megasas: MFI FW status 0x3
jmalicki at metacarta.com
Wed Apr 25 12:44:26 CDT 2007
In 2.6.18 the default disk scheduler changed from Anticipatory to CFQ.
CFQ is a much better scheduler in that it allows more throughput and
load to go to the controller... unfortunately, this puts more stress on
a buggy controller, and thus crashes.
This is very interesting to me... firmware 5.0.3-00(10/01?) has been very
stable for us... has 5.1.1-0040 regressed?
>> the 2.6.16 kernel next. All indications are that it will panic and
>> clear any of the other kernel updates/patches of causing the issue.
>> If so, one of the [many] changes between 2006/02/28 and 2006/07/03 is
>> suspect for introducing this bug.
> I was wrong; the following is my updated test table:
> megasas-commit megasas dm-crypt works
> 2.6.15-gentoo-r5 2005-11-10 02.00-rc4 1.1.0 yes
> 2.6.16-hardened-r11 2006-02-28 02.04 1.1.0 yes
> 2.6.16-hardened-r11 2006-07-02 03.01 1.1.0 yes, with RESETs
> 188.8.131.52 2006-07-02 03.01 1.1.0 no
> 184.108.40.206 2006-07-03 03.01 1.1.0 no
> 2.6.18-hardened-r6 2006-07-03 03.01 1.1.0 no
> 2.6.20-hardened-r2 current/hand 03.05/03.09 1.3.0 no
> It seems to indicate that, instead of the version of the driver, the
> bug is dependent on the version of the kernel. All of the panic
> traces I have indicate consistent failure in megasas_isr, and are
> either "Unable to handle kernel paging request" or "Unable to handle
> kernel NULL pointer dereference". To my untrained eye, this looks
> like a race condition - megasas_isr (Interrupt Service Routine) is
> trying to service an interrupt that has already been handled by
> another thread. I can do singleton writes to the disk (small edits to
> files), but once the load increases and there are multiple, parallel
> interrupts and several items on the queue, the issue immediately
> appears. It's likely exacerbated by my use of dm-crypt and XFS as
> I know this may be beyond the level of this list, but it's worth a try...
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