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BUG: KCSAN: data-race in attach_to_pi_owner / do_nanosleep

write to 0xffff88810ad25024 of 4 bytes by task 7044 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 do_nanosleep+0x127/0x320 kernel/time/hrtimer.c:1879
 hrtimer_nanosleep+0x136/0x230 kernel/time/hrtimer.c:1932
 __do_sys_nanosleep kernel/time/hrtimer.c:1966 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1953 [inline]
 __x64_sys_nanosleep+0x14b/0x190 kernel/time/hrtimer.c:1953
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810ad25024 of 4 bytes by task 24780 on cpu 0:
 attach_to_pi_owner+0x7f/0x560 kernel/futex.c:1233
 futex_lock_pi_atomic+0x23f/0x260 kernel/futex.c:1438
 futex_lock_pi+0x1c7/0x810 kernel/futex.c:2830
 do_futex+0x6a9/0x15b0 kernel/futex.c:3821
 __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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24780 Comm: syz-executor.3 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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