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Date:      Wed, 10 Mar 2010 13:56:39 +0100
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Borja Marcos <borjam@sarenet.es>
Cc:        freebsd-fs@freebsd.org, FreeBSD Stable <freebsd-stable@freebsd.org>
Subject:   Re: Many processes stuck in zfs
Message-ID:  <20100310125639.GB1715@garage.freebsd.pl>
In-Reply-To: <E31E46B1-0FDC-4C6A-AD47-9B78D54790EC@sarenet.es>
References:  <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de> <20100309122954.GE3155@garage.freebsd.pl> <EC9BC6B4-8D0E-4FE3-852F-0E3A24569D33@sarenet.es> <20100309125815.GF3155@garage.freebsd.pl> <CB854F58-03AF-46DD-8153-85FA96037C21@sarenet.es> <BFF1E2D6-B48A-4A5E-ACEE-8577FDB07820@sarenet.es> <20100310110202.GA1715@garage.freebsd.pl> <E31E46B1-0FDC-4C6A-AD47-9B78D54790EC@sarenet.es>

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On Wed, Mar 10, 2010 at 01:32:02PM +0100, Borja Marcos wrote:
> Trying. I started my typical test:
>=20
> Machine 1 doing a make buildworld on a dataset with src and obj on it.
>=20
> Machine 1 replicating incremental snapshots of the dataset to machine 2.
>=20
> Machine 2 running some "tar cf - . | ( cd /pool/anotherdataset && tar xf =
- )" from the dataset being replicated, ie, doing read operations on the ta=
rget dataset.
>=20
> This time, with all those debug options, there was no deadlock, but almos=
t an instant trap entering DDB. Unfortunately, I tried to capture the outpu=
t of "alltrace", etc using the capture option. But couldn't come back to th=
e system to read it.
>=20
> Any ideas? I'm using VMWare Fusion to run FreeBSD for these tests and see=
ms I'm out of luck, I don't see any console output mechanism.

You should be able to use text dumps to capture output of those commands
on panic.

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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