unity8 crashed with SIGSEGV in _IO_vfprintf_internal()

[Edwin Pujols]

I ran unity8 using the following commands:

    $ export UBUNTU_ICON_THEME=ubuntu-mobile
    $ unity8 -mousetouch

After a while of "touching" around, I got to Recent Applications. There I had an instance of the Photo Gallery app, I wanted to close it so I held the mouse button over it. At that moment unity8 froze and in the terminal I could see something like:

    /usr/share/unity8/Dash/DashContent.qml <error>

this line (or similar) repeated many times before the segfault (the segfault wasn't immediate).

I must add that I launched Clementine player from the lock screen (using the sound indicator) before this exercise started.

Description: Ubuntu Saucy Salamander (development branch)
Release: 13.10

unity8:
  Installed: 7.81.3+13.10.20130905.2-0ubuntu1
  Candidate: 7.81.3+13.10.20130905.2-0ubuntu1
  Version table:
 *** 7.81.3+13.10.20130905.2-0ubuntu1 0
        500 http://do.archive.ubuntu.com/ubuntu/ saucy/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: unity8 7.81.3+13.10.20130905.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-5.10-generic 3.11.0
Uname: Linux 3.11.0-5-generic i686
ApportVersion: 2.12.1-0ubuntu3
Architecture: i386
Date: Thu Sep 5 20:20:43 2013
ExecutablePath: /usr/bin/unity8
InstallationDate: Installed on 2013-08-31 (5 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130830)
MarkForUpload: True
ProcCmdline: unity8 -mousetouch
SegvAnalysis:
 Segfault happened at: 0xb67278e0 <_IO_vfprintf_internal+32>: mov %eax,-0x484(%ebp)
 PC (0xb67278e0) ok
 source "%eax" ok
 destination "-0x484(%ebp)" (0xbf08af54) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity8
StacktraceTop:
 _IO_vfprintf_internal (s=0xbf08b418, format=0xb6c3f6f9 "%s", ap=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:270
 buffered_vfprintf (s=s@entry=0xb6892980 <_IO_2_1_stderr_>, format=format@entry=0xb6c3f6f9 "%s", args=args@entry=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:2341
 _IO_vfprintf_internal (s=s@entry=0xb6892980 <_IO_2_1_stderr_>, format=format@entry=0xb6c3f6f9 "%s", ap=ap@entry=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:1307
 ___fprintf_chk (fp=0xb6892980 <_IO_2_1_stderr_>, flag=1, format=0xb6c3f6f9 "%s") at fprintf_chk.c:36
 ?? () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
Title: unity8 crashed with SIGSEGV in _IO_vfprintf_internal()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 _IO_vfprintf_internal (s=0xbf08b418, format=0xb6c3f6f9 "%s", ap=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:270
 buffered_vfprintf (s=s@entry=0xb6892980 <_IO_2_1_stderr_>, format=format@entry=0xb6c3f6f9 "%s", args=args@entry=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:2341
 _IO_vfprintf_internal (s=s@entry=0xb6892980 <_IO_2_1_stderr_>, format=format@entry=0xb6c3f6f9 "%s", ap=ap@entry=0xbf08da9c "\240p\210\t\210,\272\t\370\332\b\277\001") at vfprintf.c:1307
 ___fprintf_chk (fp=0xb6892980 <_IO_2_1_stderr_>, flag=1, format=0xb6c3f6f9 "%s") at fprintf_chk.c:36
 fprintf (__fmt=0xb6c3f6f9 "%s", __stream=<optimized out>) at /usr/include/i386-linux-gnu/bits/stdio2.h:98

[Michał Sawicz (saviq)]

Wow the trace looks bad. Something looped in Qt, let's see if we get this again.

[Launchpad Janitor (janitor)]

[Expired for unity8 (Ubuntu) because there has been no activity for 60 days.]