https://bugs.freedesktop.org/show_bug.cgi?id=76742
Priority: medium
Bug ID: 76742
Assignee: [email protected]
Summary: Startup failure: XDM authorization key matches an
existing client
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: x86 (IA32)
Status: UNCONFIRMED
Version: 4.2.2.1 release
Component: Libreoffice
Product: LibreOffice
LibreOffice-4.2.2 frequently but intermittently fails to start on Slackware
Linux with the following error:
XDM authorization key matches an existing client!
/opt/libreoffice4.2/program/soffice.bin X11 error: Can't open display:
The startup failure happens about 65% of the time; the other 35% of the time it
starts and runs correctly. The problem did not occur with LibreOffice-4.1.4 on
the same system.
This happens when using XDM as the login manager, and only when
XDM-AUTHORIZATION-1 authentication is enabled (as it is by default with xdm).
I can disable XDM-AUTHORIZATION-1 and enable only MIT-MAGIC-COOKIE-1 by placing
the following into /etc/X11/xdm/xdm-config:
DisplayManager*authName: MIT-MAGIC-COOKIE-1
Then the problem goes away, and LibreOffice-4.2.2 always starts correctly.
Possibly the same exact issue was reported with Firefox, about 10 years ago, as
documented here: https://bugzilla.mozilla.org/show_bug.cgi?id=246313
My understanding is that the problem is caused by a race condition between
child and parent processes opening a connection to the X server (hence the
intermittent nature), and/or the weakness in XDM-AUTHORIZATION-1 generation of
unique tokens.
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