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** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/bugs/1454724/+attachment/4396864/+files/Stacktrace.txt

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https://bugs.launchpad.net/bugs/1454724

Title:
  mir_proving_server crashed with SIGSEGV in
  __pthread_mutex_unlock_usercnt()

Status in mir package in Ubuntu:
  New

Bug description:
  Am able to crash mir_proving_server (0.12.1 in archive) with the
  following:

  1. sudo mir_proving_server&
  2. sudo chmod 777 /tmp/mir_socket
  3. export MIR_SOCKET=/tmp/mir_socket QT_QPA_PLATFORM="ubuntumirclient"
  4. download http://pastebin.ubuntu.com/11112825/ and save as test.qml
  5. qmlscene test.qml
  6. resize the client window quite a bit - i.e. make it 500x400 or similar
  7. Ctrl+C the client

  Bug:
  mir_proving_server crashes

  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: mir-demos 0.12.1+15.04.20150324-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  Date: Wed May 13 14:44:50 2015
  ExecutablePath: /usr/bin/mir_proving_server
  ExecutableTimestamp: 1427214539
  InstallationDate: Installed on 2014-11-11 (183 days ago)
  InstallationMedia: Ubuntu-Desktop-Next 15.04 "Vivid Vervet" - Alpha amd64 (20141103)
  ProcCmdline: mir_proving_server
  ProcCwd: /home/gerry
  SegvAnalysis: Skipped: missing required field "Disassembly"
  Signal: 11
  SourcePackage: mir
  StacktraceTop:
   __pthread_mutex_unlock_usercnt (decr=1, mutex=0x1) at pthread_mutex_unlock.c:314
   __GI___pthread_mutex_unlock (mutex=0x1) at pthread_mutex_unlock.c:315
   __gthread_mutex_unlock (__mutex=<optimized out>) at /usr/include/x86_64-linux-gnu/c++/4.9/bits/gthr-default.h:778
   unlock (this=<optimized out>) at /usr/include/c++/4.9/mutex:153
   unlock (this=0x7f665649a700) at /usr/include/c++/4.9/mutex:530
  SystemImageInfo:
   current build number: 0
   device name: 
   channel: daily
   last update: Unknown
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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