KCSAN: data-race in ksys_write / ksys

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
e832d42f-4bc6-42a8-bb02-e383e613dc77	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in ksys_write / ksys_write (14)	2026/07/21 00:03	2026/07/21 00:03	2026/07/21 00:07	de6a700d843f1eae454018bc5041e06c62737db6
d10f8e82-2af1-4219-b232-a8c9d2c2b975	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in ksys_write / ksys_write (14)	2026/07/21 00:01	2026/07/21 00:01	2026/07/21 00:44	de6a700d843f1eae454018bc5041e06c62737db6
b283c298-dd9d-4042-8908-09fdd579cbad	assessment-kcsan		💥	KCSAN: data-race in ksys_write / ksys_write (14)	2026/07/19 15:35	2026/07/19 15:35	2026/07/19 15:55	72524a6625c995608a7d179201dff2195b8d1f66	(RECITATION)

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ksys_write / ksys_write (6) fs	6	1	1510d	1510d	0/29	auto-closed as invalid on 2022/07/09 10:17
upstream	KCSAN: data-race in ksys_write / ksys_write (2) fs	6	1	2190d	2190d	0/29	auto-closed as invalid on 2020/08/28 08:07
upstream	KCSAN: data-race in ksys_write / ksys_write (4) fs	6	2	2005d	2027d	0/29	auto-closed as invalid on 2021/03/01 11:18
upstream	KCSAN: data-race in ksys_write / ksys_write (5) fs	6	2	1645d	1662d	0/29	auto-closed as invalid on 2022/02/24 13:47
upstream	KCSAN: data-race in ksys_write / ksys_write (8) fs	6	1	1352d	1352d	0/29	auto-obsoleted due to no activity on 2022/12/14 10:38
upstream	KCSAN: data-race in ksys_write / ksys_write (7) fs	6	5	1389d	1460d	0/29	auto-obsoleted due to no activity on 2022/11/07 06:37
upstream	KCSAN: data-race in ksys_write / ksys_write (13) fs	6	1	605d	605d	0/29	auto-obsoleted due to no activity on 2025/01/19 23:33
upstream	KCSAN: data-race in ksys_write / ksys_write (11) fs	6	8	968d	956d	0/29	auto-obsoleted due to no activity on 2024/01/01 18:01
upstream	KCSAN: data-race in ksys_write / ksys_write (10) fs	6	1	1103d	1103d	0/29	auto-obsoleted due to no activity on 2023/08/20 13:19
upstream	KCSAN: data-race in ksys_write / ksys_write (3) fs	6	1	2075d	2054d	0/29	auto-closed as invalid on 2020/12/21 12:01
upstream	KCSAN: data-race in ksys_write / ksys_write fs	6	8	2257d	2445d	0/29	auto-closed as invalid on 2020/06/22 09:42
upstream	KCSAN: data-race in ksys_write / ksys_write (9) fs	6	2	1193d	1257d	0/29	auto-obsoleted due to no activity on 2023/05/22 00:31
upstream	KCSAN: data-race in ksys_write / ksys_write (12) fs	6	3	886d	912d	0/29	auto-obsoleted due to no activity on 2024/03/24 05:08

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in ksys_write / ksys_write (6) fs

1510d

0/29

auto-closed as invalid on 2022/07/09 10:17

upstream

KCSAN: data-race in ksys_write / ksys_write (2) fs

2190d

0/29

auto-closed as invalid on 2020/08/28 08:07

upstream

KCSAN: data-race in ksys_write / ksys_write (4) fs

2005d

2027d

0/29

auto-closed as invalid on 2021/03/01 11:18

upstream

KCSAN: data-race in ksys_write / ksys_write (5) fs

1645d

1662d

0/29

auto-closed as invalid on 2022/02/24 13:47

upstream

KCSAN: data-race in ksys_write / ksys_write (8) fs

1352d

0/29

auto-obsoleted due to no activity on 2022/12/14 10:38

upstream

KCSAN: data-race in ksys_write / ksys_write (7) fs

1389d

1460d

0/29

auto-obsoleted due to no activity on 2022/11/07 06:37

upstream

KCSAN: data-race in ksys_write / ksys_write (13) fs

605d

0/29

auto-obsoleted due to no activity on 2025/01/19 23:33

upstream

KCSAN: data-race in ksys_write / ksys_write (11) fs

968d

956d

0/29

auto-obsoleted due to no activity on 2024/01/01 18:01

upstream

KCSAN: data-race in ksys_write / ksys_write (10) fs

1103d

0/29

auto-obsoleted due to no activity on 2023/08/20 13:19

upstream

KCSAN: data-race in ksys_write / ksys_write (3) fs

2075d

2054d

0/29

auto-closed as invalid on 2020/12/21 12:01

upstream

KCSAN: data-race in ksys_write / ksys_write fs

2257d

2445d

0/29

auto-closed as invalid on 2020/06/22 09:42

upstream

KCSAN: data-race in ksys_write / ksys_write (9) fs

1193d

1257d

0/29

auto-obsoleted due to no activity on 2023/05/22 00:31

upstream

KCSAN: data-race in ksys_write / ksys_write (12) fs

886d

912d

0/29

auto-obsoleted due to no activity on 2024/03/24 05:08

================================================================== BUG: KCSAN: data-race in ksys_write / ksys_write write to 0xffff88812917a5a8 of 8 bytes by task 18103 on cpu 0: ksys_write+0x11c/0x1a0 fs/read_write.c:741 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:747 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88812917a5a8 of 8 bytes by task 18102 on cpu 1: ksys_write+0xb9/0x1a0 fs/read_write.c:736 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:747 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0x000000000000000b Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 18102 Comm: syz.3.4278 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/07/19 15:35	upstream	c6859eed755d	72524a66	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in ksys_write / ksys_write

Crashes (1):

Assets (help?)