KCSAN: data-race in do_writev / do

KCSAN: data-race in do_writev / do_writev

Status: auto-closed as invalid on 2022/02/20 05:25
Subsystems: fs
[Documentation on labels]
First crash: 1442d, last: 1442d

▶ ▼ Similar bugs (2)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_writev / do_writev (2) fs	6				1	1249d	1249d	0/29	auto-closed as invalid on 2022/09/01 10:18
upstream	KCSAN: data-race in do_writev / do_writev (3) fs	6				1	729d	729d	0/29	auto-obsoleted due to no activity on 2024/02/03 04:06

Sample crash report:

==================================================================
BUG: KCSAN: data-race in do_writev / do_writev

write to 0xffff888104322b68 of 8 bytes by task 2581 on cpu 1:
 do_writev+0x35d/0x4d0 fs/read_write.c:969
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1037
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff888104322b68 of 8 bytes by task 2580 on cpu 0:
 do_writev+0x35d/0x4d0 fs/read_write.c:969
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1037
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000ff0 -> 0x0000000000002fae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2580 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2022/01/16 05:22	upstream	a33f5c380c4b	723cfaf0	.config	console log	report			info		ci2-upstream-kcsan-gce	KCSAN: data-race in do_writev / do_writev

* ~~Struck through~~ repros no longer work on HEAD.