Re: Experiencing hangs on SMP box with no console messages given for clues. Details inside.

2007/3/10, Tillman Hodgson <tillman_at_seekingfire.com>:
> On Thu, Mar 08, 2007 at 03:40:41PM -0500, Kris Kennaway wrote:
> > On Thu, Mar 08, 2007 at 06:59:27AM -0600, Tillman Hodgson wrote:
> > > Howdy folks,
> > >
> > > These has been happening every few days for a few weeks now. When it
> > > occurs, there's no messages logged to the console or to syslog -- it
> > > just silently hangs. I added the break-to-debugger option so that I can
> > > at least reboot it remotely via the serial console.
> > >
> > > I've been following the -current kernel fairly closely in hopes that it
> > > was just due to a transitory -current problem. I don't mind rebuilding a
> > > kernel with special options if it's useful -- I'll be rebuilding this
> > > morning with WITNESS and INVARIANTS for sure.
> >
> > Let us know when you have the corresponding debugging.
>
> [root_at_athena /usr/src/sys/i386/conf]# diff ATHENA GENERIC
> 24c24
> < ident         ATHENA
> ---
> > ident         GENERIC
> 71,73d70
> <
> < ### Tillman added 26Feb07 as per http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/serialconsole-setup.html
> < options               BREAK_TO_DEBUGGER
>
> Ran a kernel from backdated src (Feb 22) on a suggestion from Paolo,
> hang occurred within 24 hours (eliminating that particular commit). I
> have the core saved to work with and I'm now rebuilding a March 10
> kernel.
>
> I'm trying to follow the instructions at
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#KERNEL-PANIC-TROUBLESHOOTING
> and in
> http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html?page=1
> but I'm running into an issue even getting gdb to start:
>
> [root_at_athena /var/crash]# which gdb
> /usr/bin/gdb
> [root_at_athena /var/crash]# gdb -k
> gdb: unrecognized option `-k'
> Use `gdb --help' for a complete list of options.
>
> The man page doesn't list a -k option either. /usr/src/UPDATING doesn't
> seem to mention any gdb changes.

man kgdb

Attilio


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