Re: panic: System call lstat returning with 1 locks held

On Thu, Jan 24, 2008 at 02:18:56PM +0100, Attilio Rao wrote:
> 2008/1/24, Yar Tikhiy <yar_at_freebsd.org>:
> > On Tue, Jan 15, 2008 at 04:39:24PM +0200, Kostik Belousov wrote:
> > >
> > > I think this could be related to the recent vn_lock()/VOP_LOCK() KPI changes.
> > > Please, add DEBUG_VFS_LOCKS to the kernel config, and do the
> > >       show lockedvnods
> > > from the ddb prompt when the panic occurs. The witness does not track
> > > the lockmgr locks.
> >
> > I think I'm seeing the same panic on UFS.  It's rather nasty: I
> > cannot rebuild CURRENT natively due to it so I have to build it
> > under 6-STABLE.  My favourite way to trigger the panic reliably is
> > running `make install' in a simple port directory, e.g., portmaster,
> > but my system also panics during daily scripts run and, as already
> > said, if trying to build world.
> 
> Yar,
> as it seems reproducible for you, can you please add this patch to the tree:
> http://www.freebsd.org/~attilio/debug_tdlocks.diff
> 
> compile your kernel with:
> options KTR
> options KTR_COMPILE=(KTR_SPARE2)
> options KTR_MASK=(KTR_SPARE2)
> options KTR_ENTRIES=32768
> 
> and once kernel panics, at ddb prompts do:
> > show ktr

Thank you for your instant response!

The patched kernel is already being built, but I've got the following
question in the meanwhile: Should I have updated my kernel to get your
latest changes to kern_lock.c?  Now my local copy of kern_lock.c is at
rev. 1.119, i.e., 1 revision behind today's change.

-- 
Yar