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BUG: KCSAN: data-race in copy_process / task_dump_owner

write to 0xffff8881397c702c of 4 bytes by task 23404 on cpu 1:
 copy_process+0x5b4/0x2e00 kernel/fork.c:1971
 kernel_clone+0x14b/0x690 kernel/fork.c:2462
 __do_sys_clone kernel/fork.c:2579 [inline]
 __se_sys_clone kernel/fork.c:2563 [inline]
 __x64_sys_clone+0xc8/0xf0 kernel/fork.c:2563
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881397c702c of 4 bytes by task 23416 on cpu 0:
 task_dump_owner+0x2b/0x1b0 fs/proc/base.c:1823
 pid_update_inode fs/proc/base.c:1965 [inline]
 proc_pident_instantiate+0x138/0x190 fs/proc/base.c:2618
 proc_pident_lookup fs/proc/base.c:2642 [inline]
 proc_tgid_base_lookup+0x10c/0x180 fs/proc/base.c:3293
 lookup_open fs/namei.c:3085 [inline]
 open_last_lookups fs/namei.c:3180 [inline]
 path_openat+0xa72/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1199
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23416 Comm: syz-executor.4 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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