Date: Wed, 13 Jun 2012 18:20:10 GMT From: Richard Yao <ryao@gentoo.org> To: freebsd-fs@FreeBSD.org Subject: Re: kern/161968: [zfs] [hang] renaming snapshot with -r including a zvol snapshot causes total ZFS freeze/lockup Message-ID: <201206131820.q5DIKAVH051207@freefall.freebsd.org>
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The following reply was made to PR kern/161968; it has been noted by GNATS.
From: Richard Yao <ryao@gentoo.org>
To: bug-followup@FreeBSD.org
Cc: peter.maloney@brockmann-consult.de
Subject: Re: kern/161968: [zfs] [hang] renaming snapshot with -r including
a zvol snapshot causes total ZFS freeze/lockup
Date: Wed, 13 Jun 2012 14:17:33 -0400
I tried to reproduce this issue after being contacted about it by Peter
on freenode. I had to modify his script to destroy datasets
individually, instead of recursively by running the following command:
for i in $(zfs list -t snapshot -H -o name | grep
testcrashsnap${current}); do zfs destroy $i; done;
Otherwise, a "dataset is busy" failure occurs. This occurs on both
FreeBSD and Linux.
After doing that (and changing dataset=big to dataset=rpool), I was able
to test his script in virtual machines running Gentoo FreeBSD 9-RELEASE
and Gentoo Linux. I reproduced this issue on Gentoo FreeBSD 9.0-RELEASE.
On the other hand, Gentoo Linux successfully completed 6570 iterations.
This was with the ZFSOnLinux kernel modules. The code is available on
github:
https://github.com/zfsonlinux/zfs
The actual code that I used to test was a patched version that I develop
in a separate branch. You can find it here:
https://github.com/ryao/zfs/tree/gentoo
My current focus is on ZFS support in Gentoo Linux, but I would be happy
to help my FreeBSD counterparts troubleshoot this. Please do not
hesitate to contact me with questions.
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