syzbot

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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff88811944e900 of 4 bytes by task 6052 on cpu 1:
 dentry_unlist fs/dcache.c:570 [inline]
 __dentry_kill+0x22e/0x4c0 fs/dcache.c:639
 dput+0x5c/0xd0 fs/dcache.c:867
 do_renameat2+0x748/0xa70 fs/namei.c:5226
 __do_sys_rename fs/namei.c:5271 [inline]
 __se_sys_rename fs/namei.c:5269 [inline]
 __x64_sys_rename+0x58/0x70 fs/namei.c:5269
 x64_sys_call+0x2b1c/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:83
 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 0xffff88811944e900 of 4 bytes by task 3609 on cpu 0:
 d_revalidate fs/namei.c:926 [inline]
 lookup_fast+0xd9/0x2a0 fs/namei.c:1740
 walk_component+0x3f/0x230 fs/namei.c:2108
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2634
 filename_lookup+0x150/0x340 fs/namei.c:2663
 user_path_at+0x3c/0x120 fs/namei.c:3070
 do_utimes_path fs/utimes.c:95 [inline]
 do_utimes+0xc7/0x1f0 fs/utimes.c:140
 __do_sys_utimensat fs/utimes.c:159 [inline]
 __se_sys_utimensat fs/utimes.c:143 [inline]
 __x64_sys_utimensat+0xc6/0x170 fs/utimes.c:143
 x64_sys_call+0x272a/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:281
 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: 0x00600108 -> 0x00008108

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3609 Comm: udevd Not tainted 6.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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