[Bug 690239] Re: hang in g_spawn_sync and select()

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/compiz

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https://bugs.launchpad.net/bugs/690239

Title:
  hang in g_spawn_sync and select()

Status in Compiz Core:
  Fix Committed
Status in “glib2.0” package in Ubuntu:
  Triaged
Status in “glib2.0” source package in Natty:
  Won't Fix

Bug description:
  This happens particularly on session start with compiz launched by
  gnome-session.

  this happens with 1:0.9.2.1+glibmainloop3-0ubuntu1 which get the
  backend data at the very beginning of its initializaion (-0ubuntu2
  delay that a little bit and is working fine).

  A more complete backtrace in a different case seems to be related at
  https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=654027

  (gdb) attach 4088
  Attaching to process 4088
  […]
  0x0028d416 in __kernel_vsyscall ()
  (gdb) bt
  #0  0x0028d416 in __kernel_vsyscall ()
  #1  0x0040235d in select () from /lib/libc.so.6
  #2  0x0019a40b in g_spawn_sync (working_directory=0x0, argv=0x9b46530, envp=0x0, flags=G_SPAWN_SEARCH_PATH, child_setup=0, user_data=0x0, 
      standard_output=0xbfab84ac, standard_error=0xbfab84a8, exit_status=0xbfab84a4, error=0xbfab851c) at /build/buildd/glib2.0-2.27.4/glib/gspawn.c:321
  #3  0x0019a9ac in g_spawn_command_line_sync (
      command_line=0x9b46438 "dbus-launch --autolaunch=403b6ccfaa8567027cff37a700000008 --binary-syntax --close-stderr", standard_output=0xbfab84ac, 
      standard_error=0xbfab84a8, exit_status=0xbfab84a4, error=0xbfab851c) at /build/buildd/glib2.0-2.27.4/glib/gspawn.c:706
  #4  0x0100dfba in get_session_address_dbus_launch (error=0xbfab851c) at /build/buildd/glib2.0-2.27.4/gio/gdbusaddress.c:1039
  #5  0x0100fb41 in get_session_address_platform_specific (bus_type=G_BUS_TYPE_SESSION, cancellable=0x0, error=0xbfab8638)
      at /build/buildd/glib2.0-2.27.4/gio/gdbusaddress.c:1136
  #6  g_dbus_address_get_for_bus_sync (bus_type=G_BUS_TYPE_SESSION, cancellable=0x0, error=0xbfab8638) at /build/buildd/glib2.0-2.27.4/gio/gdbusaddress.c:1219
  #7  0x01019db9 in get_uninitialized_connection (bus_type=G_BUS_TYPE_SESSION, cancellable=0x0, error=0xbfab8638)
      at /build/buildd/glib2.0-2.27.4/gio/gdbusconnection.c:6209
  #8  0x01021d0d in g_bus_get_sync (bus_type=G_BUS_TYPE_SESSION, cancellable=0x0, error=0xbfab8638) at /build/buildd/glib2.0-2.27.4/gio/gdbusconnection.c:6268
  #9  0x004a50b7 in ?? () from /usr/lib/libgconf-2.so.4
  #10 0x004a5374 in gconf_activate_server () from /usr/lib/libgconf-2.so.4
  #11 0x004afb8c in ?? () from /usr/lib/libgconf-2.so.4
  #12 0x004b0571 in ?? () from /usr/lib/libgconf-2.so.4
  #13 0x004b07d6 in ?? () from /usr/lib/libgconf-2.so.4
  #14 0x004b1127 in gconf_engine_notify_add () from /usr/lib/libgconf-2.so.4
  #15 0x004b8902 in gconf_client_add_dir () from /usr/lib/libgconf-2.so.4
  #16 0x00823138 in ?? () from /usr/lib/compizconfig/backends/libgconf.so
  #17 0x0082514a in ?? () from /usr/lib/compizconfig/backends/libgconf.so
  #18 0x0030fb7c in ccsSetBackend () from /usr/lib/libcompizconfig.so.0
  #19 0x003117d0 in ?? () from /usr/lib/libcompizconfig.so.0
  #20 0x00311970 in ccsEmptyContextNew () from /usr/lib/libcompizconfig.so.0
  #21 0x00311a85 in ccsContextNew () from /usr/lib/libcompizconfig.so.0
  #22 0x002b0902 in CcpScreen::CcpScreen(CompScreen*) () from /usr/lib/compiz/libccp.so
  #23 0x002b14c4 in CompPlugin::VTableForScreen<CcpScreen>::initScreen(CompScreen*) () from /usr/lib/compiz/libccp.so
  #24 0x08093dcc in CompPlugin::screenInitPlugins(CompScreen*) ()
  #25 0x08074ebe in CompScreen::init(char const*) ()
  #26 0x08065d69 in CompManager::init() ()
  #27 0x08065fb5 in main ()
  (gdb) quit

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: libglib2.0-0 2.27.4-0ubuntu1
  ProcVersionSignature: Ubuntu 2.6.37-8.21-generic 2.6.37-rc4
  Uname: Linux 2.6.37-8-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Tue Dec 14 17:33:18 2010
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100918)
  ProcEnviron:
   PATH=(custom, user)
   LANG=fr_FR.utf8
   SHELL=/bin/bash
  SourcePackage: glib2.0

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