lib/53048: timeleft__lwp_park test case fails

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         53048
>Category:       lib
>Synopsis:       timeleft__lwp_park test case fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 23 08:55:01 +0000 2018
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2017.12.08.01.19.29
>Organization:

>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The timeleft__lwp_park test case of the t_timeleft test has
failed in almost every run the TNF testbed since it was added on
2017.12.08.01.19.29, on at least amd64 and i386.  For example:

  http://releng.netbsd.org/b5reports/amd64/2018/2018.02.22.05.23.55/test.html#kernel_t_timeleft_timeleft__lwp_park

This is not a qemu timing issue, because it has also failed in almost
every run on my own amd64 testbed using physical hardware, for
example:

  http://www.gson.org/netbsd/bugs/build/amd64-baremetal/2018/2018.02.18.15.29.29/test.html#kernel_t_timeleft_timeleft__lwp_park

>How-To-Repeat:

Inspect test logs.

>Fix: