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BUG: KCSAN: data-race in __dentry_kill / d_set_d_op

read to 0xffff8881254d9480 of 4 bytes by task 16082 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
 __lookup_slow+0x271/0x2a0 fs/namei.c:1666
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe70 fs/namei.c:1800
 lookup_last fs/namei.c:2263 [inline]
 path_lookupat.isra.0+0x13a/0x5a0 fs/namei.c:2308
 filename_lookup+0x145/0x2b0 fs/namei.c:2338
 user_path_at_empty+0x4c/0x70 fs/namei.c:2598
 user_path_at include/linux/namei.h:49 [inline]
 vfs_statx+0xd9/0x190 fs/stat.c:187
 vfs_stat include/linux/fs.h:3242 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:337
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881254d9480 of 4 bytes by task 16293 on cpu 1:
 d_set_d_op+0x10c/0x230 fs/dcache.c:1850
 proc_pid_instantiate+0xdc/0x110 fs/proc/base.c:3238
 proc_pid_lookup+0xa6/0x100 fs/proc/base.c:3262
 proc_root_lookup+0x2e/0x70 fs/proc/root.c:248
 __lookup_slow+0x129/0x2a0 fs/namei.c:1663
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe70 fs/namei.c:1800
 link_path_walk.part.0+0x354/0xa90 fs/namei.c:2128
 link_path_walk fs/namei.c:2062 [inline]
 path_openat+0x14f/0x36e0 fs/namei.c:3524
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 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/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16293 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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