kern/55152: panic: kernel diagnostic assertion "(code != TRAP_CHLD) || (entity > 1)" failed

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

>Number:         55152
>Category:       kern
>Synopsis:       panic: kernel diagnostic assertion "(code != TRAP_CHLD) || (entity > 1)" failed
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 07 19:25:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

i386 test runs on the TNF testbed are now panicing with

  panic: kernel diagnostic assertion "(code != TRAP_CHLD) || (entity > 1)" failed

during the tracer_sysctl_lookup_without_duplicates test case.

Logs:

  http://releng.netbsd.org/b5reports/i386/commits-2020.04.html#2020.04.06.19.26.00

>How-To-Repeat:

>Fix: