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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff8881061ea190 of 8 bytes by task 3466 on cpu 0:
 __d_drop fs/dcache.c:549 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:641
 shrink_kill fs/dcache.c:1088 [inline]
 shrink_dentry_list+0x1bc/0x3e0 fs/dcache.c:1115
 shrink_dcache_parent+0x43/0x1b0
 d_invalidate+0xa9/0x1c0 fs/dcache.c:1632
 lookup_fast+0x29e/0x320 fs/namei.c:1758
 walk_component fs/namei.c:2110 [inline]
 link_path_walk+0x472/0x830 fs/namei.c:2479
 path_openat+0x1af/0x1fc0 fs/namei.c:3985
 do_filp_open+0x107/0x230 fs/namei.c:4016
 do_sys_openat2+0xab/0x120 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1453
 x64_sys_call+0x2b30/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:258
 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 0xffff8881061ea190 of 8 bytes by task 3465 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
 handle_mounts fs/namei.c:1639 [inline]
 step_into+0x218/0x820 fs/namei.c:1952
 walk_component fs/namei.c:2120 [inline]
 link_path_walk+0x50e/0x830 fs/namei.c:2479
 path_openat+0x1af/0x1fc0 fs/namei.c:3985
 do_filp_open+0x107/0x230 fs/namei.c:4016
 do_sys_openat2+0xab/0x120 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1453
 x64_sys_call+0x2b30/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0xffff888237b94738 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3465 Comm: udevd Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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