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BUG: KCSAN: data-race in __dentry_kill / __dentry_kill

write to 0xffff88811b529540 of 4 bytes by task 31284 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
 proc_invalidate_siblings_dcache+0x1d0/0x2b0 fs/proc/inode.c:143
 proc_flush_pid+0x1d/0x30 fs/proc/base.c:3481
 release_task+0x988/0xb60 kernel/exit.c:291
 wait_task_zombie kernel/exit.c:1281 [inline]
 wait_consider_task+0x1160/0x1670 kernel/exit.c:1508
 do_wait_thread kernel/exit.c:1571 [inline]
 __do_wait+0xf9/0x510 kernel/exit.c:1689
 do_wait+0xb6/0x230 kernel/exit.c:1723
 kernel_wait4+0x19f/0x210 kernel/exit.c:1882
 __do_sys_wait4 kernel/exit.c:1910 [inline]
 __se_sys_wait4 kernel/exit.c:1906 [inline]
 __x64_sys_wait4+0x91/0x120 kernel/exit.c:1906
 x64_sys_call+0x2aee/0x3020 arch/x86/include/generated/asm/syscalls_64.h:62
 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 0xffff88811b529540 of 4 bytes by task 1478 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
 proc_invalidate_siblings_dcache+0x1d0/0x2b0 fs/proc/inode.c:143
 proc_flush_pid+0x1d/0x30 fs/proc/base.c:3481
 release_task+0x988/0xb60 kernel/exit.c:291
 exit_notify kernel/exit.c:777 [inline]
 do_exit+0xda4/0x1530 kernel/exit.c:988
 do_group_exit+0xfe/0x140 kernel/exit.c:1119
 get_signal+0xe30/0xf20 kernel/signal.c:3037
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x6f/0x820 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x232/0x3b0 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: 1478 Comm: syz.1.9807 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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