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KCSAN: data-race in fasync_remove_entry / sock_wake_async (9)

Status: auto-obsoleted due to no activity on 2022/11/28 02:38
Subsystems: fs
[Documentation on labels]
First crash: 1332d, last: 1326d
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (4) fs 6 1 2119d 2119d 0/29 auto-closed as invalid on 2020/09/26 10:37
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (10) fs 6 1 1200d 1200d 0/29 auto-obsoleted due to no activity on 2023/04/24 02:17
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async fs 6 1 2276d 2276d 0/29 auto-closed as invalid on 2020/05/26 22:23
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (5) fs 6 3 1846d 1883d 0/29 auto-closed as invalid on 2021/06/26 18:07
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (8) fs 6 1 1542d 1542d 0/29 auto-closed as invalid on 2022/04/26 03:12
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (6) fs 6 2 1642d 1669d 0/29 auto-closed as invalid on 2022/01/16 09:31
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (2) fs 6 1 2203d 2203d 0/29 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (12) fs prio:low 6 51 14d 723d 0/29 moderation: reported on 2024/06/18 10:08
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (11) fs 6 1 1106d 1106d 0/29 auto-obsoleted due to no activity on 2023/07/06 10:32
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (3) fs 6 1 2171d 2171d 0/29 auto-closed as invalid on 2020/08/05 10:16
upstream KCSAN: data-race in fasync_remove_entry / sock_wake_async (7) fs 6 1 1588d 1588d 0/29 auto-closed as invalid on 2022/03/11 19:41

Sample crash report:
==================================================================
BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async

write to 0xffff88814c864958 of 8 bytes by task 9083 on cpu 1:
 fasync_remove_entry+0xd5/0x130 fs/fcntl.c:877
 fasync_helper+0x92/0xc0 fs/fcntl.c:976
 sock_fasync+0x5c/0xc0 net/socket.c:1390
 __fput+0x532/0x570 fs/file_table.c:317
 ____fput+0x11/0x20 fs/file_table.c:348
 task_work_run+0xde/0x110 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88814c864958 of 8 bytes by task 9080 on cpu 0:
 sock_wake_async+0x26/0x100 net/socket.c:1405
 sk_wake_async include/net/sock.h:2517 [inline]
 unix_release_sock+0x49d/0x7b0 net/unix/af_unix.c:635
 unix_release+0x4e/0x70 net/unix/af_unix.c:1041
 __sock_release net/socket.c:650 [inline]
 sock_close+0x6c/0x150 net/socket.c:1365
 __fput+0x245/0x570 fs/file_table.c:320
 ____fput+0x11/0x20 fs/file_table.c:348
 task_work_run+0xde/0x110 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff8881498e2330 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9080 Comm: syz-executor.5 Not tainted 6.1.0-rc1-syzkaller-00427-gd47136c28015-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/24 02:30 upstream d47136c28015 23bf86af .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in fasync_remove_entry / sock_wake_async
2022/10/18 12:32 upstream bb1a1146467a b31320fc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in fasync_remove_entry / sock_wake_async
* Struck through repros no longer work on HEAD.