Date: Thu, 15 Mar 2007 15:34:57 -0500 From: Guy Helmer <ghelmer@palisadesys.com> To: freebsd-questions@freebsd.org Subject: 6.2-amd64 Hang at reboot on Supermicro X7DBR-i+ Message-ID: <45F9ADF1.7060609@palisadesys.com>
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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 -- Guy Helmer, Ph.D. Chief System Architect Palisade Systems, Inc.
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