syzbot

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BUG: KCSAN: data-race in fsnotify_perm / vfs_rmdir

write to 0xffff88810bee6d80 of 4 bytes by task 21804 on cpu 1:
 dont_mount include/linux/dcache.h:355 [inline]
 vfs_rmdir+0x1a6/0x2a0 fs/namei.c:3721
 do_rmdir+0x16e/0x300 fs/namei.c:3776
 __do_sys_rmdir fs/namei.c:3794 [inline]
 __se_sys_rmdir fs/namei.c:3792 [inline]
 __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3792
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810bee6d80 of 4 bytes by task 21801 on cpu 0:
 fsnotify_parent include/linux/fsnotify.h:60 [inline]
 fsnotify_file include/linux/fsnotify.h:90 [inline]
 fsnotify_perm+0x23f/0x2e0 include/linux/fsnotify.h:115
 security_file_permission+0x87/0xa0 security/security.c:1452
 iterate_dir+0x53/0x370 fs/readdir.c:50
 __do_sys_getdents fs/readdir.c:283 [inline]
 __se_sys_getdents+0x7f/0x190 fs/readdir.c:268
 __x64_sys_getdents+0x3f/0x50 fs/readdir.c:268
 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: 0 PID: 21801 Comm: systemd-udevd Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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