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[Matthias Klose <doko@xxxxxxxxxx>]

** Changed in: gdb (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/728216

Title:
  GDB fails to get a valid backtrace while debugging a Webkit SIGSEGV

Status in Linaro GDB:
  Invalid
Status in “gdb” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: gdb

  Ubuntu libwebkitgtk-1.0-0 1.3.12-0ubuntu2 package crashes while
  initializing Webkit with a SIGSEGV (bug 728211) on ARM.

  While starting the Webkit-only Browser example
  (/usr/lib/webkitgtk-1.0-0/libexec/GtkLauncher) with GDB, it fails to
  get a proper BT, even after installing the proper debug symbols.

  ubuntu@panda-natty:~$ gdb /usr/lib/webkitgtk-1.0-0/libexec/GtkLauncher
  GNU gdb (GDB) 7.2-ubuntu
  Copyright (C) 2010 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "arm-linux-gnueabi".
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>...
  Reading symbols from /usr/lib/webkitgtk-1.0-0/libexec/GtkLauncher...Reading symbols from /usr/lib/debug/usr/lib/webkitgtk-1.0-0/libexec/GtkLauncher...done.
  done.
  (gdb) set follow-fork-mode child
  (gdb) r
  Starting program: /usr/lib/webkitgtk-1.0-0/libexec/GtkLauncher 
  [Thread debugging using libthread_db enabled]
  [New Thread 0x438022a0 (LWP 2513)]
  [New Thread 0x441022a0 (LWP 2514)]
  [New Thread 0x4779d2a0 (LWP 2515)]
  [Thread 0x4779d2a0 (LWP 2515) exited]

  Program received signal SIGSEGV, Segmentation fault.
  0x441e2a0e in ?? ()
  (gdb) bt
  #0  0x441e2a0e in ?? ()
  #1  0x47feb702 in ?? ()
  Backtrace stopped: previous frame identical to this frame (corrupt stack?)

  I also failed to get a backtrace when using current Linaro GDB
  (7.2-2011.02-1-bzr) from lp:gdb-linaro

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: gdb 7.2-1ubuntu8
  ProcVersionSignature: Ubuntu 2.6.35-1102.5release1-omap4 2.6.35.3
  Uname: Linux 2.6.35-1102-omap4 armv7l
  Architecture: armel
  Date: Thu Mar  3 01:24:47 2011
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gdb
  UpgradeStatus: No upgrade log present (probably fresh install)

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