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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read-write to 0xffff88811e042240 of 4 bytes by task 4800 on cpu 1:
 d_set_d_op+0xf0/0x1e0 fs/dcache.c:1932
 proc_lookup_de+0x1d8/0x230 fs/proc/generic.c:257
 proc_tgid_net_lookup+0x3f/0xc0 fs/proc/proc_net.c:296
 lookup_open fs/namei.c:3391 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0xb2f/0x1b60 fs/namei.c:3711
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88811e042240 of 4 bytes by task 4801 on cpu 0:
 d_in_lookup include/linux/dcache.h:359 [inline]
 d_wait_lookup fs/dcache.c:2619 [inline]
 d_alloc_parallel+0x5f5/0xc30 fs/dcache.c:2707
 lookup_open fs/namei.c:3338 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x660/0x1b60 fs/namei.c:3711
 do_filp_open+0x1e0/0x220 fs/namei.c:3743
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 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: 4801 Comm: syz-executor.2 Not tainted 6.1.0-syzkaller-14587-g51094a24b85e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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