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BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

read to 0xffff88803ff0d010 of 8 bytes by interrupt on cpu 0:
 wants_signal kernel/signal.c:978 [inline]
 complete_signal+0xcd/0x5e0 kernel/signal.c:995
 send_sigqueue+0x2cf/0x4b0 kernel/signal.c:1879
 posix_timer_event kernel/time/posix-timers.c:328 [inline]
 posix_timer_fn+0x10d/0x230 kernel/time/posix-timers.c:354
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829

write to 0xffff88803ff0d010 of 8 bytes by task 17514 on cpu 1:
 futex_wait_queue_me+0x1f8/0x290 kernel/futex.c:2706
 futex_wait+0x19b/0x3f0 kernel/futex.c:2810
 futex_wait_restart+0xc5/0x100 kernel/futex.c:2862
 __ia32_sys_restart_syscall+0x3a/0x50 kernel/signal.c:2870
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17514 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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