Okay, I have done some new tests, in two totally different computers, one with 
Intel graphics card and the other with ATI/AMD graphics card.
With X server to becomes crazy I mean, all windows starting to flash and being 
totally unresponsive for instance.
An important discovery is that the bug only occurs when Quassel window is 
maximized and then you put it in full-screen. Then X server freezes screen 
image and becomes totally unresponsive to mouse or keyboard events (or in rare 
occasions, it becomes a little crazy). At this point, with Intel graphics 
computer, I can jump to a tty and restart kdm service to can use X server 
again. But in the ATI graphics computer, going to tty causes a total system 
hang, resulting in a dark but flashing screen, Alt + Impr + k does nothing, but 
Alt + Impr + b hardly reboots the system.
While X server was frozen, I have take a look at CPU and memory usage with top 
command, and I did not see any strange.

Can't you reproduce the bug? Can I give any other valuable debug
information or backtrace?

** Changed in: quassel (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/847484

Title:
  quassel crashed with SIGSEGV in _IO_vfprintf_internal()

Status in “quassel” package in Ubuntu:
  New
Status in “xorg-server” package in Ubuntu:
  New

Bug description:
  Quassel crashed and also made Xorg to crash when I switch to full
  screen mode.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: quassel 0.7.3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
  Uname: Linux 3.0.0-10-generic x86_64
  ApportVersion: 1.22.1-0ubuntu2
  Architecture: amd64
  Date: Mon Sep 12 02:31:35 2011
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/quassel
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
  ProcCmdline: /usr/bin/quassel
  SegvAnalysis:
   Segfault happened at: 0x7fdd526ec522 <_IO_vfprintf_internal+50>:     mov    
%eax,-0x518(%rbp)
   PC (0x7fdd526ec522) ok
   source "%eax" ok
   destination "-0x518(%rbp)" (0x7fffda001b28) not located in a known VMA 
region (needed writable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: quassel
  StacktraceTop:
   _IO_vfprintf_internal (s=0x7fffda002050, format=0x7fdd54215e0d 
"LANGUAGE=%s", ap=0x7fffda0021c8) at vfprintf.c:245
   ___vsnprintf_chk (s=0xe88750 "", maxlen=<optimized out>, flags=1, 
slen=<optimized out>, format=0x7fdd54215e0d "LANGUAGE=%s", args=0x7fffda0021c8) 
at vsnprintf_chk.c:65
   ___snprintf_chk (s=<optimized out>, maxlen=<optimized out>, flags=<optimized 
out>, slen=<optimized out>, format=<optimized out>) at snprintf_chk.c:36
   snprintf (__fmt=0x7fdd54215e0d "LANGUAGE=%s", __n=42, __s=<optimized out>) 
at /usr/include/x86_64-linux-gnu/bits/stdio2.h:66
   KCatalogPrivate::setupGettextEnv (this=0xe71e80) at 
../../kdecore/localization/kcatalog.cpp:183
  Title: quassel crashed with SIGSEGV in _IO_vfprintf_internal()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  XsessionErrors:
   (process:3445): libindicate-WARNING **: Unable to get property data: 
GDBus.Error:com.canonical.indicate.NO_SUCH_PROPERTY: Indicator 1 has no 
property named 'icon'
   (process:3445): libindicate-WARNING **: Unable to get property data: 
GDBus.Error:com.canonical.indicate.NO_SUCH_PROPERTY: Indicator 1 has no 
property named 'count'

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