Date: Thu, 24 Jan 2008 17:58:11 +0300 From: Yar Tikhiy <yar@comp.chem.msu.su> To: Attilio Rao <attilio@freebsd.org> Cc: Kostik Belousov <kostikbel@gmail.com>, freebsd-current@freebsd.org Subject: Re: panic: System call lstat returning with 1 locks held Message-ID: <20080124145811.GB78114@comp.chem.msu.su> In-Reply-To: <3bbf2fe10801240518i6e18b2f5w84de652d4170c95b@mail.gmail.com> References: <790a9fff0801150552l542a4238ofc12efe5fdb45fc2@mail.gmail.com> <20080115143924.GB57756@deviant.kiev.zoral.com.ua> <20080124122808.GA15600@freefall.freebsd.org> <3bbf2fe10801240518i6e18b2f5w84de652d4170c95b@mail.gmail.com>
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On Thu, Jan 24, 2008 at 02:18:56PM +0100, Attilio Rao wrote: > 2008/1/24, Yar Tikhiy <yar@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
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