Re: port-evbarm/55504: evbarm-earmv7hf testbed hangs during sbin/ifconfig/t_repeated_updown test

[Andreas Gustafsson <gson%gson.org@localhost>]

The following reply was made to PR port-evbarm/55504; it has been noted by GNATS.

From: Andreas Gustafsson <gson%gson.org@localhost>
To: Jukka Ruohonen <jruohonen%iki.fi@localhost>, gnats-bugs%netbsd.org@localhost
Cc: martin%NetBSD.org@localhost
Subject: Re: port-evbarm/55504: evbarm-earmv7hf testbed hangs during
 sbin/ifconfig/t_repeated_updown test
Date: Fri, 24 Jul 2020 12:17:47 +0300

 Jukka Ruohonen wrote:
 >  The reason is likely the same as in PR kern/55466, i.e. not related to 
 >  this particular, simple test per se.
 
 I don't think the present bug is the same as PR kern/55466, as this
 one can in fact be triggered by running "this particular simple, test"
 only; no hung rump_server processes are involved or required.
 
 Using a system built from 2020.07.22.01.24.40 sources (which has
 t_repeated_updown 1.3) under qemu 5.0.0, running
 
   sysctl -w hw.cnmagic=+
   cd /usr/tests/sbin/ifconfig
   atf-run t_repeated_updown
 
 hangs after printing "smsh0 up":
 
   tc-start: 1595581029.664487, repeated_updown
   tc-so:Test 35: smsh0 down
   tc-so:Test 35: smsh0 up
 
 The system hangs hard such that typing the cnmagic character on the
 emulated serial console has no effect.
 
 Note that t_repeated_updown.sh 1.4 will no longer trigger the hang.
 Also, if the system is started with "anita --machine virt", it will
 have no shmh interface and therefore will not hang.
 -- 
 Andreas Gustafsson, gson%gson.org@localhost