[libvirt] [PATCH] Augment bug reporting documentation

Daniel Veillard veillard at redhat.com
Wed Nov 10 10:01:15 UTC 2010

With some instruction on how to attach useful gdb backtraces


diff --git a/docs/bugs.html.in b/docs/bugs.html.in
index 201705b..560dfa4 100644
--- a/docs/bugs.html.in
+++ b/docs/bugs.html.in
@@ -78,6 +78,35 @@
+      If the bug leads to a tool linked to libvirt crash, then the best
+      is to provide a backtrace along with the scenario used to get the
+      crash, the simplest is to run the program under gdb, reproduce the
+      steps leading to the crash and then issue a gdb "bt" command to
+      get the stack trace, attach it to the bug. Note that for the
+      data to be really useful libvirt debug informations must be present
+      for example by installing libvirt debuginfo package on Fedora or
+      Red Hat Enterprise Linux (with debuginfo-install libvirt) prior
+      to running gdb.</p>
+    <p>
+      It may also happen that the libvirt daemon itself crashes or get stuck,
+      in the first case run it (as root) under gdb, and reproduce the sequence
+      leading to the crash, similary to a normal program provide the
+      "bt" backtrace information to where gdb will have stopped.<br/>
+      But if libvirtd get stuck, for example seems to stop processing
+      commands, try to attach to the faulty daemon and issue a gdb command
+      "thread apply all bt" to show all the threads backtraces, as in:</p>
+      <pre> #  ps -o etime,pid `pgrep libvirt`
+... note the process id from the output
+# gdb /usr/sbin/libvirtd
+.... some informations about gdb and loading debug data
+(gdb) attach $the_damon_process_id
+(gdb) thread apply all bt
+.... informations to attach to the bug
+    <p>
       If requesting a new feature attach any available patch to the ticket
       and also email the patch to the libvirt mailing list for discussion
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel at veillard.com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/

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