Panic in the udp_input() under heavy load

[Maxim Sobolev]

On 11/24/2011 11:24 PM, Robert N. M. Watson wrote:
>>> There was recently a commit to fix a race condition in 10-CURRENT which
>>> >>  I think is not slated to be merged for 9.0. You might check the commit
>>> >>  logs there and see if that fixes the problems you have -- if so, we
>>> >>  might want to reconsider the plan not to merge for 9.0.
>>> >>
>>> >>  (It relates to a race condition on closing sockets..)
>> >
>> >  Thank you for the tip. I will give it a try and see what happens. So far, after installing that trap we have not seen any panics yet. I have not checked logs yet if my trap actually has catch anything or not.
> Do we know if this fix has been merged to stable/9 and releng/9.0? Given multiple reports of instability without it, I think we would be well-served to merge it at this point.

Hey Robert, sorry to bother you again, but can you at least point me 
towards specific SVN revisions that I need to get merged? I tried to 
google it and also browsed my svn history for the last 4 months using 
keyword "sockets", but nothing came up. This fix is critical for any 
system that does lot of fault-ctitical networking, and FreeBSD has 
always been solid in this regard. It saved us at least 10-15 crashes 
across 5 machines in the last month.

Thanks!

-Maxim