KCSAN: data-race in fsnotify_parent / vfs

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fsnotify_parent / vfs_unlink (2) fs				3	1379d	1387d	0/26	auto-closed as invalid on 2020/08/21 15:37

================================================================== BUG: KCSAN: data-race in fsnotify_parent / vfs_unlink write to 0xffff888120bc2180 of 4 bytes by task 26490 on cpu 1: dont_mount include/linux/dcache.h:352 [inline] vfs_unlink+0x267/0x400 fs/namei.c:3811 do_unlinkat+0x33f/0x550 fs/namei.c:3873 __do_sys_unlink fs/namei.c:3920 [inline] __se_sys_unlink fs/namei.c:3918 [inline] __x64_sys_unlink+0x38/0x50 fs/namei.c:3918 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888120bc2180 of 4 bytes by task 26485 on cpu 0: fsnotify_parent+0x4d/0x1b0 fs/notify/fsnotify.c:153 fsnotify_file include/linux/fsnotify.h:74 [inline] fsnotify_perm include/linux/fsnotify.h:103 [inline] fsnotify_perm include/linux/fsnotify.h:82 [inline] security_file_open+0x157/0x280 security/security.c:1552 do_dentry_open+0x212/0x970 fs/open.c:784 vfs_open+0x62/0x80 fs/open.c:911 do_open fs/namei.c:3229 [inline] path_openat+0x1ff4/0x23d0 fs/namei.c:3346 do_filp_open+0x11e/0x1b0 fs/namei.c:3373 do_sys_openat2+0x52e/0x680 fs/open.c:1148 do_sys_open+0xa2/0x110 fs/open.c:1164 ksys_open include/linux/syscalls.h:1386 [inline] __do_sys_open fs/open.c:1170 [inline] __se_sys_open fs/open.c:1168 [inline] __x64_sys_open+0x50/0x60 fs/open.c:1168 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 26485 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================