Re: [Repost] Ultra2 SMP freezes with heavy disk I/O

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On Tue, Mar 20, 2007 at 07:01:02PM +0100, mt1@xxxxxxxxxxx wrote:
> 	Hello,
> 
> 	I have posted this message yesterday but I don't see it on the mailing list.
> 	Sorry for the inconvenience if you see it twice...
> 
> 	Today, I have tested hardware with diag-switch? and diag-level true and
> 	a serial console. Nothing to declare...
> 
> 	Original message:
> 
>     Hello,
> 
>     A, U2 (2 GB, 2 UltraSPARC-II, 2 73 GB SCSI disks [raid1]) is running
> 	Debian/testing with 2.6.20.3 kernel. This station is used as mail server
> 	and I have seen some freezes. When it freezes, sysrq or stop+A do not
> 	work (not panic nor Oops, only freeze).
> 
>     I have tested 2.6.18 (from debian), 2.6.20.x without any success.
> 	When I boot with root=/dev/sda4 instead root=/dev/md1, system is
> 	more stable (but not enough to be a mail server :-( ).
> 
>     With 2.4 kernel and without raid1 (I don't understand  why I
> 	cannot use my raid1 volumes with 2.4 kernel...), system is
> 	stable and does not freeze. I have tested hardware with SUNvts
> 	(from Solaris 9) and it sounds good.
> 
>     With the _same_ kernel, an U60-SMP is stable. The difference
> 	between both kernel are only Sbus versus PCI support _and_
> 	ESP-SCSI version Symbios support. I suspect a bug in the
> 	ESP-SCSI support but I don't know how investigate. I cannot
> 	boot any 2.6.20 with debug option du to a "address not
> 	aligned" message when it boots.
> 
>     Any suggestion ?

	I have tried the last 2.6.21-rc4. Same bug.

	JKB
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