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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read-write to 0xffff88814b33c840 of 4 bytes by task 31275 on cpu 1:
 d_set_d_op+0xf4/0x1e0 fs/dcache.c:1932
 proc_lookup_de+0x1b9/0x210 fs/proc/generic.c:257
 proc_tgid_net_lookup+0x42/0xc0 fs/proc/proc_net.c:296
 lookup_open fs/namei.c:3394 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0xc43/0x1d00 fs/namei.c:3712
 do_filp_open+0xf6/0x200 fs/namei.c:3742
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1375
 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 0xffff88814b33c840 of 4 bytes by task 31265 on cpu 0:
 d_in_lookup include/linux/dcache.h:359 [inline]
 d_wait_lookup fs/dcache.c:2619 [inline]
 d_alloc_parallel+0x622/0xc90 fs/dcache.c:2707
 lookup_open fs/namei.c:3341 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0x65c/0x1d00 fs/namei.c:3712
 do_filp_open+0xf6/0x200 fs/namei.c:3742
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1375
 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: 0 PID: 31265 Comm: syz-executor.5 Not tainted 6.3.0-rc3-syzkaller-00005-g7d31677bb7b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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