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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888106b20e50 of 8 bytes by task 4388 on cpu 0:
 __d_drop fs/dcache.c:509 [inline]
 __dentry_kill+0x135/0x4a0 fs/dcache.c:601
 dput+0x54/0xc0 fs/dcache.c:845
 do_unlinkat+0x257/0x4c0 fs/namei.c:4401
 __do_sys_unlink fs/namei.c:4446 [inline]
 __se_sys_unlink fs/namei.c:4444 [inline]
 __x64_sys_unlink+0x30/0x40 fs/namei.c:4444
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888106b20e50 of 8 bytes by task 2764 on cpu 1:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:341 [inline]
 retain_dentry fs/dcache.c:686 [inline]
 fast_dput+0x62/0x2b0 fs/dcache.c:782
 dput+0x24/0xc0 fs/dcache.c:839
 handle_mounts fs/namei.c:1554 [inline]
 step_into+0x21a/0x800 fs/namei.c:1839
 walk_component+0x164/0x230 fs/namei.c:2007
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x10a/0x2a0 fs/namei.c:2482
 filename_lookup+0x126/0x300 fs/namei.c:2511
 user_path_at_empty+0x42/0x110 fs/namei.c:2920
 do_readlinkat+0x92/0x210 fs/stat.c:499
 __do_sys_readlink fs/stat.c:532 [inline]
 __se_sys_readlink fs/stat.c:529 [inline]
 __x64_sys_readlink+0x47/0x50 fs/stat.c:529
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0xffff88823771e0e0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2764 Comm: udevd Not tainted 6.7.0-syzkaller-13004-g4fbbed787267 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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