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Old 02-03-2010, 04:21 AM   #1
thelastboyscout
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Registered: Jul 2005
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Cool IRQ / interrupt conflict issues with megaraid and Linux - SOLVED


Ever since Linux kernels beyond 2.6.24.3, I've been unable to boot my HP Netserver LH3.

It gives a kernel panic with a variety of messages that always include "common_interrupt+0x38/0x39"

I tried everything from updating the BIOS and firmware, to myriads of differing kernel configurations (at 4 hours per compile, imagine the agony).

I also tried booting with every combination of the kernel boot parameters acpi=off, noapic, nolapic, irqpoll, etc that I could imagine. No dice.

In final desperation, I began unplugging PCI cards one by one before finally disconnecting the SDLT drive from the Netraid SCSI. Et voila!

It seems that in later kernels or versions of udev, sharing the SCSI bus with the LH3 drives causes conflicts.

I have an additional AHA SCSI card in the machine, so will try connecting the SDLT to that and see how it goes.
 
Old 02-03-2010, 08:29 AM   #2
SethsdadtheLinuxer
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if you're "seeing how it goes", is it really solved?
 
Old 02-03-2010, 08:43 AM   #3
thelastboyscout
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I've solved the boot problem which was the major issue. I had to upgrade from 2.6.23.3 to use the new udev.

That mission is accomplished.

Believe me, isolating this is a big deal - it has taken about the last week non-stop and whatever time was spent on the kernel upgrade attempts before that.

Further, there are a number of posts over the past 5 years asking if the megaraid driver works for the LH3 at all - due to the inability to isolate the cause of the interrupt conflict.

Now I'm seeing if I can connect the SDLT. I'll get back to you on that...
 
  


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bios, conflict, firmware, interrupt, irq, linux, megaraid, pci, scsi


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