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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888106808190 of 8 bytes by task 3246 on cpu 0:
 __d_drop fs/dcache.c:516 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:608
 dput+0x5c/0xd0 fs/dcache.c:852
 do_unlinkat+0x257/0x4c0 fs/namei.c:4489
 __do_sys_unlink fs/namei.c:4534 [inline]
 __se_sys_unlink fs/namei.c:4532 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4532
 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 0xffff888106808190 of 8 bytes by task 2960 on cpu 1:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:354 [inline]
 retain_dentry fs/dcache.c:693 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:789
 dput+0x24/0xd0 fs/dcache.c:846
 handle_mounts fs/namei.c:1579 [inline]
 step_into+0x21a/0x810 fs/namei.c:1877
 walk_component+0x169/0x230 fs/namei.c:2045
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2566
 filename_lookup+0x127/0x300 fs/namei.c:2595
 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: 0xffff8882374b6080 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2960 Comm: udevd Not tainted 6.11.0-rc4-syzkaller-00236-g60f0560f53e3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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