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BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

write to 0xffff88812210a0a4 of 4 bytes by task 14339 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+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 0xffff88812210a0a4 of 4 bytes by interrupt on cpu 1:
 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
 count_vm_event include/linux/vmstat.h:68 [inline]
 handle_mm_fault+0x59/0x540 mm/memory.c:4179
 do_user_addr_fault arch/x86/mm/fault.c:1442 [inline]
 do_page_fault+0x4a4/0xa52 arch/x86/mm/fault.c:1517
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14408 Comm: syz-executor.5 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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