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BUG: KCSAN: data-race in dput / select_collect

write to 0xffff88801576e6c0 of 4 bytes by task 8484 on cpu 1:
 d_lru_del fs/dcache.c:410 [inline]
 select_collect+0xaf/0x2a0 fs/dcache.c:1505
 d_walk+0x298/0x4c0 fs/dcache.c:1326
 shrink_dcache_parent+0x85/0x3c0 fs/dcache.c:1565
 d_invalidate+0x70/0x1b0 fs/dcache.c:1677
 proc_invalidate_siblings_dcache+0x1e3/0x2d0 fs/proc/inode.c:150
 proc_flush_pid+0x16/0x20 fs/proc/base.c:3326
 release_task+0xb01/0xd30 kernel/exit.c:221
 wait_task_zombie kernel/exit.c:1105 [inline]
 wait_consider_task+0xf89/0x1820 kernel/exit.c:1332
 do_wait_thread kernel/exit.c:1395 [inline]
 do_wait+0x1b1/0x4e0 kernel/exit.c:1466
 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1628
 __do_sys_wait4 kernel/exit.c:1656 [inline]
 __se_sys_wait4 kernel/exit.c:1652 [inline]
 __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1652
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801576e6c0 of 4 bytes by task 29031 on cpu 0:
 fast_dput fs/dcache.c:746 [inline]
 dput+0x2f/0x420 fs/dcache.c:865
 proc_invalidate_siblings_dcache+0x1eb/0x2d0 fs/proc/inode.c:151
 proc_flush_pid+0x16/0x20 fs/proc/base.c:3326
 release_task+0xc1e/0xd30 kernel/exit.c:221
 exit_notify kernel/exit.c:698 [inline]
 do_exit+0xeb1/0x1630 kernel/exit.c:843
 do_group_exit+0xc8/0x170 kernel/exit.c:920
 get_signal+0xd5e/0x1440 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29031 Comm: syz-executor.5 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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