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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

write to 0xffff88811ba72840 of 4 bytes by task 7101 on cpu 0:
 d_lru_del fs/dcache.c:504 [inline]
 __dentry_kill+0xa8/0x460 fs/dcache.c:665
 finish_dput+0x2b/0x200 fs/dcache.c:879
 dput+0x52/0x60 fs/dcache.c:928
 lookup_dcache fs/namei.c:1769 [inline]
 lookup_one_qstr_excl+0x233/0x250 fs/namei.c:1792
 __start_dirop fs/namei.c:2925 [inline]
 start_dirop fs/namei.c:2934 [inline]
 filename_create+0x155/0x220 fs/namei.c:4922
 filename_mknodat+0x13e/0x450 fs/namei.c:5130
 __do_sys_mknodat fs/namei.c:5173 [inline]
 __se_sys_mknodat+0x38/0xf0 fs/namei.c:5169
 __x64_sys_mknodat+0x55/0x70 fs/namei.c:5169
 x64_sys_call+0x312/0x3020 arch/x86/include/generated/asm/syscalls_64.h:260
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811ba72840 of 4 bytes by task 7104 on cpu 1:
 d_revalidate fs/namei.c:1029 [inline]
 lookup_fast+0xf0/0x320 fs/namei.c:1864
 lookup_fast_for_open fs/namei.c:4520 [inline]
 open_last_lookups fs/namei.c:4554 [inline]
 path_openat+0x436/0x2050 fs/namei.c:4827
 do_file_open+0x16c/0x290 fs/namei.c:4859
 do_sys_openat2+0x94/0x130 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1383
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00040007 -> 0x00004007

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7104 Comm: syz.2.1274 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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