[HPDD-discuss] kernel panic when upgrading from lustre-zfs 2.3.49 -> lustre-zfs 2.4

Hello, Last year around this time I set up a lustre / zfs system based on zfs 0.6.0_rc3_31chaos lustre 2.3.49.92 that I built from source. It's been chugging along merrily with a combined MGS/MDS and Three OSSs, each with one OST. For some other reasons I had to upgrade the other machines in my cluster from Redhat 6.3 to Redhat 6.4 and it seemed like a good time to try and update to a more official release. I followed the instructions on zfslinux.org for adding their repository and installed zfs 0.6.2 and lustre-2.4.0. After un-mounting all of the clients / OSTs and the MGS/MDS I restarted the system with the new lustre and zfs installed. The zfs filesystems looked OK, but when I tried to "mount -a -t lustre" it had a kernel panic. I haven't been able to get a dump off of the machine yet, but I was wondering if anyone else has run in to this type of problem when doing an upgrade with zfs osds. Also, any recommendations on trying to troubleshoot this while I leave the current system running would be appreciated. My plan is to send a zfs snapshot of the MGS/MDS to another machine and try upgrading it there. I'm wondering if I might need to do a "zpool update" before I try and mount the lustre filesystem. Thanks, -Nate Garver-Daniels Systems Administrator