[Webkit-unassigned] [Bug 229758] New: [GTK] The Xvfb display server may fail to start sometimes causing tests to randomly crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229758

            Bug ID: 229758
           Summary: [GTK] The Xvfb display server may fail to start
                    sometimes causing tests to randomly crash
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org

I have observed this here: https://build.webkit.org/#/builders/199/builds/1062
 - If you take a look at that build there are 11 unexpected crashes which only happened on that build (didn't happened not on the build before or after)
 - There are no crash log for any of the crashes, this is weird.. it is an evidence it was not an actual crash but a failure to start
 - And if you take a closer look to the stdio log you see the crashes happened on a few workers. As soon as this workers were started all the tests on that workers crashed with a common stderr message: "Gtk-WARNING **: 15:52:29.549: cannot open display: :$X". And as soon the driver was restarted the tests started to work back again.

So, I think that what happened here was that the Xvfb driver failed to start on this workers, leading to crashes on all tests until it was restarted.

We need to make the Xvfb driver more robust and deal better with an eventual failure to start Xvfb.

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