openssh bugs - Nov 2004 - [Bug 953] openssh session hanging - prngd[671]: write() in socket_write() failed: Broken pipe

http://bugzilla.mindrot.org/show_bug.cgi?id=953

           Summary: openssh session hanging - prngd[671]: write() in
                    socket_write() failed: Broken pipe
           Product: Portable OpenSSH
           Version: 3.7.1p2
          Platform: Sparc
        OS/Version: Solaris
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: stanislaw.walczak at sympatico.ca


it occurs once or twice per day , any suggestion if this is openssh 
random number incompatibility issue ? 
 


server:Sun Enterprise E4500/E5500System 
SunOS 5.7 Generic_106541-32 sun4u sparc SUNW,Ultra-Enterprise 

part of the /var/adm/messages 

Nov  9 09:51:19 ashipts prngd[671]: write() in socket_write() failed: 
Broken pipe 
Nov  9 09:51:19 ashiptslast message repeated 30 times 
Nov  9 09:51:19 ashipts prngd[671]: closing service fd 15 for error.



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------- Additional Comments From djm at mindrot.org  2004-11-17 07:29 -------
This looks very much a like a prngd issue and not an openssh problem. Are there
any error messages from openssh?



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------- Additional Comments From dtucker at zip.com.au  2004-11-17 09:08 -------
Someone on comp.security.ssh suggested that there is a bug in prngd-0.9.26 that
might cause this problem.



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------- Additional Comments From stanislaw.walczak at sympatico.ca  2004-11-18
01:23 -------
The following freezes on ashipt after running for a random period of time. It 
usually happens within 15 minutes. I tracked it down to an error with the read
() from the remote server. 
#!/bin/ksh 
while (( 1 ))
do
ssh -vvv -l ipts ash mv /tmp/ssh_test /tmp/ssh_test.tmp
ssh -vvv -l ipts ashipts0 chmod 600 /tmp/ssh_test.tmp
ssh -vvv -l ipts ashipts0 mv /tmp/ssh_test.tmp /tmp/ssh_test
sleep 2
done



debug2: callback start
debug2: ssh_session2_setup: id 0
debug1: Sending command: mv /tmp/ssh_test /tmp/ssh_test.tmp
debug2: channel 0: request exec
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 16384
debug2: channel 0: rcvd adjust 32768
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
<freezes here, the remote command never executes either, although the debug 
statements say it did.  at this point the ssh connection hangs.  the ssh 
program is stuck on the local machine and connected sshd process is hung on the 
remote machine.  netstat shows that the connection is ESTABLISHED>




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------- Additional Comments From djm at mindrot.org  2004-12-06 16:48 -------
What version of prngd are you using? Is it the buggy one that Darren mentioned? 

Do you get hangs with multiple "openssl rand -base64 20480" runs?



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------- Additional Comments From stanislaw.walczak at sympatico.ca  2004-12-16
04:24 -------
prngd 0.9.25 (30 May 2002)



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------- Additional Comments From dtucker at zip.com.au  2004-12-16 11:41 -------
Does the problem occur if you upgrade prngd?

You also didn't answer Damien's question: if you stick "openssl
rand -base64
20480" in a loop does it hang or abort?



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------- Additional Comments From binder at arago.de  2004-12-16 23:27 -------
Actually, the bug I was talking about in comp.security.ssh was introduced in
prngd 0.9.25, so upgrading to the current version is definitely worth a try.



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