[parisc-linux] Re: Dodgy SCSI in L2000

[James Braid]

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> The fault was caused at 0x0000000010108fe0 - I need to see the
> matching vmlinux and System.map to determine where this is in
> the code.
> 

Ah, mind if send you the vmlinux and System.map off-list?


> When the box freezes, do "tc" from GSP. On reboot, at PDC prompt
> type "ser pim" to get the state of the machine when it was TC'd.
> Once you've saved the PIM dump, it's good to clear PIM.
> (iirc, "ser clearpim")
> Again, save matching Sysytem.map and vmlinux.
> 

> IIRC, setting _SYNC parameter to 10 is equivalent to "fast".

Okay, I will try that and put a new kernel in.
 
> oic. In cases like this, we have to disable Stack Dumping since
> it data page faults. I suspect that's what's happened in the
> previous dumps too. You can disable stack dumps by changing "#if 1"
> to "#if 0" on line 149 (show_stack()) in
> arch/parisc/kernel/traps.c.  

I will disable that as well and put a new kernel in.

> BTW, typically this msg means a kernel driver is attempting 
> to directly
> access user space data instead of copying the data into kernel
> space.  

That sounds nasty...

> > so I cranked it up to dbench 100. That crashed nicely with 
> this panic:
> > 
> > Dumping Stack from 0x0000000056390000 to 0x0000000056390000:
> > 
> > Kernel Fault: Code=15 regs=0000000046390000
> > (Addr=0000000056388018) 
> 
> did you get the "Stack pointer and cr30 do not correspond!" 
> msg before this?

Yep, I did get the "Stack pointer..." stuff before this, I left it
off the email though.

> Me either since I've not seen this problem. This does sound like
> the SCSI interface driver is hitting a corner case and dying there.
> But that's just a SWAG.
> 
> I'll have to get dbench and try it on the a500 when that's
> available.  

Cool.

Thanks, James.

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