** Description changed:
- This happened after the upgrade from precise to quantal and a reboot.
- Once unity loaded, this error happened.
+ [Impact]
+ Unity Greeter can crash when X clients create X windows. This results in
Ubuntu going to failsafe mode.
- ProblemType: Crash
- DistroRelease: Ubuntu 12.10
- Package: unity-greeter 12.10.2-0ubuntu4
- ProcVersionSignature: Ubuntu 3.5.0-14.15-generic 3.5.3
- Uname: Linux 3.5.0-14-generic x86_64
- ApportVersion: 2.5.1-0ubuntu7
- Architecture: amd64
- Date: Sun Sep 9 03:46:17 2012
- ExecutablePath: /usr/sbin/unity-greeter
- InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
- ProcCmdline: /usr/sbin/unity-greeter
- ProcEnviron:
- PATH=(custom, no user)
- LANG=en_US.UTF-8
- SHELL=/bin/false
- SegvAnalysis:
- Segfault happened at: 0x7fbd0a2ceb80 <gdk_window_get_type_hint>: mov
0x18(%rdi),%rax
- PC (0x7fbd0a2ceb80) ok
- source "0x18(%rdi)" (0x00000018) not located in a known VMA region (needed
readable region)!
- destination "%rax" ok
- SegvReason: reading NULL VMA
- Signal: 11
- SourcePackage: unity-greeter
- StacktraceTop:
- gdk_window_get_type_hint () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
- ?? ()
- ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
- ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
- gdk_display_get_event () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
- Title: unity-greeter crashed with SIGSEGV in gdk_window_get_type_hint()
- UpgradeStatus: Upgraded to quantal on 2012-09-08 (0 days ago)
- UserGroups:
+ When an X window appears Unity Greeter receives a Map event. Unity
+ Greeter attempts to get a GdkWindow object for the window in the event.
+ If the window was destroyed before it does this it gets a NULL pointer.
+ Unity Greeter did not check for this case.
+
+ [Test Case]
+ This is a bug that only occurs if windows rapidly appear and disappear. Can
be verified on machines that are exhibiting the problem (perhaps linked to
indicators failing to start). Check errors.ubuntu.com shows problem does not
occur when fix applied.
+
+ [Regression Potential]
+ Low, the change just checks for the NULL pointer and ignores the map event.
** Changed in: unity-greeter (Ubuntu)
Assignee: (unassigned) => Robert Ancell (robert-ancell)
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https://bugs.launchpad.net/bugs/1048131
Title:
unity-greeter crashed with SIGSEGV in gdk_window_get_type_hint()
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