syzbot

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BUG: KCSAN: data-race in fsnotify / fsnotify_recalc_mask

write to 0xffff8881294d6ba8 of 4 bytes by task 13555 on cpu 1:
 __fsnotify_recalc_mask fs/notify/mark.c:132 [inline]
 fsnotify_recalc_mask+0x154/0x1b0 fs/notify/mark.c:147
 fanotify_add_mark+0x209/0x280 fs/notify/fanotify/fanotify_user.c:791
 do_fanotify_mark+0x92f/0x990 fs/notify/fanotify/fanotify_user.c:830
 __do_sys_fanotify_mark fs/notify/fanotify/fanotify_user.c:1180 [inline]
 __se_sys_fanotify_mark fs/notify/fanotify/fanotify_user.c:1176 [inline]
 __x64_sys_fanotify_mark+0x60/0x70 fs/notify/fanotify/fanotify_user.c:1176
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881294d6ba8 of 4 bytes by task 13558 on cpu 0:
 fsnotify+0x75/0x9e0 fs/notify/fsnotify.c:318
 fsnotify_name include/linux/fsnotify.h:38 [inline]
 fsnotify_dirent include/linux/fsnotify.h:44 [inline]
 fsnotify_create include/linux/fsnotify.h:191 [inline]
 vfs_symlink+0x2ad/0x2f0 fs/namei.c:3955
 do_symlinkat+0xee/0x280 fs/namei.c:3980
 __do_sys_symlink fs/namei.c:3999 [inline]
 __se_sys_symlink fs/namei.c:3997 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:3997
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13558 Comm: syz-executor.1 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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