syzbot

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

write to 0xffff8881069fc6d0 of 8 bytes by task 2998 on cpu 0:
 __d_drop fs/dcache.c:549 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:641
 dput+0x5c/0xd0 fs/dcache.c:885
 path_put fs/namei.c:625 [inline]
 terminate_walk+0xfb/0x280 fs/namei.c:751
 path_lookupat+0x209/0x2b0 fs/namei.c:2653
 filename_lookup+0x150/0x340 fs/namei.c:2665
 do_readlinkat+0x89/0x210 fs/stat.c:564
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 x64_sys_call+0x28ba/0x2dc0 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

read to 0xffff8881069fc6d0 of 8 bytes by task 3290 on cpu 1:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:366 [inline]
 retain_dentry fs/dcache.c:726 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:822
 dput+0x24/0xd0 fs/dcache.c:879
 do_unlinkat+0x258/0x4d0 fs/namei.c:4592
 __do_sys_unlink fs/namei.c:4637 [inline]
 __se_sys_unlink fs/namei.c:4635 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4635
 x64_sys_call+0x2329/0x2dc0 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

value changed: 0xffff8882375185d8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3290 Comm: udevd Not tainted 6.14.0-rc1-syzkaller-00187-g8f6629c004b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================