Date: Mon, 19 Mar 2007 12:56:55 -0500 From: Guy Helmer <ghelmer@palisadesys.com> To: freebsd-stable@freebsd.org Subject: Re: 6.2-amd64 Hang at reboot on Supermicro X7DBR-i+ Message-ID: <45FECEE7.6080107@palisadesys.com> In-Reply-To: <45FAA837.6060603@palisadesys.com> References: <45FAA837.6060603@palisadesys.com>
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Guy Helmer wrote: > (reposting since this involves 6-stable) > > 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. > I'm still not clear as to why, but the following change to bus_generic_shutdown() has kept the machines in question successfully rebooting continuously without hanging for the past three days: Index: sys/kern/subr_bus.c =================================================================== RCS file: /home/ncvs/src/sys/kern/subr_bus.c,v retrieving revision 1.184.2.4 diff -u -r1.184.2.4 subr_bus.c --- sys/kern/subr_bus.c 22 Sep 2006 18:49:14 -0000 1.184.2.4 +++ sys/kern/subr_bus.c 16 Mar 2007 17:59:04 -0000 @@ -2913,7 +2913,11 @@ device_t child; TAILQ_FOREACH(child, &dev->children, link) { + //printf(" Calling device_shutdown on child '%s':\n", child->nameunit); + DELAY(1000); device_shutdown(child); + //printf(" Returned from device_shutdown on child '%s'.\n", child->nameunit); + DELAY(1000); } return (0);
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