KCSAN: data-race in do_writev / do

KCSAN: data-race in do_writev / do_writev (2)

Status: auto-closed as invalid on 2022/09/01 10:18
Subsystems: fs
[Documentation on labels]
First crash: 1228d, last: 1228d

▶ ▼ 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 (3) fs	6				1	708d	708d	0/29	auto-obsoleted due to no activity on 2024/02/03 04:06
upstream	KCSAN: data-race in do_writev / do_writev fs	6				1	1421d	1421d	0/29	auto-closed as invalid on 2022/02/20 05:25

Sample crash report:

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

write to 0xffff88813b02a568 of 8 bytes by task 27779 on cpu 1:
 do_writev+0x351/0x4b0 fs/read_write.c:986
 __do_sys_writev fs/read_write.c:1057 [inline]
 __se_sys_writev fs/read_write.c:1054 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1054
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff88813b02a568 of 8 bytes by task 27777 on cpu 0:
 do_writev+0x351/0x4b0 fs/read_write.c:986
 __do_sys_writev fs/read_write.c:1057 [inline]
 __se_sys_writev fs/read_write.c:1054 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1054
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000032d6 -> 0x00000000000054ba

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27777 Comm: syz-executor.3 Not tainted 5.19.0-rc8-syzkaller-00025-g6e7765cb477a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2022/07/28 10:16	upstream	6e7765cb477a	fb95c74d	.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.