[mythtv-users] OT: Backend Crashes with Machine Check Exception
Jesse Guardiani
jesse at wingnet.net
Mon Nov 21 12:24:09 EST 2005
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
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