[Bug 844286] Re: colord crashed with SIGSEGV in dbus_message_get_reply_serial()

[Chris Halse Rogers]

OOOOOOH!

This could be a threading bug; colord uses g_dbus from glib, which is
threadsafe by means of proxying everything to the main thread, but also
links to libsane, which links to libavahi, which uses libdbus directly.
What's more, avahi spawns a bunch of threads.

libdbus isn't threadsafe unless dbus_threads_init() is called, and
nothing in this stack calls it.

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Title:
  colord crashed with SIGSEGV in dbus_message_get_reply_serial()

Status in “avahi” package in Ubuntu:
  Confirmed
Status in “avahi” source package in Quantal:
  Confirmed

Bug description:
  crashes at startup

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: colord 0.1.11-1ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
  Uname: Linux 3.0.0-10-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Wed Sep  7 14:06:00 2011
  ExecutablePath: /usr/lib/x86_64-linux-gnu/colord/colord
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110829.2)
  ProcCmdline: /usr/lib/x86_64-linux-gnu/colord/colord
  ProcEnviron:
   
  SegvAnalysis:
   Segfault happened at: 0x7f15e33888a5:	mov    (%r12,%rdx,1),%edx
   PC (0x7f15e33888a5) ok
   source "(%r12,%rdx,1)" (0x0000017a) not located in a known VMA region (needed readable region)!
   destination "%edx" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: colord
  StacktraceTop:
   ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
   ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
   dbus_message_get_reply_serial () from /lib/x86_64-linux-gnu/libdbus-1.so.3
   ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
   ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
  Title: colord crashed with SIGSEGV in dbus_message_get_reply_serial()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: scanner

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