syzbot

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BUG: KCSAN: data-race in __dentry_kill / __dentry_kill

write to 0xffff88811b538780 of 4 bytes by task 2980 on cpu 0:
 d_lru_del fs/dcache.c:513 [inline]
 __dentry_kill+0xab/0x4d0 fs/dcache.c:713
 finish_dput+0x2b/0x200 fs/dcache.c:927
 dput+0x52/0x60 fs/dcache.c:976
 lookup_fast+0x29e/0x320 fs/namei.c:1881
 walk_component fs/namei.c:2274 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x15c/0x500 fs/namei.c:2809
 filename_lookup+0x190/0x390 fs/namei.c:2838
 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/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b538780 of 4 bytes by task 5203 on cpu 1:
 dentry_unlist fs/dcache.c:688 [inline]
 __dentry_kill+0x28d/0x4d0 fs/dcache.c:732
 finish_dput+0x2b/0x200 fs/dcache.c:927
 dput+0x52/0x60 fs/dcache.c:976
 lookup_fast+0x29e/0x320 fs/namei.c:1881
 walk_component fs/namei.c:2274 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x15c/0x500 fs/namei.c:2809
 filename_lookup+0x190/0x390 fs/namei.c:2838
 vfs_statx+0x96/0x170 fs/stat.c:353
 vfs_fstatat+0x118/0x170 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532
 x64_sys_call+0x2c64/0x3020 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00140004 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5203 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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