[mythtv-users] OT: Backend Crashes with Machine Check Exception

Todd Pearsall mythtv at pearsall.us
Mon Nov 21 12:45:57 EST 2005

----- Original Message ----- 
From: "Jesse Guardiani" <jesse at wingnet.net>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Monday, November 21, 2005 12:24 PM
Subject: Re: [mythtv-users] OT: Backend Crashes with Machine Check Exception

> Todd Pearsall wrote:
>> Every 24 to 48 hours I get a hard crash on my Myth Backend:
>>  kernel: CPU 0: Machine Check Exception: 0000000000000004
>> kernel: Bank 4: b200000000070f0f
>> Kernel panic: CPU context corrupt
>>  My reseach pointed to a likely hardware issue, so one at a time I tried 
>> the following:
>> - swap RAM with a known "good" chip
>> - swap RAM with a different known "good" chip
>> - ran memtets86 for a week (no failures)
>> - moved around the PCI cards
>> - swapped video cards
>> - tried different PVR500 cards
>> - swapped CPUs
>> - kernal updates to 2.6.12
>>  After each change the system still crashed with the exact same error. 
>> More research pointed to a potential issue with the nVideo chipset and 
>> DMA.  I then set the system to boot with no DMA and it is rock solid. 
>> The only problem is that 3 or 4 PVR500 recordings and a stream or two 
>> leave the system in a 50% cpu wait state due to the slow disk.
>>  I'm having a hard time believing there is a DMA issue with the nVideo 
>> chipset and there is virtually no discussion of it, so I assume it's 
>> something hardware related to the disk.
>>  Next I'm planning to pull the CDROM and swap the IDE cables.  Does 
>> anyone have other ideas I should try?  I've been holding off on:
>> - a power supply swap since I don't have a big enough spare and would 
>> hate to spend the money for a "test".
>> - drive swap since it will be a pain
>> - motherboard swap since it will be an expensive test
>>  BTW, it is an ABIT NF8 motherboard that I am otherwise very happyy with.
> My money is on the mobo. I went through 3 of them before I found one that 
> was compatible with my PVR 350.
> I would get 12-24 hour lock-ups just like you.
> -- 
> Jesse Guardiani
> Programmer/Sys Admin
> jesse at wingnet.net

Was that 3 different motherboards or 3 of ABIT motherboards?


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