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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read-write to 0xffff888172440b40 of 4 bytes by task 3780 on cpu 0:
 d_set_d_op+0xf4/0x1e0 fs/dcache.c:1931
 proc_lookup_de+0x1b9/0x210 fs/proc/generic.c:256
 proc_tgid_net_lookup+0x42/0xc0 fs/proc/proc_net.c:296
 lookup_open fs/namei.c:3455 [inline]
 open_last_lookups fs/namei.c:3546 [inline]
 path_openat+0xc6f/0x1d70 fs/namei.c:3776
 do_filp_open+0xf6/0x200 fs/namei.c:3809
 do_sys_openat2+0xab/0x110 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888172440b40 of 4 bytes by task 3764 on cpu 1:
 d_in_lookup include/linux/dcache.h:360 [inline]
 d_wait_lookup fs/dcache.c:2618 [inline]
 d_alloc_parallel+0x621/0xc90 fs/dcache.c:2706
 lookup_open fs/namei.c:3402 [inline]
 open_last_lookups fs/namei.c:3546 [inline]
 path_openat+0x658/0x1d70 fs/namei.c:3776
 do_filp_open+0xf6/0x200 fs/namei.c:3809
 do_sys_openat2+0xab/0x110 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x10000000 -> 0x1000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3764 Comm: syz-executor.0 Not tainted 6.7.0-rc2-syzkaller-00147-gf1a09972a45a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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