Followup: PROBLEM: Kernel bug at tg3.c:2456

Followup: PROBLEM: Kernel bug at tg3.c:2456

[Sergio Chiesa]

Sergio Chiesa wrote:

> 7.7.
> Well, it seems that with the original onboard raid controller the bug
> didn't trigger... the controller was swapped with the lsi logic by my
> supplier because it fails badly with raid-5 arrays (hw/fw related issue)
> I also tried the original broadcom driver version 7.3.5 with similar
> results...

I made some tests again, switching back to the onboard dual aic7902 scsi 
controller (non raid) the tg3 dont hung anymore.
I just noticed the IRQ mappings change between the two settings.
The Broadcom eth get always the IRQ #25, the two onboard scsi controllers 
get #24 and #25 (shared with the eth, is it harmful??) but the megaraid 
driver gets the IRQ #28

I think it is something IRQ related because if the eth hungs but the kernel 
is still running I see more than 140000 irq per second with "vmstat".

Hope it helps better!

Sergioc.

RE: Followup: PROBLEM: Kernel bug at tg3.c:2456

[Ju, Seokmann]

On Thursday, March 31, 2005 7:34 AM, Sergio wrote:
> I made some tests again, switching back to the onboard dual 
> aic7902 scsi 
> controller (non raid) the tg3 dont hung anymore.
> I just noticed the IRQ mappings change between the two settings.
> The Broadcom eth get always the IRQ #25, the two onboard scsi 
> controllers 
> get #24 and #25 (shared with the eth, is it harmful??) but 
> the megaraid 
> driver gets the IRQ #28
Can you please specify megaraid driver version?
It seems the megaraid driver gets unique IRQ and the IRQ dedicated to the
MegaRAID controller.
I don't see any problem concerning IRQ at this time. Difference of
performance in between MegaRAID and Adaptec can contribute the issue.

> Usually there
> are no messages on screen, but the last time I get "Kernel bug at
> tg3.c:2456"!! on the sender. The skb pointer in the tx_ring_info was
> null.... May it be queue overrun?
I would suggest to look into the issue from above perspective. 

Thank you.

Seokmann
LSI Logic Corporation.


> -----Original Message-----
> From: Sergio Chiesa [mailto:sergio.chiesa@eutelia.it] 
> Sent: Thursday, March 31, 2005 7:34 AM
> To: linux-kernel@vger.kernel.org
> Subject: Followup: PROBLEM: Kernel bug at tg3.c:2456
> 
> Sergio Chiesa wrote:
> 
> > 7.7.
> > Well, it seems that with the original onboard raid 
> controller the bug
> > didn't trigger... the controller was swapped with the lsi 
> logic by my
> > supplier because it fails badly with raid-5 arrays (hw/fw 
> related issue)
> > I also tried the original broadcom driver version 7.3.5 with similar
> > results...
> 
> I made some tests again, switching back to the onboard dual 
> aic7902 scsi 
> controller (non raid) the tg3 dont hung anymore.
> I just noticed the IRQ mappings change between the two settings.
> The Broadcom eth get always the IRQ #25, the two onboard scsi 
> controllers 
> get #24 and #25 (shared with the eth, is it harmful??) but 
> the megaraid 
> driver gets the IRQ #28
> 
> I think it is something IRQ related because if the eth hungs 
> but the kernel 
> is still running I see more than 140000 irq per second with "vmstat".
> 
> Hope it helps better!
> 
> Sergioc.
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Re: Followup: PROBLEM: Kernel bug at tg3.c:2456

[Sergio Chiesa]

Ju, Seokmann wrote:

> Can you please specify megaraid driver version?

the v2.4.29 bundled one, v2.10.3.
I'm going to try the last one from your site, the 2.10.9


>>Usually there
>>are no messages on screen, but the last time I get "Kernel bug at
>>tg3.c:2456"!! on the sender. The skb pointer in the tx_ring_info was
>>null.... May it be queue overrun?
> 
> I would suggest to look into the issue from above perspective. 

I found two very old posts (mid 2002) which recall very similar behaviou. I 
didn't find any fix to this two.

http://groups-beta.google.com/group/mlist.linux.kernel/browse_thread/thread/56c3c65c939f0baa/fd63101a0b32ea21?q=tg3&rnum=2#fd63101a0b32ea21
http://groups-beta.google.com/group/mlist.linux.kernel/browse_thread/thread/8b962774c3c5adef/ca778af36b802362?q=tg3&rnum=6#ca778af36b802362


TIA
Sergioc.