KCSAN: data-race in fsnotify / fsnotify_clear_marks_by

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fsnotify / fsnotify_clear_marks_by_group (2) fs				1	1140d	1140d	0/26	auto-closed as invalid on 2021/04/23 13:37

================================================================== BUG: KCSAN: data-race in fsnotify / fsnotify_clear_marks_by_group write to 0xffff8881448461ac of 4 bytes by task 22788 on cpu 0: fsnotify_free_mark fs/notify/mark.c:418 [inline] fsnotify_clear_marks_by_group+0x2fb/0x3e0 fs/notify/mark.c:763 fsnotify_destroy_group+0x51/0x170 fs/notify/group.c:61 fanotify_release+0x2c5/0x2e0 fs/notify/fanotify/fanotify_user.c:623 __fput+0x243/0x4d0 fs/file_table.c:281 ____fput+0x11/0x20 fs/file_table.c:314 task_work_run+0x8e/0x110 kernel/task_work.c:151 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:164 [inline] exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881448461ac of 4 bytes by task 22793 on cpu 1: send_to_group fs/notify/fsnotify.c:299 [inline] fsnotify+0x723/0xe70 fs/notify/fsnotify.c:506 __fsnotify_parent+0x2f3/0x430 fs/notify/fsnotify.c:225 fsnotify_parent include/linux/fsnotify.h:68 [inline] fsnotify_file include/linux/fsnotify.h:90 [inline] fsnotify_modify include/linux/fsnotify.h:255 [inline] do_iter_write+0x432/0x4b0 fs/read_write.c:870 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x42a/0x780 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 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: 22793 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================