Re: kgdb 2.3 hangs

Tom, Ming,

module debugging patch uses read memory packets, so it won't have any smp 
issues.

Have you passed "nmi_watchdog=1" to kernel through grub.conf file? Please also 
check the output of dmesg, to confirm that NMI watchdog in deed works. If it 
doesn't you'll see a message in dmesg output. If nmi_watchdog=1 doesn't work 
try nmi_watchdog=2. (Yeah, seems like a joke, but that's exactly what it 
is :-)

I see two different issues here.

1. You could go ahead after turning off console messages over kgdb. This 
should be required. I would like to see a dump of packets with this option 
turned on. We'll get some idea about why this option is causing a problem.

I have seen a bug report earlier where console message packets got mixed up 
with regular gdb packets, don't know how. Couldn't reproduce it later. I 
think we should print a message from kgdb indicating that smp isn't working. 
Perhaps halt kernel at that point.

2. The output you have sent is rather limited. Could you send the _whole_ 
output. That is right from the point where gdb prints it's initial version 
no. etc. to the point where debugging fails.

-Amit

On Friday 27 Jan 2006 9:12 pm, Ming Zhang wrote:
> On Fri, 2006-01-27 at 08:31 -0700, Tom Rini wrote:
> > On Fri, Jan 27, 2006 at 10:12:46AM -0500, Ming Zhang wrote:
> > > thanks for the hint.
> > >
> > > now i deselect the "console message over kgdb" and use this 'set debug
> > > remote 1', the boot process is good.
> > >
> > >
> > > now is another problem.
> > >
> > > it hangs when loading module.
> >
> > You need to have a custom compiled GDB with the patches found in CVS,
> > if you've also got the 'module.patch' patch applied.
>
> i run the gdb_mod 2.3 from download page. i assumed that is the one you
> mentioned.
>
> > But I'll admit I haven't tested module autoloading stuff on SMP, but it
> > should work.
>
> though i am using a dual opteron, i already disabled SMP and choose P4
> for a 32bit compilation.
>
> ming
>
>
>
>
>
>
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