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Mark Pitt

2002-May-07 02:38 UTC

openssh 3.1 and rsync dont work

Maybe this is a ssh problem - but are you aware of the general issue ?

http://bugzilla.mindrot.org/show_bug.cgi?id=182

           Summary: ssh should still force SIGCHLD to be SIG_DFL when
                    calling ssh-rand-helper
           Product: Portable OpenSSH
           Version: 3.1p1
          Platform: ix86
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: ssh
        AssignedTo: openssh-unix-dev@mindrot.org


Programs that set a SIGCHLD handler before calling ssh wreak havoc on the
waitpid() calls within entropy.c and ssh-rand-helper. Entropy.c should set
the
SIGCHLD handler to SIG_DFL before calling ssh-rand-helper to avoid SIGCHLD
conflicts.

This was noticed when our ssh version was upgraded to 3.1.  Our local rsync
processes were failing with the following output from SSH:

Couldn't wait for child 'ls -alni /usr/adm' completion: No child
processes
Couldn't wait for child 'ls -alni /usr/mail' completion: No child
processes
Couldn't wait for child 'netstat -an' completion: No child processes
Couldn't wait for child 'netstat -in' completion: No child processes
Couldn't wait for child 'netstat -rn' completion: No child processes
Couldn't wait for child 'netstat -ia' completion: No child processes
Couldn't wait for child 'netstat -s' completion: No child processes
Couldn't wait for child 'netstat -is' completion: No child processes
Couldn't wait for child 'arp -a -n' completion: No child processes
Couldn't wait for child 'ifconfig -a' completion: No child processes
Couldn't wait for child 'ps -al' completion: No child processes
Couldn't wait for child 'ps -efl' completion: No child processes
Couldn't wait for child 'last' completion: No child processes
Couldn't wait for child 'sar -d' completion: No child processes
Couldn't wait for child 'uptime' completion: No child processes
Couldn't wait for child 'ipcs -a' completion: No child processes
Not enough entropy in RNG
ssh-rand-helper child produced insufficient data
unexpected EOF in read_timeout

It was discovered that rsync had set SIGCHLD to SIG_IGN prior to calling
ssh.
Setting SIGCHLD to SIG_DFL prior to forking ssh-rand-helper (seed_rng() in
entropy.c) solved this problem.



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Mark Pitt
SP Administrator
IBM, Campus Winterthur
058-333-1542

Dave Dykstra

2002-May-09 07:38 UTC

head link

openssh 3.1 and rsync dont work

I want to fix this in rsync too.  I developed what I think is a good fix
and now I'm trying to reproduce the problem so I can test whether or not
the fix worked.  The trouble is, I can't reproduce it with "-e
ssh" even
though I'm sure I'm running openssh 3.1p1 on solaris where it's
running the
ssh-rand-helper.  truss doesn't show rsync setting SIGCHLD to SIG_IGN.  I
found that there is one place in the rsync 2.5.5 code that sets SIGCHLD to
SIG_IGN, but it appears to only be in rsync --daemon mode, and it wouldn't
call ssh from there.

What version of rsync did you have the problem in, and what was the command
line you used?

- Dave Dykstra

On Tue, May 07, 2002 at 10:30:44AM +0200, Mark Pitt
wrote:> 
> Maybe this is a ssh problem - but are you aware of the general issue ?
> 
> http://bugzilla.mindrot.org/show_bug.cgi?id=182
> 
>            Summary: ssh should still force SIGCHLD to be SIG_DFL when
>                     calling ssh-rand-helper
>            Product: Portable OpenSSH
>            Version: 3.1p1
>           Platform: ix86
>         OS/Version: All
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: ssh
>         AssignedTo: openssh-unix-dev@mindrot.org
> 
> 
> Programs that set a SIGCHLD handler before calling ssh wreak havoc on the
> waitpid() calls within entropy.c and ssh-rand-helper. Entropy.c should set
> the
> SIGCHLD handler to SIG_DFL before calling ssh-rand-helper to avoid SIGCHLD
> conflicts.
> 
> This was noticed when our ssh version was upgraded to 3.1.  Our local rsync
> processes were failing with the following output from SSH:
> 
> Couldn't wait for child 'ls -alni /usr/adm' completion: No
child processes
> Couldn't wait for child 'ls -alni /usr/mail' completion: No
child processes
> Couldn't wait for child 'netstat -an' completion: No child
processes
> Couldn't wait for child 'netstat -in' completion: No child
processes
> Couldn't wait for child 'netstat -rn' completion: No child
processes
> Couldn't wait for child 'netstat -ia' completion: No child
processes
> Couldn't wait for child 'netstat -s' completion: No child
processes
> Couldn't wait for child 'netstat -is' completion: No child
processes
> Couldn't wait for child 'arp -a -n' completion: No child
processes
> Couldn't wait for child 'ifconfig -a' completion: No child
processes
> Couldn't wait for child 'ps -al' completion: No child processes
> Couldn't wait for child 'ps -efl' completion: No child
processes
> Couldn't wait for child 'last' completion: No child processes
> Couldn't wait for child 'sar -d' completion: No child processes
> Couldn't wait for child 'uptime' completion: No child processes
> Couldn't wait for child 'ipcs -a' completion: No child
processes
> Not enough entropy in RNG
> ssh-rand-helper child produced insufficient data
> unexpected EOF in read_timeout
> 
> It was discovered that rsync had set SIGCHLD to SIG_IGN prior to calling
> ssh.
> Setting SIGCHLD to SIG_DFL prior to forking ssh-rand-helper (seed_rng() in
> entropy.c) solved this problem.
> 
> 
> 
> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
> _______________________________________________
> openssh-unix-dev@mindrot.org mailing list
> http://www.mindrot.org/mailman/listinfo/openssh-unix-dev
> [prev in list] [next in list] [prev in thread] [next in thread]
> 
> Mark Pitt
> SP Administrator
> IBM, Campus Winterthur
> 058-333-1542
> 
> 
> 
> -- 
> To unsubscribe or change options:
http://lists.samba.org/mailman/listinfo/rsync
> Before posting, read: http://www.tuxedo.org/~esr/faqs/smart-questions.html

Jim Ogilvie

2002-May-09 13:16 UTC

head link

openssh 3.1 and rsync dont work

When we first switched to openssh 3.1 with rsync 2.3.1 we had the same
error from ssh-rand-helper. But after switching to rsync 2.5.5rc1 the
problem went away. (this is on AIX).

--
Jim Ogilvie

On Thu, 9 May 2002 09:34:57, Dave Dykstra wrote:
> I want to fix this in rsync too.  I developed what I think is a good fix
> and now I'm trying to reproduce the problem so I can test whether or
not
> the fix worked.  The trouble is, I can't reproduce it with "-e
ssh" even
> though I'm sure I'm running openssh 3.1p1 on solaris where it's
running
the> ssh-rand-helper.  truss doesn't show rsync setting SIGCHLD to SIG_IGN. 
I
> found that there is one place in the rsync 2.5.5 code that sets SIGCHLD
to> SIG_IGN, but it appears to only be in rsync --daemon mode, and it
wouldn't> call ssh from there.
>
> What version of rsync did you have the problem in, and what was the
command> line you used?
> - Dave Dykstra

Mark Pitt

2002-May-10 06:02 UTC

head link

openssh 3.1 and rsync dont work

Bug seems to have been fixed in -current release ( SSH Bug 182 )  not sure
when this will be available/official.

Going to stick to 2.9.9 on the one machine until resolved.

Mark Pitt
SP Administrator
IBM, Campus Winterthur
058-333-1542



Dave Dykstra <dwd@bell-labs.com> on 09.05.2002 16:34:57

Please respond to Dave Dykstra <dwd@bell-labs.com>

To:    Mark Pitt/Switzerland/Contr/IBM@IBMCH
cc:    rsync@lists.samba.org
Subject:    Re: openssh 3.1 and rsync dont work


I want to fix this in rsync too.  I developed what I think is a good fix
and now I'm trying to reproduce the problem so I can test whether or not
the fix worked.  The trouble is, I can't reproduce it with "-e
ssh" even
though I'm sure I'm running openssh 3.1p1 on solaris where it's
running the
ssh-rand-helper.  truss doesn't show rsync setting SIGCHLD to SIG_IGN.  I
found that there is one place in the rsync 2.5.5 code that sets SIGCHLD to
SIG_IGN, but it appears to only be in rsync --daemon mode, and it wouldn't
call ssh from there.

What version of rsync did you have the problem in, and what was the command
line you used?

- Dave Dykstra

On Tue, May 07, 2002 at 10:30:44AM +0200, Mark Pitt
wrote:>
> Maybe this is a ssh problem - but are you aware of the general issue ?
>
> http://bugzilla.mindrot.org/show_bug.cgi?id=182
>
>            Summary: ssh should still force SIGCHLD to be SIG_DFL when
>                     calling ssh-rand-helper
>            Product: Portable OpenSSH
>            Version: 3.1p1
>           Platform: ix86
>         OS/Version: All
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: ssh
>         AssignedTo: openssh-unix-dev@mindrot.org
>
>
> Programs that set a SIGCHLD handler before calling ssh wreak havoc on the
> waitpid() calls within entropy.c and ssh-rand-helper. Entropy.c should
set> the
> SIGCHLD handler to SIG_DFL before calling ssh-rand-helper to avoid
SIGCHLD> conflicts.
>
> This was noticed when our ssh version was upgraded to 3.1.  Our local
rsync> processes were failing with the following output from SSH:
>
> Couldn't wait for child 'ls -alni /usr/adm' completion: No
child
processes> Couldn't wait for child 'ls -alni /usr/mail' completion: No
child
processes> Couldn't wait for child 'netstat -an' completion: No child
processes
> Couldn't wait for child 'netstat -in' completion: No child
processes
> Couldn't wait for child 'netstat -rn' completion: No child
processes
> Couldn't wait for child 'netstat -ia' completion: No child
processes
> Couldn't wait for child 'netstat -s' completion: No child
processes
> Couldn't wait for child 'netstat -is' completion: No child
processes
> Couldn't wait for child 'arp -a -n' completion: No child
processes
> Couldn't wait for child 'ifconfig -a' completion: No child
processes
> Couldn't wait for child 'ps -al' completion: No child processes
> Couldn't wait for child 'ps -efl' completion: No child
processes
> Couldn't wait for child 'last' completion: No child processes
> Couldn't wait for child 'sar -d' completion: No child processes
> Couldn't wait for child 'uptime' completion: No child processes
> Couldn't wait for child 'ipcs -a' completion: No child
processes
> Not enough entropy in RNG
> ssh-rand-helper child produced insufficient data
> unexpected EOF in read_timeout
>
> It was discovered that rsync had set SIGCHLD to SIG_IGN prior to calling
> ssh.
> Setting SIGCHLD to SIG_DFL prior to forking ssh-rand-helper (seed_rng()
in> entropy.c) solved this problem.
>
>
>
> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
> _______________________________________________
> openssh-unix-dev@mindrot.org mailing list
> http://www.mindrot.org/mailman/listinfo/openssh-unix-dev
> [prev in list] [next in list] [prev in thread] [next in thread]
>
> Mark Pitt
> SP Administrator
> IBM, Campus Winterthur
> 058-333-1542
>
>
>
> --
> To unsubscribe or change options:
http://lists.samba.org/mailman/listinfo/rsync> Before posting, read:http://www.tuxedo.org/~esr/faqs/smart-questions.html

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