We have AIX 4.3.3 ML09 and AIX 5.1 ML01
I have narrowed the problem down, it is nothing to do with
uni/multiprocessor machines.
Both rsync 2.3.1 compiled by Bull in an installp and a gcc compiled
version of 2.4.5 ( by me ) both have exactly the same problem with SSH
3.1.p1 and both DONT have the problem with SSH 2.9.9p1 - so I assume this
is something highly specific to SSH 3.1.1.p1
Hope this helps - I am reluctant to start swapping signals around etc.
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.
>
>
>
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> Mark Pitt
> SP Administrator
> IBM, Campus Winterthur
> 058-333-1542
>
>
>
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