** Summary changed:

- webbrowser-app crashed with SIGSEGV
+ webbrowser-app crashed with SIGSEGV in nv50_screen_fence_update()

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https://bugs.launchpad.net/bugs/1503213

Title:
  webbrowser-app crashed with SIGSEGV in nv50_screen_fence_update()

Status in webbrowser-app package in Ubuntu:
  Confirmed

Bug description:
  webbrowser-app crashed with SIGSEGV

  webbrowser-app 
  
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/1.3/Sections.qml:96: 
TypeError: Cannot read property 'length' of undefined
  qml: Loaded 3 UA override(s) from 
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-desktop.js
  nouveau: kernel rejected pushbuf: No such file or directory
  nouveau: ch0: krec 0 pushes 1 bufs 4 relocs 0
  nouveau: ch0: buf 00000000 00000002 00000004 00000004 00000000
  nouveau: ch0: buf 00000001 00000006 00000004 00000000 00000004
  nouveau: ch0: buf 00000002 00000038 00000004 00000004 00000000
  nouveau: ch0: buf 00000003 00000032 00000002 00000000 00000002
  nouveau: ch0: psh 00000000 0000048170 00000481e4
  nouveau:      0x0004a200
  nouveau:      0x00000001
  nouveau:      0x0004a314
  nouveau:      0x00000400
  nouveau:      0x0018a21c
  nouveau:      0x00000000
  nouveau:      0x00000040
  nouveau:      0x00000400
  nouveau:      0x00000100
  nouveau:      0x00000001
  nouveau:      0x00000000
  nouveau:      0x0008a238
  nouveau:      0x00000000
  nouveau:      0x00000000
  nouveau:      0x0008a30c
  nouveau:      0x207f3000
  nouveau:      0x20685000
  nouveau:      0x0004a234
  nouveau:      0x00000000
  nouveau:      0x0010a31c
  nouveau:      0x00000400
  nouveau:      0x00000100
  nouveau:      0x00000101
  nouveau:      0x00000000
  nouveau:      0x00107b00
  nouveau:      0x00000000
  nouveau:      0x20217000
  nouveau:      0x0000005d
  nouveau:      0x1000f010
  Segmentation fault (core dumped)

  ProblemType: Crash
  DistroRelease: Ubuntu 15.10
  Package: webbrowser-app 0.23+15.10.20150929-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
  Uname: Linux 4.2.0-14-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: Unity
  Date: Tue Oct  6 13:02:27 2015
  ExecutablePath: /usr/bin/webbrowser-app
  InstallationDate: Installed on 2015-09-18 (17 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150918)
  ProcCmdline: webbrowser-app
  SegvAnalysis:
   Segfault happened at: 0x7f6aa5fd6687:        mov    (%rax),%eax
   PC (0x7f6aa5fd6687) ok
   source "(%rax)" (0x7f6ab000a000) not located in a known VMA region (needed 
readable region)!
   destination "%eax" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: webbrowser-app
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
   ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
  Title: webbrowser-app crashed with SIGSEGV
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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