KCSAN: data-race in fasync_remove_entry / kill

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (2) fs	6	1	2162d	2162d	0/29	auto-closed as invalid on 2020/09/27 12:17
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (12) fs	6	1	623d	623d	0/29	auto-obsoleted due to no activity on 2025/01/04 10:04
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (4) fs	6	1	1893d	1893d	0/29	auto-closed as invalid on 2021/06/23 11:06
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (5) fs	6	2	1823d	1825d	0/29	auto-closed as invalid on 2021/08/31 22:21
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (9) fs	6	1	1343d	1343d	0/29	auto-obsoleted due to no activity on 2023/01/02 11:50
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (13) fs	6	1	557d	557d	0/29	auto-obsoleted due to no activity on 2025/03/11 12:00
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (3) fs	6	1	2045d	2045d	0/29	auto-closed as invalid on 2021/01/22 14:57
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (11) fs	6	3	707d	735d	0/29	auto-obsoleted due to no activity on 2024/09/21 19:37
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (6) fs	6	1	1763d	1763d	0/29	auto-closed as invalid on 2021/10/31 16:09
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (7) fs	6	4	1684d	1722d	0/29	auto-closed as invalid on 2022/01/18 10:05
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (8) fs	6	3	1629d	1638d	0/29	auto-closed as invalid on 2022/03/14 14:59
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync fs	6	82	2216d	2373d	0/29	auto-closed as invalid on 2020/08/04 12:11
upstream	KCSAN: data-race in fasync_remove_entry / kill_fasync (14) fs	6	2	329d	336d	0/29	auto-obsoleted due to no activity on 2025/10/25 06:06

================================================================== BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync write to 0xffff888109cb2358 of 8 bytes by task 14061 on cpu 1: fasync_remove_entry+0xd5/0x130 fs/fcntl.c:878 fasync_helper+0x96/0xc0 fs/fcntl.c:977 sock_fasync+0x60/0xd0 net/socket.c:1423 __fput+0x5b2/0x600 fs/file_table.c:375 ____fput+0x15/0x20 fs/file_table.c:406 task_work_run+0x135/0x1a0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888109cb2358 of 8 bytes by task 14073 on cpu 0: kill_fasync+0x24/0x150 fs/fcntl.c:1016 sock_wake_async+0xf5/0x120 sk_wake_async include/net/sock.h:2530 [inline] unix_release_sock+0x483/0x780 net/unix/af_unix.c:636 unix_release+0x52/0x70 net/unix/af_unix.c:1042 __sock_release net/socket.c:654 [inline] sock_close+0x70/0x150 net/socket.c:1398 __fput+0x303/0x600 fs/file_table.c:378 ____fput+0x15/0x20 fs/file_table.c:406 task_work_run+0x135/0x1a0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffff88812d36e210 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14073 Comm: syz-executor.2 Not tainted 6.4.0-syzkaller-01371-g04fc8904d5d1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================