zfs discuss - Dec 2009 - Zfs upgrade freezes desktop

On snv_129, a zfs upgrade (*not* a zpool upgrade) from version 3 to version 4
caused the
desktop to freeze - no response to keyboard or mouse events and clock not
updated.

ermine%	uname -a
SunOS ermine 5.11 snv_129 i86pc i386 i86pc

ermine%	zpool upgrade
This system is currently running ZFS pool version 22.

The following pools are out of date, and can be upgraded.  After being
upgraded, these pools will no longer be accessible by older software versions.

VER  POOL
---  ------------
18   rpool

ermine%	zfs upgrade
This system is currently running ZFS filesystem version 4.

The following filesystems are out of date, and can be upgraded.  After being
upgraded, these filesystems (and any ''zfs send'' streams
generated from
subsequent snapshots) will no longer be accessible by older software versions.


VER  FILESYSTEM
---  ------------
 3   rpool/ROOT/snv_126
 3   rpool/ROOT/snv_127
 3   rpool/ROOT/snv_128a
 3   rpool/ROOT/snv_129
 3   rpool/export
 3   rpool/export/home

ermine% pfexec zfs upgrade rpool/ROOT/snv_126

[After 30-60 seconds, disk activity stopped and the desktop was frozen.  The zfs
command
  never appeared to finish.  I waited about 15 minutes before power cycling.]

After reboot the file system rpool/ROOT/snv_126 was indeed upgraded to zfs
version 4.

The same thing happened when  I upgraded file system rpool/ROOT/snv_125.

Has anyone else seen this?  I couldn''t find any related bugs.
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i have a problem which is perhaps related.

i installed opensolaris snv_130.
after adding 4 additional disks and creating a raidz on them with
compression=gzip and dedup enabled, i got reproducable system freeze (not sure,
but the desktop/mouse-coursor froze) directly after login - without actively
accessing the disks at all.

after removing the disks, all is fine again - no freeze.
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seems, my problem is unrelated.

after disabling the gui and working console only, i see no freezes. so it must
be a problem of the desktop/X environment and not kernel/zfs issue.

sorry for the noise.
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