kernel panic after 5.2 RELEASE --> 5.2.1, DELL PE2650, SCSI

[Scott Long]

Lachlan O'Dea wrote:
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> On 18 Feb 2004, at 10:41, Scott Long wrote:
> 
>> Jason M. Leonard wrote:
>>
>>> Without seeing the actual SCSI errors it is hard to say, but I was
>>> experiencing a very similar issue with my PE2650.  Disabling write 
>>> caching
>>> on the RAID 1 container cleared it up.  I do not know if that is the 
>>> best
>>> way to go about it, but this server had to be in production pronto, so I
>>> was happy.
>>> :Fuzz
>>
>>
>> If there is any way that you could send me the errors that you were
>> getting, I would appreciate it.
> 
> 
> Hi Scott,
> 
> This may be completely unrelated, but I just went from 5.2-RELEASE to 
> 5.2.1-RC2. After a while started seeing lots of these on the console:
> 
> aac0: command 0xXXXXXX timeout after 8597 seconds

As was mentioned, changing /sys/dev/aac/aacvar.h:AAC_MAX_FIBS from 512 
to 504 will work around this problem.  I'll commit this to RELENG_5_2 in
a minute.

> 
> and, less often:
> 
> swap_pager: indefinite wait buffer: device: aacd0s1e , blkno: 2, size: 4096

This is a result of the timeout error.

> 
> I managed to observe the system in top the second time this happened. 
> One after another, each process freezes forever in getblk. Kind of scary 
> to watch :-).
> 
> With 5.2-RELEASE, I was seeing the blocked processes, but I don't recall 
> seeing all of that console output before. I haven't actually seen 
> experienced any problems with 5.2-RELEASE for a while, I just have to 
> avoid long-running find(1) processes. (E.g. put 
> daily_status_security_enable="NO" in periodic.conf).

The same problem exists in 5.2.  I thought that I had fixed it, but
apparently not.

Scott

> 
> - --
> Lachlan O'Dea
> Computer Associates
> Senior Software Engineer
> tel: +61 3 8416 5627
> fax: +61 3 8416 5810
> mobile: +61 412 390 650
> odela01 at ca.com
> 
> Relax and enjoy your shoes!
> 
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