[Ubuntu Wiki] Update of "DebuggingProgramCrash" by penalvch

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Sun Dec 14 10:37:45 UTC 2014


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The "DebuggingProgramCrash" page has been changed by penalvch:
http://wiki.ubuntu.com/DebuggingProgramCrash?action=diff&rev1=119&rev2=120

Comment:
RM'ed erroneous / as running command verbatim caused it not to work.

  
  If there is no -dbg package:
  
-  1. Create an `/etc/apt/sources.list.d/ddebs.list` by running the following line at a terminal:
+  1. Create an `/etc/apt/sources.list.d/ddebs.list` by running the following line at a terminal: {{{
-  {{{
- echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe multiverse" | \
+ echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list }}}
- sudo tee -a /etc/apt/sources.list.d/ddebs.list
- }}}
-  1. Stable releases (not alphas and betas) require two more lines adding to the same file, which is done by the following terminal command:
+  1. Stable releases (not alphas and betas) require two more lines adding to the same file, which is done by the following terminal command: {{{
-  {{{
  echo "deb http://ddebs.ubuntu.com $(lsb_release -cs)-updates main restricted universe multiverse
- deb http://ddebs.ubuntu.com $(lsb_release -cs)-proposed main restricted universe multiverse" | \
+ deb http://ddebs.ubuntu.com $(lsb_release -cs)-proposed main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list }}}
- sudo tee -a /etc/apt/sources.list.d/ddebs.list
- }}}
  
   You may also add these lines using the Synaptic Package Manager:
    * Choose ''Synaptic'' via the ''System > Administration'' menu.
    * Choose ''Software Sources'' or ''Repositories'' via the ''Settings'' menu, and click on the ''Third-Party Software'' tab.
    * Click the ''Add'' button and enter each ''deb ...'' line as above one by one and click the ''Add Source'' button (you will have to add these lines one at a time).
  
-  1. Import the debug symbol archive signing key:
+  1. Import the debug symbol archive signing key: {{{
-  {{{
- sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 428D7C01
+ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 428D7C01 }}}
- }}}
  
-  1. Then run
+  1. Then run: {{{
-  {{{
- sudo apt-get update
+ sudo apt-get update }}}
- }}}
   to update your package list or click the ''Reload'' button if you used the Synaptic Package Manager.
  
-  1. The debug symbol packages have the '-dbgsym' suffix attached, so to install the debug symbols for the package 'yelp', you first run:
+  1. The debug symbol packages have the '-dbgsym' suffix attached, so to install the debug symbols for the package 'yelp', you first run: {{{
-  {{{
- apt-cache policy yelp
+ apt-cache policy yelp }}}
- }}}
   This will show you the version number currently installed (we'll use 2.22.1-0ubuntu2.8.04.1 in this example).
   '''NOTE:''' 'yelp' [which is the package name of "Help and Support" located under the 'System' menu] is ''just an example'' and '''not''' a part of the command: 'yelp' is only used to demonstrate the procedure. You must replace 'yelp' with the name of the package you want to debug.
  
-  1. Install the debug symbols:
+  1. Install the debug symbols: {{{
-  {{{
- sudo apt-get install yelp-dbgsym=2.22.1-0ubuntu2.8.04.1
+ sudo apt-get install yelp-dbgsym=2.22.1-0ubuntu2.8.04.1 }}}
- }}}
  You can also use the Synaptic Package Manager to search for 'yelp-dbgsym' and install it from there.
  
  The above procedure will install the debug symbol package for yelp only. Chances are that yelp uses shared libraries in other packages and debug symbols for them might be required in order to obtain a readable stack trace or perform other debugging tasks. 
  
- You can download the following [[attachment:list-symbols-packages-v2.1.sh |shell script (list-symbols-packages-v2.1.sh)]] to resolve all the dependencies. Attaching a debugger to an already running process may require elevated privileges even if you own the process. The following invocation will print out the list of files to install.
+ You can download the following [[attachment:list-symbols-packages-v2.1.sh |shell script (list-symbols-packages-v2.1.sh)]] to resolve all the dependencies. Attaching a debugger to an already running process may require elevated privileges even if you own the process. The following invocation will print out the list of files to install. {{{
-  {{{#!highlight bash
  sudo bash ./list-symbols-packages-v2.sh -p $(pidof yelp)}}}
  
- To automatically install them apt can be called with the input from the script. The script is invoked with {{{-t}}} for a terse output without the descriptions of the packages and error messages are suppressed.
+ To automatically install them apt can be called with the input from the script. The script is invoked with {{{-t}}} for a terse output without the descriptions of the packages and error messages are suppressed {{{
- 
-  {{{#!highlight bash
- sudo bash ./list-symbols-packages-v2.sh -t -p $(pidof yelp) 2>/dev/null|\
+ sudo bash ./list-symbols-packages-v2.sh -t -p $(pidof yelp) 2>/dev/null | xargs -d $'\n' sudo apt-get install }}}
- xargs -d $'\n' sudo apt-get install }}}
  
  /!\ Version 2 of this script makes it compatible with the newer GDB (which no longer loads all libraries at startup by default). -v2 currently only works if you run it against a currently-executing binary (i.e., with '-p $(pidof <whatever>'). The [[attachment:list-symbols-packages.sh|older version]] of the script is also available.
  
@@ -104, +86 @@

  
  === How do we remove all this stuff after getting the trace and get back to a normal system? ===
  
- You can remove all debug symbol packages and the ddebs repositories with the following commands:
+ You can remove all debug symbol packages and the ddebs repositories with the following commands: {{{
- 
-  {{{
  sudo apt-get remove \.*-dbgsym
  sudo rm /etc/apt/sources.list.d/ddebs.list
- sudo apt-get update
+ sudo apt-get update }}}
- }}}
- 
  
  === References ===
  
   * Announcement: https://lists.ubuntu.com/archives/ubuntu-devel-announce/2006-September/000195.html
  
  == The Xorg server ==
+ 
- The X server will by default trap its own crashes and dump a stack trace in /var/log/Xorg.0.log. However, this stack trace is modified by the signal handler itself. To get a "normal" crash, which will trigger a core dump (and ''apport'' reporting), add this to your /etc/X11/xorg.conf:
+ The X server will by default trap its own crashes and dump a stack trace in /var/log/Xorg.0.log. However, this stack trace is modified by the signal handler itself. To get a "normal" crash, which will trigger a core dump (and ''apport'' reporting), add this to your /etc/X11/xorg.conf: {{{
- {{{
  Section "ServerFlags"
          Option "NoTrapSignals" "true"
- EndSection
+ EndSection }}}
- }}}
  Please see [[X/Debugging]] for how to debug Xorg server crashes.
  
  == Info for the BugSquad ==



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