FreeBSD patch level downgrade - trying to solve FreeBSD kernel panic issue

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perkypork

Hi everyone!

I have 6 servers in production, 4 of which are running 10.2-p7 and two which are running 10.2-p8. The 4 running patch level 7 are operating fine but the ones running p8 are kernel panicking under high ZFS load.

Would someone be able to tell me how I would be able to downgrade or specify the patch level to install on the 2 servers that are crashing so that I can make sure its not a FreeBSD bug and continue on my box ticking?

All 6 servers are exactly the same in every respect. I have run hardware tests on the 2 crashing servers and they both come up with no errors. The only difference between the working servers and the crashing ones are the patch level. Not saying this is a FreeBSD issue, just trying to tick all the boxes to find the source of this crashing.
 
Thanks pkubaj, your reply has given me another thing to add to the list....

I am rsyncing lots of files to this box, which is then causing the kernel panic. I thought it might have been a ZFS issue but now I need to look at OpenSSL and rsync(1) first.
 
UPDATE:

Downgraded to 10.2-RELEASE and still get the same problem. We are going to try a couple of different ways to narrow down this issue.
 
It's the unionfs/jail bug. Thanks everyone for looking/helping!
 
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