Re: Linux Kernel 2.6.13-rc7 (WORKS) (2.6.13, DRQ/System CRASH)

[Justin Piszcz]

Also,

Part of the problem may be that I have two ATA/133 Promise cards in one 
box and only one ATA/133 in the other box.

Kernel 2.6.13 has fixed the problem with one ATA/133 card in the box.
Kernel 2.6.13 has not fixed the problem with two ATA/133 cards in the box.

FYI

Justin.


On Mon, 5 Sep 2005, Alan Cox wrote:

> On Llu, 2005-09-05 at 09:26 +0200, Bartlomiej Zolnierkiewicz wrote:
> > After DMA timeout driver reverted back to PIO,
> > ide-taskfile.c also holds PIO code besides IDE Taskfile Access.
>
>
> On SMP after a DMA timeout it will potentially freeze. There are some
> paths in that code which lead to double lock takes and hangs, plus some
> timer races.
>
> Justin can you make a backup (I mean that seriously), then build a
> kernel with spin lock debug enabled and see if you can reproduce the
> problem and get a trace.
>
> If its the locking you'll get a trace and the kernel will continue. At
> that point because the spinlock debug continues unsafely through a
> double lock after the trace you are in the "danger zone" hence the
> backup warning
>
> [Yes the spin lock debug code really should warn you its dangerous for
> non debug uses or get patched as it is in Fedora to trace and stop]
>
> If its a hardware or other problem it will still hang
>
> if its an unrelated lock problem it should still get a trace.
>
>
> Why you see this only on 2.6.13 not 2.6.13-rc7 I don't know. It makes me
> wonder if you have a bad drive - but then you imply going back to rc7
> goes back to stable. Can you therefore also check the .config options
> between the two kernels match.
>
> Alan
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