Re: Ultrasparc III+ kernel panic

On Mon, 23 Feb 2015, BERTRAND Joël wrote:

> > I'd turn on ddb and traptrace in the kernel and
> > examine the contents of the traptrace buffer after the panic.  That should
> > tell us the sequence of traps that caused the panic.
> 
> 	I'm trying, but it is not very easy. I have several Blade2000 and this
> bug seems to be triggered by something on PCI/UPA bus. At home, I have
> installed the same configuration (without external U320 disks, but with mpt
> adapter) and this server seems to be stable. I'm working on cpufreq and I
> haven't seen panic or deadlock for a long time.
> 
> 	Faulty servers are far away and I don't have any serial console, only
> SSH access.

In that case you could try turning on traptrace and wiring db_traptrace() 
to dump the buffer into the panic path.  Maybe also reduce the size of the 
traptrace buffer to hold only a couple of dozen entries so you don't 
overflow the syslog buffer.

Eduardo