[Cc:-ed FUJITA Tomonori who did the Alpha IOMMU changes - full report
from Bob quoted below.]
Bob, does latest -git boot if you revert these 4 commits:
commit d5a4630a0daad241c761064295958554472ed491
Author: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Tue Mar 4 14:28:58 2008 -0800
alpha: remove unused DEBUG_FORCEDAC define in IOMMU
commit cf5401454863df8e6dc3ebe8faad09141cbec187
Author: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Tue Mar 4 14:28:57 2008 -0800
alpha: make IOMMU respect the segment boundary limits
commit 23d7e0390ab57cf15a5cfe8d6806192f0997e5a8
Author: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Tue Mar 4 14:28:57 2008 -0800
alpha: IOMMU had better access to the free space bitmap at only one place
commit 3c5f1def7dd50b792f56dcf7378c2684c06947f3
Author: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Tue Mar 4 14:28:54 2008 -0800
alpha: convert IOMMU to use ALIGN()
Ingo
* Bob Tracy <rct@xxxxxxxx> wrote:
> The regression is relative to 2.6.25-rc1 + timer fixes (added when
> I reported the problems with 2.6.25-rc1 relative to 2.6.24). I haven't
> tried -rc2 or -rc3.
>
> Might be related to similar reports I've seen, but wanted to add the
> Alpha platform to the list. The -rc4 kernel boots, but at some point
> following initialization of the SCSI layer, there's a panic with enough
> diagnostic output that a 50-line screen can't hold it all. Unfortunately,
> the system logging isn't active, so nothing gets captured.
>
> The panic is completely reproducible. The "Code" line at the bottom
> of the panic output is
>
> 44220001 4821f621 4821b681 4821f62b f420004f 00000081 <0000009b> 0066c012
>
> The first line of the "Trace" section is
>
> [<fffffc000031a41f>] iommu_arena_alloc+0x64/0xe0
>
> Platform is an Alpha PWS 433au. gcc is version 4.1.2 (Debian 4.1.1-21).
>
> --
> ------------------------------------------------------------------------
> Bob Tracy | "I was a beta tester for dirt. They never did
> rct@xxxxxxxx | get all the bugs out." - Steve McGrew on /.
> ------------------------------------------------------------------------
> --
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