Date: Tue, 9 Mar 2010 13:29:54 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Stefan Bethke <stb@lassitu.de> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Many processes stuck in zfs Message-ID: <20100309122954.GE3155@garage.freebsd.pl> In-Reply-To: <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de> References: <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de>
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--+jhVVhN62yS6hEJ8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 09, 2010 at 10:15:53AM +0100, Stefan Bethke wrote: > Over the past couple of months, I've more or less regularly observed mach= ines having more and more processes stuck in the zfs wchan. The processes = never recover from that, and trying to reboot only gets the entire system s= tuck, without any console messages. I can enter the debugger, and I have s= aved a couple of dumps. >=20 > The situation seems to be triggered by zfs receive'ing snapshots from the= sister machine (both synchronize their active ZFS filesystems to each othe= r, using zfs send and zfs receive). It appears it's the receiving causing = trouble. >=20 > Both machines run 8-stable from mid-February, with a single-disk ZFS pool= , with ARC limited to 512M, prefetch and ZIL disabled via loader.conf. >=20 > What should I be looking at to further diagnose? What kind of hardware do you have there? There is 3-way deadlock I've a fix for which would be hard to trigger on single or dual core machines. Feel free to try the fix: http://people.freebsd.org/~pjd/patches/zfs_3way_deadlock.patch --=20 Pawel Jakub Dawidek http://www.wheelsystems.com pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --+jhVVhN62yS6hEJ8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkuWP0EACgkQForvXbEpPzQCcQCfQqvddvCccbLw3EUv2m6jCi1u 1Y8An3FZEheJd24loScxPr/nrEy1kkM7 =wzoV -----END PGP SIGNATURE----- --+jhVVhN62yS6hEJ8--
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