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BUG: KCSAN: data-race in do_group_exit / exit_signals

write to 0xffff888100c44574 of 4 bytes by task 30062 on cpu 1:
 do_group_exit+0x136/0x1a0 kernel/exit.c:916
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100c44574 of 4 bytes by task 30094 on cpu 0:
 signal_group_exit include/linux/sched/signal.h:269 [inline]
 exit_signals+0x8f/0x4a0 kernel/signal.c:2872
 do_exit+0x194/0x1560 kernel/exit.c:781
 __seccomp_filter+0xe8e/0xe90 kernel/seccomp.c:1271
 __secure_computing+0xfb/0x140 kernel/seccomp.c:1309
 syscall_trace_enter+0x120/0x290 kernel/entry/common.c:67
 __syscall_enter_from_user_work kernel/entry/common.c:89 [inline]
 syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:107
 do_syscall_64+0x11/0x50 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30094 Comm: syz-executor.5 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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