ssh connection failure "service `sshd' failed: signal 11 raised" (WinXP)

David Steenburgh
Wed Jul 25 14:42:00 GMT 2012

Yesterday, I updated Cygwin on three machines: one Win7 and two WinXP.
Since then, I have had occasional problems connecting to the WinXP
machines. So far, I have not had any issues connecting to the Win7
machine. Windows' application event logs contain the message "service
`sshd' failed: signal 11 raised" at the times of the connection
failures. /var/log/sshd.log has no relevant information; on one
machine it is simply an empty file.

Prior to this update, any connection failures were rare, and were the
result of user error or an offline machine. These failures appear to
be something else. I have not been able to determine how to reproduce
the problem, but it has happened multiple times, and at least once
with each of three ssh versions I have on hand. I routinely connect to
these machines from a Debian machine, with ssh version "OpenSSH_5.5p1
Debian-6+squeeze2, OpenSSL 0.9.8o 01 Jun 2010" and from a custom linux
machine with ssh version "OpenSSH_5.6p1, OpenSSL 1.0.0d 8 Feb 2011". I
rarely connect from the Windows machines, all of which have ssh
version "OpenSSH_6.0p1, OpenSSL 1.0.1c 10 May 2012".

I do not update Cygwin on a regular basis. According to
/var/log/setup.log the most recent previous update on any machine was
May 21; all three were updated on May 14.

Attached: Output from "cygcheck -s -v -r" on the two WinXP machines,
with minor redactions.
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