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[Bug 1204939] Re: Unity doesn't start on ATI test machine (Mir fails to respond to drm_auth_magic request)

To: xubuntu-dev@xxxxxxxxxxxxxxxxxxx
From: Chris Halse Rogers <chris@xxxxxxxxxxxxxx>
Date: Wed, 14 Aug 2013 00:56:06 -0000
Reply-to: Bug 1204939 <1204939@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Description changed:

+ Sometimes when running on the i386 ATI jenkins box, XMir hangs when
+ Compiz is started.
+
+ When it's hung, it's blocked in DRI2Authenticate, in mir_wait_for on the
+ results of mir_drm_auth_magic.
+
+ Applying http://paste.ubuntu.com/5983202/ to Mir to debug this, we get:
+
+ Client output - http://paste.ubuntu.com/5981035/
+ Server output - http://paste.ubuntu.com/5981019/
+
+ So it appears that the second drm_auth_magic request is written to the
+ socket but Mir never responds to it.
+
+ I have no idea why, though.
+
+ ==== Original report ====
+
The log files are deceptive - the error comes from the failsafe X
session which is started for some reason.

LightDM, unity-system-compositor, and XMir all come up fine and have no
unexpected log output.

gnome-session.log, however, has
"""
I/O error : Bad file descriptor
/usr/share/compiz/place.xml:1: parser error : Document is empty

^
/usr/share/compiz/place.xml:1: parser error : Start tag expected, '<' not found

^
I/O error : Bad file descriptor
compizconfig - Info: Backend : gsettings
compizconfig - Info: Integration : true
compizconfig - Info: Profile : unity
compiz (core) - Info: Loading plugin: composite
compiz (core) - Info: Starting plugin: composite
compiz (core) - Info: Loading plugin: opengl

(polkit-gnome-authentication-agent-1:10828): polkit-gnome-1-WARNING **: Unable to determine the session we are in: No session for pid 10828
compiz (core) - Info: Unity is fully supported by your hardware.
compiz (core) - Info: Unity is not supported by your hardware. Enabling software rendering instead (slow).
compiz (core) - Info: Starting plugin: opengl
"""

** Description changed:

Sometimes when running on the i386 ATI jenkins box, XMir hangs when
Compiz is started.

When it's hung, it's blocked in DRI2Authenticate, in mir_wait_for on the
results of mir_drm_auth_magic.

Applying http://paste.ubuntu.com/5983202/ to Mir to debug this, we get:

Client output - http://paste.ubuntu.com/5981035/
Server output - http://paste.ubuntu.com/5981019/

So it appears that the second drm_auth_magic request is written to the
socket but Mir never responds to it.

- I have no idea why, though.
+ I have no idea why, though. When I attached gdb to unity-system-
+ compositor in the hung case there didn't seem to be any deadlocked
+ thread or the like; everything seemed to be waiting on input.

==== Original report ====

The log files are deceptive - the error comes from the failsafe X
session which is started for some reason.

LightDM, unity-system-compositor, and XMir all come up fine and have no
unexpected log output.

gnome-session.log, however, has
"""
I/O error : Bad file descriptor
/usr/share/compiz/place.xml:1: parser error : Document is empty

^
/usr/share/compiz/place.xml:1: parser error : Start tag expected, '<' not found

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https://bugs.launchpad.net/bugs/1204939

Title:
Unity doesn't start on ATI test machine (Mir fails to respond to
drm_auth_magic request)

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