Automatic backtrace [Was: Re: NetAPP/Samba 3.0/plugs]

[Mats olsson]

just my 2 cents

If you are going to dump the trace into the standard logs, Should we ignore 
the max logsize parameter? if we don't, we might not get a complete dump at 
once. If we do we might could provide problems for someone who relies on 
this paramter.

/mats

>From: Andrew Bartlett <abartlet at pcug.org.au>
>To: Scott Gifford <sgifford at suspectclass.com>
>CC: Andrew Bartlett <abartlet at pcug.org.au>, David Lee 
><t.d.lee at durham.ac.uk>, samba-technical at lists.samba.org
>Subject: Re: Automatic backtrace [Was: Re: NetAPP/Samba 3.0/plugs]
>Date: Wed, 13 Mar 2002 20:57:43 +1100
>
>Scott Gifford wrote:
> >
> > Andrew Bartlett <abartlet at pcug.org.au> writes:
> >
> > > Scott Gifford wrote:
> > > >
> > > > Andrew Bartlett <abartlet at pcug.org.au> writes:
> > > >
> > > > > David Lee wrote:
> > > >
> > > > [...]
> > > >
> > > > > > 3. If "gdb" (or similar) is found and "--enable-debug" is set, 
>then the
> > > > > >    default panic action could be to invoke gdb (or other 
>debugger) with
> > > > > >    the relevant subcommands to perform and log the backtrace.
> > > > > >
> > > > > > Sure, that probably needs refinement.  But for the moment read 
>it for the
> > > > > > positive possibilities not the worrying nitpicks.
> > > > > >
> > > > > > Promising?  Or an unrealistic non-starter?
> > > > >
> > > > > Quite promising, and it would *really* help with our debugging.
> > > >
> > > > Perhaps I'm missing something obvious, but why not just let Samba 
>dump
> > > > core?...It's straightforward to provide a backtrace from a core 
>file.
> > >
> > > Where?  Under what uid?  Following what symlinks?
> >
> > All of this is handled by the OS, and core is dumped in the current
> > working directory.  I don't know how Samba decides what directories to
> > chdir() into, but if it wanders around a bit, something like
> > chdir("/some/known/directory"); abort(); in a signal handler will make
> > sure that the corefile ends up in a sane place.
>
>But as what user?  And it must work perfectly across 30 different
>operating systems.  A sig11 that has us compleatly hosed must not be
>able to affect where/how we dump core.
>
>In any case, the user who understands what a 'core' does is not the
>target audience.  The target audience is the user who gets a Panic and
>doesn't know much more than how to send us a logfile.
>
>If we can somehow safely redirect a backtrace into the standard samba
>logfile then that would be great!
>
>Andrew Bartlett
>
>--
>Andrew Bartlett                                 abartlet at pcug.org.au
>Manager, Authentication Subsystems, Samba Team  abartlet at samba.org
>Student Network Administrator, Hawker College   abartlet at hawkerc.net
>http://samba.org     http://build.samba.org     http://hawkerc.net
>


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