KCSAN: data-race in __fput / ep

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __fput / ep_remove (2) fs				2	840d	868d	0/27	auto-closed as invalid on 2022/06/25 02:37
upstream	KCSAN: data-race in __fput / ep_remove fs				1	1228d	1228d	0/27	auto-closed as invalid on 2021/06/02 19:47

================================================================== BUG: KCSAN: data-race in __fput / ep_remove write to 0xffff888104eaa9d0 of 8 bytes by task 8937 on cpu 1: ep_remove+0x336/0x390 fs/eventpoll.c:706 ep_free+0x164/0x1f0 fs/eventpoll.c:780 ep_eventpoll_release+0x32/0x40 fs/eventpoll.c:797 __fput+0x245/0x570 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888104eaa9d0 of 8 bytes by task 8933 on cpu 0: eventpoll_release include/linux/eventpoll.h:45 [inline] __fput+0x1c8/0x570 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffff888104863920 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8933 Comm: syz-executor.1 Tainted: G W 6.2.0-rc7-syzkaller-00018-g0983f6bf2bfc-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 ==================================================================