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

2008/1/24, Yar Tikhiy <yar_at_comp.chem.msu.su>:
> 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
>
> The first lines of the ktr output are attached.  I can try to extract
> all 32768 lines if needed, but they all look almost the same.  I.e.,
> the function name and the td pointer are the same while td_locks
> bump is 1 or -1.

You mean the traced owner is always the same?
Do you see any call to lockmgr_disown() in the code?

Thanks,
Attilio


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