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  gnome-shell crashed with SIGSEGV in ___vsnprintf_chk()

Status in libxau package in Ubuntu:
  Fix Released
Status in libxau source package in Bionic:
  In Progress
Status in libxau source package in Eoan:
  Fix Released
Status in libxau source package in Focal:
  Fix Released

Bug description:

  gnome-shell crashes a lot. Over 38000 times in bionic so far:

  [Test Case]

  None known yet. Just keeping an eye on the above link for regressions.

  [Regression Potential]

  Low. The same fix has been released to newer distros for the past 2
  years already.

  [Other Info]

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: gnome-shell 3.18.4-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-14.30-generic 4.4.5
  Uname: Linux 4.4.0-13-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: GNOME
  Date: Wed Mar 16 17:15:11 2016
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell

  InstallationDate: Installed on 2016-03-13 (6 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 
  ProcCmdline: gnome-shell --mode=gdm --wayland --display-server
   PATH=(custom, no user)
   Segfault happened at: 0x7f1ff33f46ab <___vsnprintf_chk+107>: movb   
   PC (0x7f1ff33f46ab) ok
   source "$0x0" ok
   destination "(%r12)" (0x00000000) not located in a known VMA region (needed 
writable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: gnome-shell
   ___vsnprintf_chk (s=0x0, maxlen=<optimized out>, flags=1, slen=<optimized 
out>, format=0x7f1fe54ccae5 "%s%s", args=args@entry=0x7f1fce502da8) at 
   ___snprintf_chk (s=<optimized out>, maxlen=<optimized out>, flags=<optimized 
out>, slen=<optimized out>, format=<optimized out>) at snprintf_chk.c:34
   XauFileName () from /usr/lib/x86_64-linux-gnu/libXau.so.6
   XauGetBestAuthByAddr () from /usr/lib/x86_64-linux-gnu/libXau.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
  Title: gnome-shell crashed with SIGSEGV in ___vsnprintf_chk()
  UpgradeStatus: No upgrade log present (probably fresh install)

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