Hi,


Andrew Doran wrote:
> On Fri, Nov 30, 2007 at 09:22:39AM +0200, Brad du Plessis wrote:
>
>   
>> On this system a few of days ago (Intel DG33FB, Intel 2180, 4.0_RC3 
>> GENERIC.MP) I encountered random segmentation faults when trying to 
>> build pkgsrc packages.
>>     
> ..
>   
>> You'll note that what is a bit concerning is that no system running with 
>> both cores enabled passed this test. Has anyone else by any chance tried 
>> this on a Core 2 Duo system and seen similar results?
>>
>> Is this something to worry about, or is this a bogus test?
>>     
>
> As Matthias mentioned it is likely to be a TLB management bug in the CPU,
> possibly not one that can be patched by the BIOS.
>
> Do your tests fork a lot? Can you try adding a "tlbflushg();" to the end
> of pmap_destroy() in src/sys/arch/x86/x86/pmap.c and see if that helps?
>   


The test does no forking that I'm aware of. I did however run 2 
instances of the application to occupy both CPU cores. I tried this 
pmap.c change and the test ran for about 30 minutes before failing. Is 
there anything else I can check/try?

Thanks,
 Brad