KCSAN: data-race in __fput / ep

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __fput / ep_remove (2) fs	6				2	1175d	1203d	0/29	auto-closed as invalid on 2022/06/25 02:37
upstream	KCSAN: data-race in __fput / ep_remove (3) fs	6				1	910d	910d	0/29	auto-obsoleted due to no activity on 2023/04/06 07:53

================================================================== BUG: KCSAN: data-race in __fput / ep_remove write to 0xffff8881009568d0 of 8 bytes by task 12727 on cpu 1: ep_remove+0x30b/0x360 fs/eventpoll.c:691 ep_free+0x17b/0x200 fs/eventpoll.c:765 ep_eventpoll_release+0x2e/0x40 fs/eventpoll.c:782 __fput+0x25b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:140 get_signal+0x154d/0x15d0 kernel/signal.c:2554 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881009568d0 of 8 bytes by task 12746 on cpu 0: eventpoll_release include/linux/eventpoll.h:45 [inline] __fput+0x1de/0x4e0 fs/file_table.c:271 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:140 get_signal+0x154d/0x15d0 kernel/signal.c:2554 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12746 Comm: syz-executor.2 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================