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BUG: KCSAN: data-race in attach_to_pi_owner / futex_wait_queue_me

write to 0xffff888120da8064 of 4 bytes by task 14337 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 futex_wait_queue_me+0x1a2/0x290 kernel/futex.c:2705
 futex_wait_requeue_pi.constprop.0+0x2d0/0xa10 kernel/futex.c:3352
 do_futex+0x1cc/0x18d0 kernel/futex.c:3902
 __do_sys_futex kernel/futex.c:3943 [inline]
 __se_sys_futex kernel/futex.c:3911 [inline]
 __x64_sys_futex+0x2cd/0x3f0 kernel/futex.c:3911
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888120da8064 of 4 bytes by task 14343 on cpu 1:
 attach_to_pi_owner+0x84/0x580 kernel/futex.c:1291
 lookup_pi_state kernel/futex.c:1378 [inline]
 futex_requeue+0x1067/0x1360 kernel/futex.c:2139
 do_futex+0x2f7/0x18d0 kernel/futex.c:3905
 __do_sys_futex kernel/futex.c:3943 [inline]
 __se_sys_futex kernel/futex.c:3911 [inline]
 __x64_sys_futex+0x2cd/0x3f0 kernel/futex.c:3911
 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: 14343 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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