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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

write to 0xffff8881256caf00 of 4 bytes by task 9269 on cpu 0:
 dentry_unlist fs/dcache.c:519 [inline]
 __dentry_kill+0x127/0x3b0 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x399/0x700 fs/dcache.c:859
 path_put_conditional fs/namei.c:863 [inline]
 follow_managed+0x205/0x720 fs/namei.c:1359
 walk_component+0x525/0x9a0 fs/namei.c:1921
 lookup_last fs/namei.c:2391 [inline]
 path_lookupat.isra.0+0x129/0x2e0 fs/namei.c:2436
 filename_lookup+0x145/0x2b0 fs/namei.c:2466
 user_path_at_empty+0x47/0x60 fs/namei.c:2746
 user_path_at include/linux/namei.h:58 [inline]
 vfs_statx+0xdb/0x190 fs/stat.c:197
 vfs_stat include/linux/fs.h:3271 [inline]
 __do_sys_newstat+0x50/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x37/0x50 fs/stat.c:347
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881256caf00 of 4 bytes by task 9270 on cpu 1:
 d_revalidate fs/namei.c:765 [inline]
 lookup_fast+0x1cd/0x6e0 fs/namei.c:1690
 walk_component+0x73/0x9a0 fs/namei.c:1911
 lookup_last fs/namei.c:2391 [inline]
 path_lookupat.isra.0+0x129/0x2e0 fs/namei.c:2436
 filename_lookup+0x145/0x2b0 fs/namei.c:2466
 user_path_at_empty+0x47/0x60 fs/namei.c:2746
 user_path_at include/linux/namei.h:58 [inline]
 vfs_statx+0xdb/0x190 fs/stat.c:197
 vfs_stat include/linux/fs.h:3271 [inline]
 __do_sys_newstat+0x50/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x37/0x50 fs/stat.c:347
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9270 Comm: modprobe Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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