Created attachment 818562 [details]
build.log

Description of problem:

virt-df and virt-alignment-scan tools normally run with
multiple threads, up to 12.  These tools are tested by
the libguestfs test suite, ie. 'make check'.

When running the libguestfs test suite, there is a deadlock
happening which causes these tests to fail.  It mostly happens
when the tests run in Koji.

See the attached build log for a typical example.

Version-Release number of selected component (if applicable):

libguestfs 1.24 & 1.25

How reproducible:

Quite often but not 100%

Steps to Reproduce:
1. Run 'make check -C df' and/or 'make check -C align'