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BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me

write to 0xffff88812ae04024 of 4 bytes by task 8906 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:2631
 futex_wait+0x17e/0x3a0 kernel/futex.c:2737
 do_futex+0xe2/0x15b0 kernel/futex.c:3808
 __do_sys_futex kernel/futex.c:3869 [inline]
 __se_sys_futex kernel/futex.c:3837 [inline]
 __x64_sys_futex+0x2dc/0x410 kernel/futex.c:3837
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812ae04024 of 4 bytes by task 8905 on cpu 1:
 wants_signal kernel/signal.c:977 [inline]
 complete_signal+0x85/0x5c0 kernel/signal.c:1000
 __send_signal+0x675/0x8a0 kernel/signal.c:1180
 send_signal+0x211/0x2a0 kernel/signal.c:1241
 do_send_sig_info+0x59/0xc0 kernel/signal.c:1290
 do_send_specific+0xd8/0x100 kernel/signal.c:3780
 do_tkill+0xf8/0x130 kernel/signal.c:3806
 __do_sys_tgkill kernel/signal.c:3825 [inline]
 __se_sys_tgkill kernel/signal.c:3819 [inline]
 __x64_sys_tgkill+0x6d/0x90 kernel/signal.c:3819
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8905 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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