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BUG: KCSAN: data-race in ns_capable / task_dump_owner

write to 0xffff88812cc700ac of 4 bytes by task 6608 on cpu 1:
 ns_capable_common kernel/capability.c:377 [inline]
 ns_capable+0x86/0xb0 kernel/capability.c:396
 netlink_allowed net/netlink/af_netlink.c:921 [inline]
 netlink_sendmsg+0x3ba/0x7c0 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2433
 __do_sys_sendmsg net/socket.c:2442 [inline]
 __se_sys_sendmsg net/socket.c:2440 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2440
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812cc700ac of 4 bytes by task 1020 on cpu 0:
 task_dump_owner+0x2b/0x1d0 fs/proc/base.c:1822
 proc_pid_make_inode+0x1d6/0x200 fs/proc/base.c:1918
 proc_pident_instantiate+0x40/0x190 fs/proc/base.c:2605
 proc_pident_lookup fs/proc/base.c:2641 [inline]
 proc_tgid_base_lookup+0x10c/0x180 fs/proc/base.c:3292
 __lookup_slow+0x181/0x280 fs/namei.c:1630
 lookup_slow fs/namei.c:1647 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1943
 lookup_last fs/namei.c:2398 [inline]
 path_lookupat+0x12d/0x570 fs/namei.c:2422
 filename_lookup+0xff/0x390 fs/namei.c:2455
 user_path_at_empty+0x3b/0x50 fs/namei.c:2735
 do_readlinkat+0x87/0x200 fs/stat.c:417
 __do_sys_readlinkat fs/stat.c:444 [inline]
 __se_sys_readlinkat fs/stat.c:441 [inline]
 __x64_sys_readlinkat+0x4f/0x60 fs/stat.c:441
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1020 Comm: systemd-journal Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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