Date: Sat, 12 May 2012 12:07:20 +0200 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: freebsd-fs@freebsd.org Subject: Re: kern/167685: [zfs] ZFS on USB drive prevents shutdown / reboot Message-ID: <op.wd6w2ib88527sy@212-182-167-131.ip.telfort.nl> In-Reply-To: <201205112150.q4BLoHUD097623@freefall.freebsd.org> References: <201205112150.q4BLoHUD097623@freefall.freebsd.org>
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On Fri, 11 May 2012 23:50:17 +0200, Jeff Kletsky <freebsd@wagsky.com>
wrote:
> The following reply was made to PR kern/167685; it has been noted by
> GNATS.
>
> From: Jeff Kletsky <freebsd@wagsky.com>
> To: bug-followup@FreeBSD.org
> Cc:
> Subject: Re: kern/167685: [zfs] ZFS on USB drive prevents shutdown /
> reboot
> Date: Fri, 11 May 2012 14:41:03 -0700
>
> This is a multi-part message in MIME format.
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> Problem can be replicated by booting of a "memstick" (with a "spare" USB
> stick as /dev/da1) and then executing
> # dd if=/dev/zer of=/dev/da1 bs=64k
> # zpool create stick /dev/da1
> # reboot
> Problem has been reliably reproduced on the Atom 330 previously
> mentioned, as well as on an AMD A8-3870 with A75 chipset. It also can be
> replicated using VirtualBox running under Ubuntu on the AMD A8-3870
> system. It does not seem specific to one "flavor" of USB controller or
> driver.
> Using /usr/src/release/generate_release.sh and bisection, I have
> confirmed that
> * r227445 does not exhibit the behavior ("Copy stable/9 to releng/9.0 as
> part of the FreeBSD 9.0-RELEASE release cycle)
> * r229097 does not exhibit the behavior
> * r229281 -- FAIL by not rebooting under the conditions described above.
> Based on these results, I am suspicious of
> r229100 | hselasky | 2011-12-31 06:33:15 -0800 (Sat, 31 Dec 2011) | 6
> lines
> MFC r228709, r228711 and r228723:
> - Add missing unlock of USB controller's lock, when
> doing shutdown, suspend and resume.
> - Add code to wait for USB shutdown to be executed at system shutdown.
> - Add sysctl which can be used to skip this waiting.
> as being what brought the issue to the forefront.
> I am presently building r229099 and r229100 to confirm this suspicion.
> A potential, though untested workaround would be
> # sysctl hw.usb.no_shutdown_wait=1
I had/have the same problem with ZFS on my external USB backup-disk. I use
that sysctl since and can confirm that it works.
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