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BUG: KCSAN: data-race in do_signal_stop / futex_wait_queue_me

write to 0xffff888105db3064 of 4 bytes by task 12539 on cpu 0:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x186/0x250 kernel/futex.c:2634
 futex_wait+0x153/0x3a0 kernel/futex.c:2740
 do_futex+0x144a/0x21b0 kernel/futex.c:3811
 __do_sys_futex kernel/futex.c:3872 [inline]
 __se_sys_futex+0x26d/0x330 kernel/futex.c:3840
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3840
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888105db3064 of 4 bytes by task 12536 on cpu 1:
 task_set_jobctl_pending kernel/signal.c:291 [inline]
 do_signal_stop+0x30e/0x6a0 kernel/signal.c:2354
 get_signal+0x66a/0x1520 kernel/signal.c:2699
 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+0x129/0x230 arch/x86/entry/common.c:246
 prepare_exit_to_usermode+0x5/0x20 arch/x86/entry/common.c:277
 idtentry_exit_cond_rcu+0x24/0x80 arch/x86/entry/common.c:649
 sysvec_apic_timer_interrupt+0xe5/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12536 Comm: syz-executor.1 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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