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BUG: KCSAN: data-race in __dentry_kill / d_set_d_op

read to 0xffff88812524d300 of 4 bytes by task 8068 on cpu 0:
 dentry_unlist fs/dcache.c:544 [inline]
 __dentry_kill+0x1be/0x3c0 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x3b5/0x750 fs/dcache.c:859
 path_put_conditional fs/namei.c:821 [inline]
 follow_managed+0x1eb/0x6f0 fs/namei.c:1279
 do_last fs/namei.c:3368 [inline]
 path_openat+0xda4/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812524d300 of 4 bytes by task 7966 on cpu 1:
 d_set_d_op+0x17b/0x230 fs/dcache.c:1856
 simple_lookup fs/libfs.c:70 [inline]
 simple_lookup+0xaa/0xb0 fs/libfs.c:65
 lookup_open fs/namei.c:3220 [inline]
 do_last fs/namei.c:3331 [inline]
 path_openat+0x16f9/0x3580 fs/namei.c:3537
 do_filp_open+0x11e/0x1b0 fs/namei.c:3567
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7966 Comm: udevd Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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