Panic when removing a SCSI device entry

Kostik Belousov kostikbel at
Sun May 8 20:45:18 UTC 2011

On Sun, May 08, 2011 at 10:36:34PM +0200, Joerg Wunsch wrote:
> As Kostik Belousov wrote:
> > > I could perhaps setup a serial console, so to get at least DDB
> > > functioning if you'd like to see more details.  ...
> > Serial console is fine, I do want to see a backtrace.
> > There is also "show cdev" command in ddb, that might provide some
> > useful information.
> OK, I'm setting up a DDB kernel right now, and attached an old laptop
> as the console terminal.  I also applied your suggested patch.

> > INVARIANTS may be also useful, since the kernel might catch the
> > corruption earlier.
> As INVARIANTS has a performance impact, I'd like to avoid that by now.
> Let's see first whether an analysis is possible without that.  If not,
> would it suffice to just compile kern_conf.c with INVARIANTS?

No, it is not enough to compile only kern_conf.c with INVARIANTS.
Performance impact is not that huge, and definitely pays it cost
for such problems.
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