[Bug 1248968] perl-Test-NeedsDisplay-1.07-11.fc24 FTBFS randomly

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1248968



--- Comment #2 from Petr Pisar <ppisar at redhat.com> ---
First failure in Koschei
<https://apps.fedoraproject.org/koschei/package/perl-Test-NeedsDisplay/727095>
is:

        systemd-libs     223-2.git65c85ef....     >     224-1.fc24
    libuuid     2.26.2-3.fc24     >     2.27-0.1.fc24
    systemd     223-2.git65c85ef....     >     224-1.fc24
    libmount     2.26.2-3.fc24     >     2.27-0.1.fc24
    libfdisk     2.26.2-3.fc24     >     2.27-0.1.fc24
    python3-dnf     1.0.2-2.fc24.1     >     1.0.2-3.fc24
    dnf-conf     1.0.2-2.fc24.1     >     1.0.2-3.fc24
    util-linux     2.26.2-3.fc24     >     2.27-0.1.fc24
    kernel-headers     4.2.0-0.rc4.git3.1....     >     4.2.0-0.rc4.git4.1....
    libblkid     2.26.2-3.fc24     >     2.27-0.1.fc24
    libsmartcols     2.26.2-3.fc24     >     2.27-0.1.fc24

But the cause can be earlier because it's a probabilistic failure. I though it
was caused by upgrading xorg-server, but it fails even with old xorg-server
1.17.2-2.

It's a race condition between stopping and starting Xvfb. In case of the
failure, one can see that Xvfb from t/10_run.t is still running, so second Xvfb
refuses to start and X client cannot open display (both Xvfb are terminated or
xauth does not match) and xvfb-run killing the second Xvfb fails because it
finishes before the killing.

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