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BUG: KCSAN: data-race in ns_capable / prepare_signal

read-write to 0xffff88810d316024 of 4 bytes by task 24729 on cpu 0:
 ns_capable_common kernel/capability.c:377 [inline]
 ns_capable+0x79/0xa0 kernel/capability.c:396
 inet6_create+0x225/0x720 net/ipv6/af_inet6.c:172
 __sock_create+0x2cc/0x4f0 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0xb0/0x200 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x3b/0x50 net/socket.c:1527
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810d316024 of 4 bytes by task 24740 on cpu 1:
 sig_task_ignored kernel/signal.c:94 [inline]
 sig_ignored kernel/signal.c:119 [inline]
 prepare_signal+0x891/0xda0 kernel/signal.c:962
 __send_signal+0x64/0x780 kernel/signal.c:1082
 send_signal+0x39f/0x3d0 kernel/signal.c:1242
 do_send_sig_info+0x9b/0xe0 kernel/signal.c:1291
 do_send_specific kernel/signal.c:3799 [inline]
 do_tkill kernel/signal.c:3825 [inline]
 __do_sys_tkill kernel/signal.c:3860 [inline]
 __se_sys_tkill+0x12b/0x180 kernel/signal.c:3854
 __x64_sys_tkill+0x2d/0x40 kernel/signal.c:3854
 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: 1 PID: 24740 Comm: syz-executor.3 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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