syzbot

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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff88811ae19b40 of 4 bytes by task 9005 on cpu 1:
 dentry_unlist fs/dcache.c:615 [inline]
 __dentry_kill+0x1e2/0x460 fs/dcache.c:684
 finish_dput+0x2b/0x200 fs/dcache.c:879
 dput+0x52/0x60 fs/dcache.c:928
 end_dirop fs/namei.c:2954 [inline]
 filename_unlinkat+0x217/0x410 fs/namei.c:5549
 __do_sys_unlink fs/namei.c:5581 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5578
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5578
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff88811ae19b40 of 4 bytes by task 3002 on cpu 0:
 d_revalidate fs/namei.c:1029 [inline]
 lookup_fast+0xf0/0x320 fs/namei.c:1864
 walk_component fs/namei.c:2275 [inline]
 lookup_last fs/namei.c:2786 [inline]
 path_lookupat+0x15c/0x500 fs/namei.c:2810
 filename_lookup+0x190/0x390 fs/namei.c:2839
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x2b51/0x3020 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0x00300080 -> 0x00000080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3002 Comm: udevd 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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