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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888106449b50 of 8 bytes by task 3001 on cpu 1:
 __d_drop fs/dcache.c:531 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:623
 dput+0x5c/0xd0 fs/dcache.c:867
 handle_mounts fs/namei.c:1638 [inline]
 step_into+0x21a/0x840 fs/namei.c:1950
 walk_component+0x169/0x230 fs/namei.c:2118
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2634
 filename_lookup+0x2e0/0x340 fs/namei.c:2665
 do_readlinkat+0x89/0x210 fs/stat.c:562
 __do_sys_readlink fs/stat.c:599 [inline]
 __se_sys_readlink fs/stat.c:596 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:596
 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 0xffff888106449b50 of 8 bytes by task 3292 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:354 [inline]
 retain_dentry fs/dcache.c:708 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:804
 dput+0x24/0xd0 fs/dcache.c:861
 do_unlinkat+0x258/0x4d0 fs/namei.c:4590
 __do_sys_unlink fs/namei.c:4635 [inline]
 __se_sys_unlink fs/namei.c:4633 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4633
 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: 0xffff8882377c9c08 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3292 Comm: udevd Not tainted 6.13.0-rc5-syzkaller-00006-g56e6a3499e14 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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