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BUG: KCSAN: data-race in __dentry_kill / shrink_dentry_list

read-write to 0xffff888140159480 of 4 bytes by task 3110 on cpu 0:
 d_shrink_del fs/dcache.c:449 [inline]
 shrink_dentry_list+0x19f/0x3e0 fs/dcache.c:1074
 shrink_dcache_parent+0x43/0x1b0
 d_invalidate+0xa6/0x1c0 fs/dcache.c:1592
 proc_invalidate_siblings_dcache+0x1db/0x2b0 fs/proc/inode.c:142
 proc_flush_pid+0x1d/0x20 fs/proc/base.c:3419
 release_task+0xae6/0xc20 kernel/exit.c:282
 wait_task_zombie kernel/exit.c:1182 [inline]
 wait_consider_task+0x1165/0x1670 kernel/exit.c:1409
 do_wait_thread kernel/exit.c:1472 [inline]
 __do_wait+0xff/0x4f0 kernel/exit.c:1590
 do_wait+0xae/0x270 kernel/exit.c:1624
 kernel_wait4+0x15f/0x1c0 kernel/exit.c:1783
 __do_sys_wait4 kernel/exit.c:1811 [inline]
 __se_sys_wait4 kernel/exit.c:1807 [inline]
 __x64_sys_wait4+0x94/0x120 kernel/exit.c:1807
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888140159480 of 4 bytes by task 11346 on cpu 1:
 dentry_unlist fs/dcache.c:573 [inline]
 __dentry_kill+0x29d/0x4a0 fs/dcache.c:617
 dput+0x54/0xc0 fs/dcache.c:845
 proc_invalidate_siblings_dcache+0x1e3/0x2b0 fs/proc/inode.c:143
 proc_flush_pid+0x1d/0x20 fs/proc/base.c:3419
 release_task+0xb8d/0xc20 kernel/exit.c:282
 exit_notify kernel/exit.c:767 [inline]
 do_exit+0xf09/0x16d0 kernel/exit.c:891
 do_group_exit+0x101/0x150 kernel/exit.c:1020
 get_signal+0xf4e/0x10a0 kernel/signal.c:2893
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x58/0x120 kernel/entry/common.c:212
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0048040c -> 0x0000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11346 Comm: syz-executor.2 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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