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BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

write to 0xffff88812235306c of 4 bytes by task 7603 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+0x198/0x260 kernel/futex.c:2606
 futex_wait+0x143/0x430 kernel/futex.c:2708
 do_futex+0x9e8/0x1e10 kernel/futex.c:3734
 __do_sys_futex kernel/futex.c:3797 [inline]
 __se_sys_futex+0x2a8/0x390 kernel/futex.c:3763
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3763
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812235306c of 4 bytes by interrupt on cpu 0:
 wants_signal kernel/signal.c:978 [inline]
 complete_signal+0x7c/0x600 kernel/signal.c:1001
 send_sigqueue+0x252/0x3e0 kernel/signal.c:1881
 posix_timer_event kernel/time/posix-timers.c:354 [inline]
 posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380
 __run_hrtimer+0x160/0x480 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
 finish_task_switch+0xda/0x290 kernel/sched/core.c:4193
 context_switch kernel/sched/core.c:4325 [inline]
 __schedule+0x427/0x5b0 kernel/sched/core.c:5073
 schedule+0x67/0x90 kernel/sched/core.c:5152
 schedule_hrtimeout_range_clock+0xed/0x1d0 kernel/time/hrtimer.c:2157
 schedule_hrtimeout_range+0x25/0x30 kernel/time/hrtimer.c:2202
 ep_poll fs/eventpoll.c:1842 [inline]
 do_epoll_wait+0xe80/0xf00 fs/eventpoll.c:2220
 do_epoll_pwait fs/eventpoll.c:2254 [inline]
 __do_sys_epoll_pwait fs/eventpoll.c:2267 [inline]
 __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2261
 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2261
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1751 Comm: syz-fuzzer Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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