ZFS send core

Hi,

I am playing around a little with an 8.0 system on AMD64 and ZFS.

Since I wanted to try out gtp booting I thought I'd make a backup of my
system, repartition and restore from there.

This is just a test machine, so I don't need the backup to be really
safe, I thought I could try using zfs send functionality.

I gave the follwing commands:

zfs snapshot -r tank_at_test1

zfs send -vR tank_at_test1 > testdump

to create a file I could "receive" later with all the FS data and
configurations(I hope I'm getting this right, if I'm just doing
something stupid, sorry for the noise).

The second command simply dumped core right away.

These are the last few lines from a backtrace:

#0  0x000000080066d830 in zfs_prop_readonly () from /lib/libzfs.so.1
#1  0x0000000800653dda in fletcher_4_incremental_byteswap ()
   from /lib/libzfs.so.1
#2  0x0000000800654054 in fletcher_4_incremental_byteswap ()
   from /lib/libzfs.so.1
#3  0x00000008006548f0 in fletcher_4_incremental_byteswap ()
   from /lib/libzfs.so.1
#4  0x000000080065833a in zfs_send () from /lib/libzfs.so.1
#5  0x00000000004069a4 in ?? ()
#6  0x0000000000406176 in ?? ()

and it goes on up to #634.

I can reproduce this all the time.

I don't really know if this is zfs fault or I'm simply doing something
wrong. I am available to give back any more information needed, just
tell me what to look for.

BTW zfs send without the -R option works fine, but, as explained in the
man page, just dumps one zfs, not the whole hierarchy, which was what I
wanted to do.

Thank you.

-- 
Guido Falsi <mad_at_madpilot.net>