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BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

write to 0xffff888106395024 of 4 bytes by task 10457 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x17d/0x290 kernel/futex.c:2705
 futex_wait+0x17e/0x400 kernel/futex.c:2811
 do_futex+0xe2/0x1820 kernel/futex.c:3882
 __do_sys_futex kernel/futex.c:3943 [inline]
 __se_sys_futex kernel/futex.c:3911 [inline]
 __x64_sys_futex+0x2dc/0x410 kernel/futex.c:3911
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888106395024 of 4 bytes by interrupt on cpu 0:
 wants_signal kernel/signal.c:972 [inline]
 complete_signal+0x85/0x5c0 kernel/signal.c:995
 send_sigqueue+0x30c/0x500 kernel/signal.c:1879
 posix_timer_event kernel/time/posix-timers.c:353 [inline]
 posix_timer_fn+0x104/0x220 kernel/time/posix-timers.c:379
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 arch_local_irq_enable arch/x86/include/asm/paravirt.h:762 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
 finish_lock_switch kernel/sched/core.c:3173 [inline]
 finish_task_switch+0x7b/0x260 kernel/sched/core.c:3273
 context_switch kernel/sched/core.c:3437 [inline]
 __schedule+0x30e/0x690 kernel/sched/core.c:4130
 schedule+0x41/0xe0 kernel/sched/core.c:4204
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x138/0x320 kernel/time/hrtimer.c:1874
 hrtimer_nanosleep+0x136/0x230 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x14b/0x190 kernel/time/hrtimer.c:1948
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9979 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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