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BUG: KCSAN: data-race in schedule_hrtimeout_range_clock / watchdog

write to 0xffff8881228b5050 of 8 bytes by task 7920 on cpu 0:
 schedule_hrtimeout_range_clock+0x14f/0x1f0 kernel/time/hrtimer.c:2137
 schedule_hrtimeout_range+0x30/0x50 kernel/time/hrtimer.c:2177
 poll_schedule_timeout.constprop.0+0x71/0xc0 fs/select.c:243
 do_select+0xd7e/0x1020 fs/select.c:603
 core_sys_select+0x2c7/0x5f0 fs/select.c:677
 do_pselect.constprop.0+0x125/0x160 fs/select.c:759
 __do_sys_pselect6 fs/select.c:784 [inline]
 __se_sys_pselect6 fs/select.c:769 [inline]
 __x64_sys_pselect6+0x12a/0x160 fs/select.c:769
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881228b5050 of 8 bytes by task 657 on cpu 1:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2b8/0x960 kernel/hung_task.c:289
 kthread+0x1cb/0x1f0 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 657 Comm: khungtaskd 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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