I'm investigating a problem where a pretty much stock 6.2 SMP kernel randomly hangs on multiple Supermicro X7DBR-i+ and X7DBR-8+ systems. The system syncs the filesystems and prints "Uptime: ...", then hangs.

So far, I've narrowed it down to the MOD_SHUTDOWN request to the "rootbus" module. Adding a printf() before and after the "device_shutdown(child);" line in subr_bus.c method bus_generic_shutdown() seems to make the problem go away, as does running a kernel with INVARIANTS, WITNESS, and DDB/KDB. I'm trying to reproduce the hang on a plain SMP kernel with just DDB/KDB, but it hasn't hung yet.

Any ideas?


Guy Helmer, Ph.D.
Chief System Architect
Palisade Systems, Inc.

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