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BUG: KCSAN: data-race in do_signal_stop / do_signal_stop

write to 0xffff888097178024 of 4 bytes by task 25965 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_signal_stop+0x562/0x6d0 kernel/signal.c:2395
 get_signal+0xb9a/0x1650 kernel/signal.c:2601
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x127/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:329
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888097178024 of 4 bytes by task 25915 on cpu 0:
 task_set_jobctl_pending kernel/signal.c:291 [inline]
 do_signal_stop+0x32e/0x6d0 kernel/signal.c:2354
 get_signal+0x10c8/0x1650 kernel/signal.c:2703
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x127/0x230 arch/x86/entry/common.c:246
 prepare_exit_to_usermode+0x5/0x20 arch/x86/entry/common.c:277
 idtentry_exit_cond_rcu+0xe/0x30 arch/x86/entry/common.c:649
 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:601

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25915 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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