Repeated panics...Suspect USB issues

Doug White dwhite at
Fri Mar 11 18:51:22 PST 2005

On Fri, 11 Mar 2005, Josh Tolbert wrote:

> > A backtrace would be nice. See the developer's handbook on kernel
> > debugging for details.
> I'm trying to get a backtrace. I've built a kernel with all the right
> bits, set up dumpdir and dumpdev in /etc/rc.conf, etc...Apparently
> savecore doesn't like writing to the swap partition (/dev/ar0s1b). I can
> get to the ddb promp, obtain a trace, panic the machine, etc...But I
> don't think I can obtain a good core without putting another hard drive
> in the machine, which isn't going to happen till sometime next week...Is
> there anything I can provide from the ddb prompt?

savecore *reads* from the swap partition, not *writes* to it. It will drop
the recovered core in /var/crash unless you tell it otherwise.

The developer's handbook has a command list for ddb. "trace" is generally
what we want.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at          |

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