Re: looking for help interpreting softlockup/stack trace

[David Daney <ddaney@avtrex.com>]

Ralf Baechle wrote:
> On Tue, Aug 05, 2008 at 12:25:02PM -0600, Chris Friesen wrote:
>
> > I've run into an interesting issue with an Octeon-based board, where it  
> > just seems to hang.  I suspect we're hitting some kind of locking bug,  
> > and I'm trying to track it down.  If it matters, the kernel is quite old  
> > (heavily patched 2.6.14) and I've got no chance of upgrading it.  (The  
> > usual embedded scenario.)
> > I've added some scheduler instrumentation, as well as adding a stack  
> > dump to the output of the softlockup code.
> > In the trace below, is "epc" the program counter at the time of the  
> > timer interrupt?  How does "ra" fit into this, given that the function  
> > whose address it contains isn't seen in the stack trace until quite a  
> > ways down?
> $LBB378 is an internal symbol.  The value of RA may not be very informative
> if it was overwritten by a random subroutine call.
I have thought about eliminating these internal labels when the module's 
symbols are read.  Would this make any sense?

David Daney