kern/51995: ptrace(2) PT_RESUME is not reliable

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>Number:         51995
>Category:       kern
>Synopsis:       ptrace(2) PT_RESUME is not reliable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 23 04:35:00 +0000 2017
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.62 amd64
>Organization:
TNF
>Environment:
NetBSD chieftec 7.99.62 NetBSD 7.99.61 (GENERIC) #3: Thu Feb 23 02:56:52 CET 2017  root@chieftec:/public/netbsd-root/sys/arch/amd64/compile/GENERIC amd64
>Description:
ptrace(2) operation PT_RESUME is not reliable in resuming the specified LWP
>How-To-Repeat:
$ cd /usr/tests/kernel/
$ atf-run t_ptrace_wait|atf-report
>Fix:
N/A