Fatal trap 12: page fault while in kernel mode

Jeff,

I say that every year but it just never seems to happen.

BigWil
 
For those that were having these Kernel Panic Trap 12 errors on FreeBSD 6.1-6.2 could you please post the result of the following:

sysctl -a | grep nmbclusters

Better yet can those NOT having them on 6.1-6.2 and running Exim please post theirs as well.

I think I may have found a connection and can possibly defend Exim's innocence.

Thanks,

Big Wil
 
Thanks. What I am noticing is that each of the kernel builds were build with nmbclusters set to 8192 an old setting from previous finetuning with lower memory back in the 4.10 days. The two machines that had it set to 0 don't seem to have the problem. One with a very higher value about two times yours doesn't have the problem.

I have set two of the 8192 machines to 0 in loader.conf. We should know in a few days whether this has fixed the issue. I was informed that setting nmbclusters to 0 is a workaround for a bug that seems to exist in 6.1 on and probably won't be completely fixed until FBSD 7.

#### References
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2006-06/msg00011.html
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2006-06/msg00621.html
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2006-06/msg00636.html


Lets hope the workaround does the trick because I am not anxious for 7 yet.

BigWil
 
patrik said:
You're happy if your 6.2 servers runs for a week? Heck, sounds like you're having some serious issues. We run several 6.x servers and we aren't experiencing much problems at all actually. The panic I talked about in this thread is the first panic we've got and that has been solved by now.
Click to expand...

Hey Patrik what was your nmbclusters value?

Oh and by the way, if it was solved would you mind telling us what you did to solve it?

Big Wil
 
Last edited:
Hi,
I the new guy managing the servers Patrik used to manage.
This evening we had a similar Kernel Trap 12. da-popb4smtp is running on the server and I will let it run for a couple of days to see if the server crash again.

the nmbcluster-value is 25600.
 
Well Hi newguy. What OS release are you running on that thing? We upgraded all of our kernels that were having the issue. Kernel version 6.2-RELEASE-p8 or greater will fix that bug. They finally found it after telling us for almost two years that we had bad memory in our machines. Graciously they did retract the statement with a jolly "Sorry".

Upgrade to 6.2-RELEASE-p8 and I think you will be more than pleased.

BigWil
 
Hi,

Im running 6.2 and a compiled kernel from july 2007 so i guess its not p8.
I had not have any more crashes yet. We are going for 6.3 now so i guess it wont be any p8 but thanks anyway.
 
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