zfs send/recv invalid data

[Steven Hartland]

----- Original Message ----- 
From: "Larry Rosenman" <ler at lerctr.org>
To: "Steven Hartland" <killing at multiplay.co.uk>
Cc: "Martin Simmons" <martin at lispworks.com>; <tevans.uk at googlemail.com>; <freebsd-fs at freebsd.org>; <ronald-freebsd8 at klop.yi.org>
Sent: Wednesday, March 06, 2013 11:16 PM
Subject: Re: zfs send/recv invalid data


> On 2013-03-06 17:00, Steven Hartland wrote:
>> ----- Original Message ----- From: "Larry Rosenman" <ler at lerctr.org>
>>> # cat send.stream | ssh root at home openssl md5
>>> (stdin)= 9cd1d73ea8411f1c222bc90e7bea3d33
>>> # uname -a
>>> FreeBSD thebighonker.lerctr.org 8.3-STABLE FreeBSD 8.3-STABLE #54 
>>> r247820: Mon Mar  4 18:08:11 CST 2013     
>>> root at thebighonker.lerctr.org:/usr/obj/usr/src/sys/THEBIGHONKER  amd64
>>> #
>>> # exec csh
>>> root at borg:/home/ler # pwd
>>> /home/ler
>>> root at borg:/home/ler # ssh tbh "cat 
>>> /home/ler/public_html/ZFS_RECV/send.stream | ssh root at home.lerctr.org 
>>> openssl md5"
>>> (stdin)= 9cd1d73ea8411f1c222bc90e7bea3d33
>>> root at borg:/home/ler # uname -a
>>> FreeBSD borg.lerctr.org 10.0-CURRENT FreeBSD 10.0-CURRENT #124 
>>> r247826: Mon Mar  4 19:59:08 CST 2013     
>>> root at borg.lerctr.org:/usr/obj/usr/src/sys/BORG-DTRACE  amd64
>>> root at borg:/home/ler #
>> 
>> When you run a command from ssh it will run as the target users shell
>> so for csh if there is something bad in .cshrc or iirc .profile then
>> you may get something output purely by logging in.
>> 
>> So ensure you shell config's for the user on the target machine are
>> clean.
>> 
>> You can confirm this by comparing the output from the following
>> two commands run from the sending machine:-
>> md5 send.stream
>> cat send.stream | ssh root at home.lerctr.org "cat" |md5
>> 
>> If these two commands produce different md5's then the login
>> shell for root on home.lerctr.org is outputing something
>> even when there is no terminal.
>> 
>> You should be able to see what the shell is outputting using:-
>> echo -n '' | ssh root at home.lerctr.org "cat" > 1.log
>> 
>> After running this 1.log should be 0 bytes if its not your
>> shell is definitely your problem and I'd start by looking
>> at .cshrc and .profile for this user, or even the globals
>> for these in /etc/
>> 
> I've done that, and get identical md5's.....
> 
> I'm at a loss.

I believe what you ran was similar but not identical, if you
check the quoting subtly different.

I'm not sure that will have any effect but both of the above
are worth running just to confirm.

    Regards
    Steve

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