KCSAN: data-race in kauditd_thread / mm_update_next

KCSAN: data-race in kauditd_thread / mm_update_next_owner

Status: auto-closed as invalid on 2020/09/30 10:48
Subsystems: audit
[Documentation on labels]
First crash: 1332d, last: 1332d

▶ ▼ Similar bugs (1)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in kauditd_thread / mm_update_next_owner (2) audit				1	1122d	1122d	0/26	auto-closed as invalid on 2021/04/27 17:29

Sample crash report:

==================================================================
BUG: KCSAN: data-race in kauditd_thread / mm_update_next_owner

write to 0xffff88812b01f064 of 4 bytes by task 28 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 kauditd_thread+0x52c/0x680 kernel/audit.c:881
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88812b01f064 of 4 bytes by task 13785 on cpu 1:
 mm_update_next_owner+0x1d9/0x4a0 kernel/exit.c:387
 exit_mm+0x2c0/0x330 kernel/exit.c:482
 do_exit+0x40f/0x16c0 kernel/exit.c:793
 do_group_exit+0x17a/0x180 kernel/exit.c:903
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:914
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:912
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13785 Comm: syz-executor.5 Not tainted 5.9.0-rc2-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
2020/08/26 10:46	upstream	2ac69819ba9e	318430cb	.config	console log	report					ci2-upstream-kcsan-gce

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