On Wed, Nov 10, 2010 at 11:01:15AM +0100, Daniel Veillard wrote: > With some instruction on how to attach useful gdb backtraces > > Daniel > > 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 @@ > </ul> > > <p> > + 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 > +(gdb) > +</pre> You don't need to specify the /usr/sbin/libvirtd binary name on the command line to GDB if you're about to use 'attach', because GDB will find it automatically from the PID, but ACK anyway Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list