Re: How to get a crash dump with recursive panic?

[Darren Reed <darrenr%netbsd.org@localhost>]

On 10/06/2014 1:45 AM, Eduardo Horvath wrote:
> On Mon, 9 Jun 2014, Darren Reed wrote:
> 
>> In testing out ipfilter on sparc64, I see a bunch of "Alignment error"
>> messages like these:
>>
>> Alignment error: pid=24522.1 comm=ipfstat dsfsr=00000000:00800001
>> dsfar=ffffffff:fea0c252 isfsr=00000000:00808000 pc=10e3b0
>> Alignment error: pid=22537.1 comm=ipfstat dsfsr=00000000:00800001
>> dsfar=ffffffff:fea02252 isfsr=00000000:00808000 pc=10e3b0
>> Alignment error: pid=6845.1 comm=ipfstat dsfsr=00000000:00800001
>> dsfar=ffffffff:fea02252 isfsr=00000000:00808000 pc=10e3b0
>>
...
> 
> Trap type 0x34 is an alignment trap.  The instruction in question is 
> trying to load an 8-byte integer pointed to by %g4+0x20 into %g4.  You can 
> enable DDB and dump the registers to find the contents of %g4.  That 
> should not be 8-byte aligned.

Is there an easy way to drop into ddb when this error happens?
A sysctl that I can set?

Darren