Mailing List Archive: [Bug 587] ssh returns non-zero return code but appears to work

[Bug 587] ssh returns non-zero return code but appears to work

bugzilla-daemon at mindrot

Jun 4, 2003, 1:01 PM

Post #1 of 7 (1402 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

Summary: ssh returns non-zero return code but appears to work
Product: Portable OpenSSH
Version: -current
Platform: All
OS/Version: AIX
Status: NEW
Severity: normal
Priority: P2
Component: ssh
AssignedTo: openssh-bugs@mindrot.org
ReportedBy: jcanger@att.com

Code in question is a shell script which invokes ssh on a remote system. A
non-zero (-1) return code results, however it appears the ssh does work. The
function of the ssh is to kick off another shell script on a remote system which
in turn invokes an scp on the originating system. The file that is requested by
the scp is always present on the remote server. Finally, after several attempts,
a zero return code is returned. I turned on verbose mode and compared the logged
messages from a successful attempt against the logged messages from the failed
attempts and saw no differences. What exactly is the meaning of a -1 Exit
Status?

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 4, 2003, 2:46 PM

Post #2 of 7 (1364 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

------- Additional Comments From markus@openbsd.org 2003-06-05 08:46 -------
exit(255) usually happens on fatal errors.

how can i reproduce your problem?

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 5, 2003, 6:16 AM

Post #3 of 7 (1370 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

------- Additional Comments From jcanger@att.com 2003-06-06 00:16 -------
Duplicating the bug:

Server A issues an ssh to Server B. The ssh kicks off a script on Server B. The
script on Server B scp's a file from Server A and stores it on Server B. Run
this repeatedly so see if any -1 exit status codes are seen, even though the scp
appears to function.

Note: I happened to notice the ssh verion on these pair of servers is OpenSSH
2.9.2. I thought I saw something somewhere where 2.9.2 returns inconsistent
exit status codes.

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 6, 2003, 2:34 PM

Post #4 of 7 (1372 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

------- Additional Comments From markus@openbsd.org 2003-06-07 08:34 -------
this works fine for me:

rm -f /tmp/ls2
while date; do
ssh -oBatchMode=yes -A localhost \
scp localhost:/bin/ls /tmp/ls2
if [ $? -ne 0 ]; then
echo ssh failed
fi
cmp /tmp/ls2 /bin/ls
if [ $? -ne 0 ]; then
echo scp failed
fi
rm -f /tmp/ls2
done

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 12, 2003, 2:46 AM

Post #5 of 7 (1369 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

------- Additional Comments From dtucker@zip.com.au 2003-06-12 20:46 -------
This is probably a dupe of bug #341 which has not been sighted for a long while
(version-wise).

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 12, 2003, 2:59 AM

Post #6 of 7 (1365 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

------- Additional Comments From dtucker@zip.com.au 2003-06-12 20:59 -------
Thinking about it this might be a variant of bug #375. If so it's been fixed
since 3.6p1, so please try to replicate with the latest version (3.6.1p2).

Previously sshd would deref some random location right at the end of the session
which would account for the random nature. If this is the case you'll see
Software Program errors in "errpt -a" on AIX in at least some cases.

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[Bug 587] ssh returns non-zero return code but appears to work [ In reply to ]

bugzilla-daemon at mindrot

Jun 12, 2003, 6:54 AM

Post #7 of 7 (1371 views)

http://bugzilla.mindrot.org/show_bug.cgi?id=587

jcanger@att.com changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE

------- Additional Comments From jcanger@att.com 2003-06-13 00:54 -------
Will instruct user to upgrade SSH version. This problem has not surfaced on any
other installations running more current SSH levels.

*** This bug has been marked as a duplicate of 341 ***

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