syzbot

==================================================================
BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff888119186600 of 4 bytes by task 23188 on cpu 0:
 dentry_unlist fs/dcache.c:560 [inline]
 __dentry_kill+0x22e/0x4c0 fs/dcache.c:629
 dput+0x5c/0xd0 fs/dcache.c:857
 do_unlinkat+0x257/0x4c0 fs/namei.c:4536
 __do_sys_unlink fs/namei.c:4581 [inline]
 __se_sys_unlink fs/namei.c:4579 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4579
 x64_sys_call+0x280f/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888119186600 of 4 bytes by task 3015 on cpu 1:
 d_revalidate fs/namei.c:867 [inline]
 lookup_fast+0xd9/0x2a0 fs/namei.c:1681
 walk_component+0x3f/0x230 fs/namei.c:2049
 lookup_last fs/namei.c:2556 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2580
 filename_lookup+0x127/0x300 fs/namei.c:2609
 do_readlinkat+0x89/0x210 fs/stat.c:537
 __do_sys_readlink fs/stat.c:574 [inline]
 __se_sys_readlink fs/stat.c:571 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:571
 x64_sys_call+0x13c3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00600008 -> 0x00008008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3015 Comm: udevd Not tainted 6.12.0-rc6-syzkaller-00099-g7758b206117d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================