KCSAN: data-race in __fsnotify_parent / fsnotify_detach_connector_from

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __fsnotify_parent / fsnotify_detach_connector_from_object (2) fs	6				6	2061d	2201d	0/29	auto-closed as invalid on 2020/06/16 20:23
upstream	KCSAN: data-race in __fsnotify_parent / fsnotify_detach_connector_from_object (3) exfat	6	syz			978	583d	722d	0/29	moderation: reported syz repro on 2023/12/08 00:00

================================================================== BUG: KCSAN: data-race in __fsnotify_parent / fsnotify_detach_connector_from_object read to 0xffff88812512481c of 4 bytes by task 29333 on cpu 0: __fsnotify_parent+0xc7/0x230 fs/notify/fsnotify.c:157 fsnotify_parent include/linux/fsnotify.h:40 [inline] fsnotify_path include/linux/fsnotify.h:50 [inline] fsnotify_perm include/linux/fsnotify.h:85 [inline] security_file_permission+0x194/0x280 security/security.c:1379 rw_verify_area+0xe1/0x250 fs/read_write.c:399 do_splice_to+0x6c/0x130 fs/splice.c:865 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812512481c of 4 bytes by task 29332 on cpu 1: fsnotify_detach_connector_from_object+0xb8/0x210 fs/notify/mark.c:184 fsnotify_put_mark+0x2e9/0x3b0 fs/notify/mark.c:250 fsnotify_clear_marks_by_group+0x2b1/0x320 fs/notify/mark.c:760 fsnotify_destroy_group+0x66/0x190 fs/notify/group.c:60 fanotify_release+0x212/0x240 fs/notify/fanotify/fanotify_user.c:488 __fput+0x1e1/0x520 fs/file_table.c:280 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 29332 Comm: syz-executor.1 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================