[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
bugzilla-daemon at webkit.org
Wed Sep 1 04:33:53 PDT 2021
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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