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BUG: KCSAN: data-race in __send_signal / kernel_clone

write to 0xffff8881046b702c of 4 bytes by task 1760 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 wait_for_vfork_done kernel/fork.c:1278 [inline]
 kernel_clone+0x2e3/0x680 kernel/fork.c:2534
 __do_sys_clone kernel/fork.c:2620 [inline]
 __se_sys_clone kernel/fork.c:2604 [inline]
 __x64_sys_clone+0xb4/0xe0 kernel/fork.c:2604
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881046b702c of 4 bytes by task 9761 on cpu 0:
 __send_signal+0x282/0x760 kernel/signal.c:1138
 do_notify_parent+0x42c/0x4b0 kernel/signal.c:2034
 exit_notify kernel/exit.c:683 [inline]
 do_exit+0xc9a/0x1560 kernel/exit.c:846
 __do_sys_exit+0xb/0x10 kernel/exit.c:892
 __se_sys_exit+0x5/0x10 kernel/exit.c:890
 __x64_sys_exit+0x16/0x20 kernel/exit.c:890
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9761 Comm: syz-fuzzer Not tainted 5.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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