syzbot

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BUG: KCSAN: data-race in __dentry_kill / __dentry_kill

write to 0xffff8881198f2f00 of 4 bytes by task 3313 on cpu 0:
 d_lru_del fs/dcache.c:503 [inline]
 __dentry_kill+0xa8/0x4b0 fs/dcache.c:664
 dput+0x5e/0xd0 fs/dcache.c:911
 proc_invalidate_siblings_dcache+0x1c8/0x2a0 fs/proc/inode.c:143
 proc_flush_pid+0x1d/0x30 fs/proc/base.c:3484
 release_task+0x992/0xb60 kernel/exit.c:292
 wait_task_zombie kernel/exit.c:1266 [inline]
 wait_consider_task+0x113f/0x1650 kernel/exit.c:1493
 do_wait_thread kernel/exit.c:1556 [inline]
 __do_wait+0xfa/0x510 kernel/exit.c:1674
 do_wait+0xb7/0x260 kernel/exit.c:1708
 kernel_wait4+0x16b/0x1e0 kernel/exit.c:1867
 __do_sys_wait4 kernel/exit.c:1895 [inline]
 __se_sys_wait4 kernel/exit.c:1891 [inline]
 __x64_sys_wait4+0x91/0x120 kernel/exit.c:1891
 x64_sys_call+0x26c8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:62
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881198f2f00 of 4 bytes by task 16620 on cpu 1:
 dentry_unlist fs/dcache.c:639 [inline]
 __dentry_kill+0x2aa/0x4b0 fs/dcache.c:683
 dput+0x5e/0xd0 fs/dcache.c:911
 proc_invalidate_siblings_dcache+0x1c8/0x2a0 fs/proc/inode.c:143
 proc_flush_pid+0x1d/0x30 fs/proc/base.c:3484
 release_task+0x992/0xb60 kernel/exit.c:292
 exit_notify kernel/exit.c:782 [inline]
 do_exit+0xd85/0x1590 kernel/exit.c:975
 do_group_exit+0xff/0x140 kernel/exit.c:1104
 get_signal+0xe59/0xf70 kernel/signal.c:3034
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0014000c -> 0x0000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 16620 Comm: syz.4.17497 Tainted: G        W           6.16.0-rc1-syzkaller-00157-g02adc1490e6d #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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