syzbot

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BUG: KCSAN: data-race in ns_capable / task_dump_owner

read-write to 0xffff888102a4902c of 4 bytes by task 4946 on cpu 1:
 ns_capable_common kernel/capability.c:377 [inline]
 ns_capable+0x79/0xa0 kernel/capability.c:396
 netlink_allowed net/netlink/af_netlink.c:913 [inline]
 netlink_sendmsg+0x3ba/0x7c0 net/netlink/af_netlink.c:1873
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg net/socket.c:2439 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2439
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888102a4902c of 4 bytes by task 4883 on cpu 0:
 task_dump_owner+0x2b/0x1b0 fs/proc/base.c:1823
 proc_pid_make_inode+0x1b9/0x1e0 fs/proc/base.c:1919
 proc_pident_instantiate+0x40/0x180 fs/proc/base.c:2606
 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+0xb8f/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 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: 4883 Comm: systemd-journal Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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