syzbot

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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff888106a72240 of 4 bytes by task 16413 on cpu 1:
 dentry_unlist fs/dcache.c:555 [inline]
 __dentry_kill+0x22e/0x4c0 fs/dcache.c:624
 dput+0x5c/0xd0 fs/dcache.c:852
 path_put fs/namei.c:568 [inline]
 terminate_walk+0xfb/0x280 fs/namei.c:692
 path_openat+0x1979/0x1f10 fs/namei.c:3887
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1ac/0x2e00 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 0xffff888106a72240 of 4 bytes by task 16412 on cpu 0:
 d_revalidate fs/namei.c:867 [inline]
 lookup_fast+0xd9/0x2a0 fs/namei.c:1667
 open_last_lookups fs/namei.c:3615 [inline]
 path_openat+0x466/0x1f10 fs/namei.c:3883
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1ac/0x2e00 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: 0x0040000c -> 0x0000800c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16412 Comm: syz.4.3635 Not tainted 6.10.0-syzkaller-09061-g4305ca0087dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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