Re: FreeBSD 5.1-R kernel panic

On Tue, Jul 22, 2003 at 12:18:31AM +0100, Bruce Cran wrote:
> On Mon, Jul 21, 2003 at 06:43:11PM +0000, Bosko Milekic wrote:
> > 
> > 
> > On Mon, Jul 21, 2003 at 06:24:07PM -0400, Mik Firestone wrote:
> > > For what it is worth, I am having the exact same problem.  I cvsup'd and
> > > builtworld on Sunday, July 20,  and my machine has been crashing about every
> > > half-hour since.  It starts slowing down, the load average begins to
> > > climb until it eventually grinds to a halt.  If I wait long enough, I
> > > will see the same panic Stephane saw.
> > > 
> > > Doing a ps -auxw shows that usb0 is using the vast majority of the CPU
> > > time before the grinding halt.  I have tried leaving the machine in
> > > multi-user and sigle-user mode with the same results.  I have attempted
> > > to compile a new kernel that does not have the USB stuff compiled in,
> > > but my machine won't stay running long enough.
> > > 
> > > I do have the debugger compiled in, but I do not know enough of what I
> > > am doing to provide reasonable information to the list.  If somebody
> > > can tell me the commands to run in the debugger, I will let my machine
> > > panic again and grab that data.
> > > 
> > > Mik
> > 
> >   Does reverting to pre-July 20 get rid of your problem?  Note that the
> >   originator of the first Email mentionned that he is running what
> >   appeared to be stock 5.1-RELEASE, which may or may not be related to
> >   what you're seeing.
> > 
> >   If reverting to pre-July 20 gets rid of your problem, perhaps we can
> >   figure out what commit triggered this behavior for you.  Also, do you
> >   have PAE enabled?
> > 
> 
> It sounds like the same or similar problem reported in the 'USB crappiness'
> thread - the system slows down, and then any command crashes the system with
> the error about kmem.  I posted a backtrace to the problem in usb_mem.c, and
> the developer has posted a temporary fix - it was a problem with bus_dma,
> it was allocating too much memory and running out of kernel memory.
> 
> If the kernel debugger is compiled in, the system should drop to the db> 
> prompt when it panics.  Type 'tr' and post the results it gives.  This
> panic appears to stop memory dumps working, otherwise you could set the
> dumpdev variable in rc.conf also get
> the source listing of where the problem occurs: the FreeBSD Developers Handbook
> has more information.
> 
> --
> Bruce Cran
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Thanks!  I found the thread in the archives and applied the patch.  My
machine is now up and seems to be much happier.

Mik