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BUG: KCSAN: data-race in do_nanosleep / do_signal_stop

write to 0xffff88810558a02c of 4 bytes by task 7493 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_nanosleep+0x121/0x3d0 kernel/time/hrtimer.c:1896
 hrtimer_nanosleep_restart+0x57/0x80 kernel/time/hrtimer.c:1930
 __do_sys_restart_syscall+0x2d/0x40 kernel/signal.c:2921
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810558a02c of 4 bytes by task 7489 on cpu 0:
 task_set_jobctl_pending kernel/signal.c:291 [inline]
 do_signal_stop+0x33e/0x710 kernel/signal.c:2355
 get_signal+0xa06/0x15d0 kernel/signal.c:2733
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x104/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7489 Comm: syz-executor.3 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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