[Bug 101891] mvsas prep failed, NULL pointer dereference in mvs_slot_task_free+0x5/0x1f0 [mvsas]

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https://bugzilla.kernel.org/show_bug.cgi?id=101891

--- Comment #7 from Dāvis <davispuh@gmail.com> ---
(In reply to Turbo Fredriksson from comment #6)
> Forgive an ignoramus, but those last lines doesn't look to good
> 
>     kernel: ata11.00: device reported invalid CHS sector 0
> 
> I have a problem that is very much like yours, but my stack traces are
> different so I'm unsure if we have the same problem. I'm going to rebuild my
> kernel as well with your fix and see if it helps me as well.

My fix is only for "NULL pointer dereference in mvs_slot_task_free" in mvsas
driver. If you use hardware with different driver then this fix won't change
anything for you. And even if you've such hardware and use this driver then you
might have hit different bug, you really should have posted stack trace, logs,
etc...

As for those other messages, I've no clue what they actually mean. But as I
understand under heavy I/O load pci_pool_alloc fails, so those tasks are
aborted and that probably prevents kernel from accessing disks and disk reset
is issued. Then it can access all disks again and everything keeps working.

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