 4 bytes by task 14654 on cpu 1: put_pipe_info fs/pipe.c:714 [inline] pipe_release+0x16a/0x1d0 fs/pipe.c:744 __fput+0x29b/0x630 fs/file_table.c:510 ____fput+0x1c/0x30 fs/file_table.c:538 task_work_run+0x130/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x211/0x820 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x232/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811d68ede4 of 4 bytes by task 14660 on cpu 0: pipe_unlock+0x17/0x50 fs/pipe.c:97 link_pipe fs/splice.c:1920 [inline] do_tee+0x59c/0x910 fs/splice.c:1965 __do_sys_tee fs/splice.c:1993 [inline] __se_sys_tee+0x93/0x130 fs/splice.c:1977 __x64_sys_tee+0x55/0x70 fs/splice.c:1977 x64_sys_call+0x28bd/0x3020 arch/x86/include/generated/asm/syscalls_64.h:277 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 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: 14660 Comm: syz.5.2690 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/05/09 23:19	upstream	e92b2872d0b1	29233ece	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in pipe_release / pipe_unlock

Crashes (1):

Assets (help?)