I am managing 3 (Sun Ultra2, SunOS 5.6) AFS servers which have now been upgraded to afs3.5 3.52. We have roughly 300 clients, a mix of Solaris and SunOS 4.x machines. Most of the clients are still running afs3.4, but we have begun to upgrade some of the major machines to the same version as the servers. Before this upgrade we suddenly started to see many machines reboot in the mornings at roughly the same time with the above kernel trap. What is worrying is that this is still happening with machines that have been upgraded, even the AFS servers will crash with this error. I have tried searching the Transarc archives but at this stage haven't found anything relevant. Is this a known problem? Also the fact that the reboots happen at about the same time suggests some cron-related activity but I haven't been able to determine that yet. Noel Hunt