Date: Wed, 19 Feb 2014 12:22:15 -0800 From: Dennis Glatting <dg@pki2.com> To: dcamp@alumni.ufl.edu Cc: freebsd-questions@freebsd.org Subject: Re: System freezes up during long-running ZFS disk activity Message-ID: <1392841335.17181.46.camel@btw.pki2.com> In-Reply-To: <CADbaceJ00rk8RFMwi-S-HLNBX673j2DGe6SngUcvYTFTd5KFxw@mail.gmail.com> References: <CADbaceJ00rk8RFMwi-S-HLNBX673j2DGe6SngUcvYTFTd5KFxw@mail.gmail.com>
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Sorry, I forgot to mention this URL: https://wiki.freebsd.org/AvgZfsDeadlockDebug On Wed, 2014-02-19 at 15:06 -0500, Christian Campbell wrote: > I recently installed 9.2-RELEASE-p3 on a Dell Precision T5400. I'm using > ZFS filesystem version: 5, ZFS storage pool version: features support > (5000). The pool was imported from a previous 9.2 box on which it worked > without issue. > > I don't know if my problem is ZFS-related, but my ZFS use is why I noticed > it and I seem to be able to reproduce it reliably. Every so often, from > minutes to hours, my computer will freeze up while ZFS has been busy. This > happens during a resilver, a scrub, and a long-running process reading > millions of files from the pool. When it freezes, all output and input > freezes: tasks like zpool iostat -v 1 or top stop updating their output, > whether on the console or an ssh terminal over Ethernet. Pressing keys does > not garner a response.* Sometimes a freeze lasts minutes and then proceeds > on its own. Sometimes it goes on for hours. An action that typically, but > not always, jogs it is unplugging the USB keyboard -- the disk activity > resumes immediately, and any queued keyboard input immediately plays out > whether on the console or over ssh. Lastly, my ssh terminal (PuTTY) will > stay connected for hours during a freeze-up, *i.e.* the TCP circuit is not > closed or timed out, as opposed to closing pretty quickly after the server > is powered off. > > In all cases, the system clock lags by the sum of the durations of the > freezes. > > * During an initial resilver, I noticed that pressing a key such as Ctrl on > the USB keyboard would jog it, but pressing Ctrl or other keys doesn't jog > my process of long-running IO activity. But in all cases, even when > unplugging and replugging the USB keyboard doesn't jog it, Ctrl-Alt-Del > prompts an orderly shutdown. > > Debugging advise is very welcome! > > Thank you, > Christian > > _____________________________________________________ > 3425 SW 2nd Ave, #239 cell (352) 514-7411 > Gainesville, FL 32607-2813 dcamp@alumni.ufl.edu > > On this perfect day / Nothing's standing in my way... -Hoku > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Dennis Glatting <dg@pki2.com>
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