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Re: port-mips/52892: Tests hang on MIPS

The following reply was made to PR port-mips/52892; it has been noted by GNATS.

From: Andreas Gustafsson <>
Subject: Re: port-mips/52892: Tests hang on MIPS
Date: Thu, 19 Apr 2018 15:40:41 +0300

 I have now looked into this some more, and have the following
 1. The tests are still hanging every time on b5:
 2. I can reliably reproduce the hang on hpcmips under gxemul
 by running
   cd /usr/tests/net/icmp
   while true; do atf-run t_ping|atf-report; done
 On b5, this usually hangs within an hour, but on my own test machine,
 it took a day or two to hang.
 3. It's the kernel that's hanging, not just ATF.  For example, if I
 run the above test script in the background with output redirected to
 a log file, and "tail -f" the log file on the console, I'm unable to
 kill the tail process using the interrupt character after the test has
 4. By bisection, I found that the hpcmips tests started hanging on b5
 at the time of the commit
   2017. christos src/sys/kern/kern_lwp.c 1.191
 Since this caused the tests to hang earlier in the test run, in the
 lib/libc/sys/t_ptrace_wait3:resume1 test rather than in the network
 related tests where it is now hanging, it was not immediately clear
 whether that commit also triggered the present issue.  However...
 5. If I revert that commit, the tests do run to completion on b5.
 Andreas Gustafsson,

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