Date: Wed, 13 Feb 2013 08:37:01 -0800 From: Tim Gustafson <tjg@ucsc.edu> To: freebsd-fs@freebsd.org Subject: FreeBSD 9.1 ZFS-Related Crash Message-ID: <CAPyBAS63akKq5DoU1W_TTKfDcNHzrO4Z_uiOwEXKdVEBhpZSRA@mail.gmail.com>
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Hi, I'm not sure how to report this as an official bug, or if it even qualifies as one. We're running ZFS on a FreeBSD 9.1 machine. Our zpool is version 28 and our zfs file systems are version 5. Some of our users still have individual ZFS file systems for their home directories. One in particular also has a bunch of cron jobs that run every few minutes on different systems that access his home directory via NFSv3. In order to take his home directory off-line, I removed him from /etc/exports and re-started mountd. When I attempted to change the mount point of his ZFS file system, the server crashed. When the server came back up and I attempted to change the mount point a second time, the server crashed again. I've done this hundreds of times for other users, and have had maybe 5 or 6 other crashes on other people's home directories as well. So, it's a somewhat reproducible bug, but it's not very consistent. My best guess is that if you attempt to un-mount a ZFS file system when there is still some sort of NFS activity, it causes the system to crash. But, most of the time it seems that if you attempt to unmount a file system that is still in use, the unmount command returns an error stating that the file system is still in use. So there's some certain type of NFS activity that seems to cause the issue - whether it's perhaps trying to open a file right as the file system is being unmounted, or maybe having a file locked but not open...I just don't know which condition is the culprit. I have some spare hardware that I could use to attempt to reproduce this crash, but I wanted to ping the group first to see if anyone else has seen this issue. Is this a known issue? Has anyone else seen this sort of behavior? -- Tim Gustafson tjg@ucsc.edu 831-459-5354 Baskin Engineering, Room 313A
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