Re: Oops running oprofile in 2.5.62

Dave Hansen
2003-02-27T17:48:52Z

John Levon wrote:
> On Wed, Feb 26, 2003 at 10:29:43PM -0800, Dave Hansen wrote:
>
>>I'm pretty sure it happened on this line in oprofile_add_sample():
>> cpu_buf->buffer[cpu_buf->pos].eip = eip;
>>
>>Unable to handle kernel paging request at virtual address f8c3c000
>
> Odd. UP or SMP ? Were you shutting down oprofile at the time (or did the
> daemon crash ? check /var/lib/oprofile/oprofiled.log)

16-way NUMAQ :) It was in the middle of a dbench run, so nothing
critical was happening with oprofile.

> The only thing I can think is that the buffer got freed then we got an
> NMI afterwards (which obviously isn't supposed to happen...)

The irqbalance code is causing some funniness on these machines, so it
might be related. I'll speak up if I see it again.

--
Dave Hansen
haveblue@us.ibm.com