Date: Sun, 11 Oct 2015 15:37:18 +0200 From: Michael Ranner <michael@ranner.eu> To: Steven Hartland <killing@multiplay.co.uk>, freebsd-fs@freebsd.org Subject: Re: Zfs locking up process Message-ID: <561A660E.1020905@ranner.eu> In-Reply-To: <561A5445.40603@multiplay.co.uk> References: <CAFoaQoDdKHzASfgxY7ptHuqk=nCsxvpq4q3gr9_QsUK4Hkim9w@mail.gmail.com> <CAFoaQoCB5CmorF4wfabz7iBaqxzxxggdqJiqePUTqLCnFichWA@mail.gmail.com> <CAFoaQoAt--8pGh_vGVTfVWjEBJ5uRM0Tr6TS-czFbQ-eSHKvXg@mail.gmail.com> <CAFoaQoDVt5eJKTjcmGmR2fmQoL_WQV1ZebNUb_K9qLY4=cOi6A@mail.gmail.com> <561A2A4B.4080704@ranner.eu> <561A5445.40603@multiplay.co.uk>
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Am 11.10.15 um 14:21 schrieb Steven Hartland: > > > On 11/10/2015 10:22, Michael Ranner wrote: >> Am 07.10.15 um 17:11 schrieb Rajil Saraswat: >>> Hello >>> >>> I have server running Freenas 9.3 with a few jails. The machine has >>> two new >>> disks setup in mirror. I have a dataset (/mnt/tank/media) which is >>> shared >>> in two jails. >>> >>> Unfortunately, sometimes when I do a ls in a jail in the shared >>> directory I >>> see that the process just hangs. >>> >>> Today in the jail I did an 'su' and process just hung. On the host >>> if i do >>> ls /mnt/tank/media it also hangs. >>> >>> The su process (pid 77477) is taking up 100% cpu in the jail. It >>> seems that >>> zfs is holding up the process. Any idea what could be wrong? >>> >>> >> It is a known problem with ZFS and nullfs. I had no problems under >> FreeBSD 8 witch such a setup, but since FreeBSD 9 it is very unstable to >> mount_nullfs on ZFS. I experienced the same behaviour with Apache jails >> and PHP, mostly PHP running with 100% CPU inside the jail. > I'd have to disagree with this we have hundreds of machines on 10.1 > which uses nullfs every day and we've never seen a lockup. > > Given that do you have more information about this e.g. PR? There are some posts to freebsd-fs in 2014 like this: https://lists.freebsd.org/pipermail/freebsd-fs/2014-November/020482.html And an in depth insight von Andriy Gapon: https://lists.freebsd.org/pipermail/freebsd-fs/2014-September/020072.html The problem will become more frequently with heavy snapshot usage on the underlying ZFS datasets. Regards Michael
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