"test-lock" stuck on FreeBSD

[Assaf Gordon]

Hello,

On FreeBSD 10, 9.3, 8.4 (running inside kvm), the test "test-lock" sometime 
gets stuck.

It was found through libunistring but I've also reproduced it with the latest 
gnulib directly (v0.1-210-g4738e5a), by doing:

    ./gnulib/gnulib-tool --create-testdir --dir=test-thread --with-tests thread
    cd test-thread
    ./configure && make dist

Then running the tarball test package inside the FreeBSD virtual machines.

A comment by Daiki Ueno indicates this might already be known issue:
  http://lists.gnu.org/archive/html/bug-libunistring/2014-09/msg00005.html

This is failure is somewhat reproducible.
On some occasions the test executable is running at %100 CPU for a long time:
     PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
   24972 gordon       11  44    0 12616K  4372K urdlck  10:30 98.97% test-lock

In other cases it completes successfully after ~2 minutes.

Attached are logs from Valgrind/Helgrind tool.
On Ubuntu, it only complains about access to a global "volative int" variable, 
which I guess is intentional.
On FreeBSD, there are many more complains about other issues (not sure if 
false-positives or not).

Regards,
 - Assaf

Ubuntu.test-lock.helgrind.log.xz
Description: application/xz

FreeBSD10.test-lock.helgrind.log.xz
Description: application/xz