LOR during unmount on 11.0-ALPHA5

From: Michael Plass <mfp49_freebsd_at_plass-family.net>
Date: Sat, 2 Jul 2016 15:40:38 -0700
I'm seeing some LORs on a fresh install of 11.0-ALPHA5 - single-disk zfs, unencrypted.
There's some similarity to kern/209816, but mine are on unmount.

FreeBSD xx 11.0-ALPHA5 FreeBSD 11.0-ALPHA5 #0 r302164: Fri Jun 24 02:51:52 UTC 2016     root_at_releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64


1st 0xfffff80007cd0b78 zfs (zfs) _at_ /usr/src/sys/kern/vfs_mount.c:1222
2nd 0xfffff8002d33d418 zfs_gfs (zfs_gfs) _at_ /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/gfs.c:484

More details (with stacks) are at
    https://gist.github.com/mfplass/fe9c6b84a8f14839bbc2b2b2e03272ca

It seems to happen on shutdown. I don't think I've seen it hang.
The log shows one involving ufs instead of zfs, unfortunately without a stack.
I'm not sure why that is, unless it was the installation memstick.

There's another, probably unrelated, LOR that I'll put in a second message.

Thanks,
- Michael
Received on Sat Jul 02 2016 - 20:49:24 UTC

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