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BUG: KCSAN: data-race in __dentry_kill / d_set_d_op

read-write to 0xffff888122f91300 of 4 bytes by task 32748 on cpu 0:
 d_set_d_op+0xf4/0x1e0 fs/dcache.c:1932
 proc_pid_instantiate+0x17c/0x1a0 fs/proc/base.c:3431
 proc_pid_lookup+0x125/0x1c0 fs/proc/base.c:3463
 proc_root_lookup+0x1f/0x50 fs/proc/root.c:324
 __lookup_slow+0x17a/0x230 fs/namei.c:1690
 lookup_slow+0x3c/0x60 fs/namei.c:1707
 walk_component+0x1ec/0x230 fs/namei.c:1998
 link_path_walk+0x4b8/0x7e0 fs/namei.c:2322
 path_openat+0x1a1/0x1d10 fs/namei.c:3789
 do_filp_open+0xf6/0x200 fs/namei.c:3820
 do_sys_openat2+0xab/0x110 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888122f91300 of 4 bytes by task 3113 on cpu 1:
 dentry_unlist fs/dcache.c:572 [inline]
 __dentry_kill+0x237/0x4a0 fs/dcache.c:603
 dentry_kill+0x8d/0x1e0
 dput+0x118/0x1f0 fs/dcache.c:913
 proc_invalidate_siblings_dcache+0x1e3/0x2b0 fs/proc/inode.c:149
 proc_flush_pid+0x1d/0x20 fs/proc/base.c:3411
 release_task+0xa5b/0xb70 kernel/exit.c:279
 wait_task_zombie kernel/exit.c:1210 [inline]
 wait_consider_task+0x115e/0x1670 kernel/exit.c:1437
 do_wait_thread kernel/exit.c:1500 [inline]
 do_wait+0x183/0x650 kernel/exit.c:1617
 kernel_wait4+0x15f/0x1c0 kernel/exit.c:1780
 __do_sys_wait4 kernel/exit.c:1808 [inline]
 __se_sys_wait4 kernel/exit.c:1804 [inline]
 __x64_sys_wait4+0x94/0x120 kernel/exit.c:1804
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x10000000 -> 0x0020000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3113 Comm: syz-executor.1 Not tainted 6.5.0-rc7-syzkaller-00004-gf7757129e3de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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