panic: sbflush_locked on 5.4-p5/i386

[Robert Watson]

On Fri, 29 Jul 2005, Robert Watson wrote:

> On Fri, 29 Jul 2005, Alexander S. Usov wrote:
>
>>>> I got a few similar panics.
>>>> It looks that I managet to get rid of them by setting mpsafenet=0, but I
>>>> am not sure -- I have to monitor it for a bit longer.
>>>> I have managed to get a few dumps, so the traces are:
>> 
>> Unfortunately I don't have these dumps anymore, I will try to switch 
>> mpsafenet back on and wait for a new ones. They were quite reproducable for 
>> me.
>
> Thanks.  I will be away this weekend, but hope to have a chance to look 
> into this early next week.  If you could send me the dmesg of the box 
> also, and the output of "sysctl -a", that would be helpful.  Probably 
> out of band rather than via the list (or if you could put it on a web 
> page I could reach).

Two quetions:

- Is there substantial IPv6 traffic on this system?  I've had at least one
   report that this panic happens on a system only in the context of IPv6.

- Is it possible for you to try running with a latest 5-STABLE kernel?

Mohan at Yahoo!, who did the TCP SACK work, has been investigating the 
problem but has been unable to reproduce it either.  Fortunately, it 
sounds like Geore Neville-Neil is able to reprodeuce it in a test 
environment, albeit only with IPv6, so we'll see what we can do.  Mohan 
may shortly have a diagnostic patch to run with.

Thanks,

Robert N M Watson