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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read-write to 0xffff88814f274600 of 4 bytes by task 27605 on cpu 0:
 d_set_d_op+0xf4/0x1e0 fs/dcache.c:1931
 proc_ns_instantiate fs/proc/namespaces.c:114 [inline]
 proc_ns_dir_lookup+0x180/0x220 fs/proc/namespaces.c:172
 lookup_open fs/namei.c:3473 [inline]
 open_last_lookups fs/namei.c:3563 [inline]
 path_openat+0xc4f/0x1d10 fs/namei.c:3793
 do_filp_open+0xf6/0x200 fs/namei.c:3823
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 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 0xffff88814f274600 of 4 bytes by task 27603 on cpu 1:
 d_in_lookup include/linux/dcache.h:359 [inline]
 d_wait_lookup fs/dcache.c:2618 [inline]
 d_alloc_parallel+0x621/0xc90 fs/dcache.c:2706
 lookup_open fs/namei.c:3420 [inline]
 open_last_lookups fs/namei.c:3563 [inline]
 path_openat+0x662/0x1d10 fs/namei.c:3793
 do_filp_open+0xf6/0x200 fs/namei.c:3823
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 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 -> 0x1000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27603 Comm: syz-executor.3 Not tainted 6.5.0-syzkaller-11329-g708283abf896 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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