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Date: Fri, 13 Feb 2015 14:19:59 -0500
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Subject: ssh / sshd processes not exiting cleanly
From: Cary Lewis <cary DOT lewis AT gmail DOT com>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=UTF-8
X-IsSubscribed: yes

I am running cygwin 1.7.34 on a server 2008R2 machine.

I have installed sshd and it seems to run fine (I can log in), but
when I try to exit, the ssh session doesn't terminate. I can force it
to exit by hitting Enter~., but that leaves a defunct sshd.exe lying
around.

When I enter in exit from a ssh session (logging in locally
automatically), I see this in the sshd log (I enabled DEBUG2 and
syslog):

Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug1: Received SIGCHLD.
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug1: session_by_pid: pid 4992
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug1:
session_exit_message: session 0 channel 0 pid 4992
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0:
request exit-status confirm 0
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug1:
session_exit_message: release channel 0
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: write failed
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: close_write
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: send eow
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: output
open -> closed
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug1:
session_pty_cleanup: session 0 release /dev/pty10
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: notify_done: reading
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0:
read<=0 rfd 8 len 0
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: read failed
Feb 13 14:14:21 ENGAGEIP-PRD sshd: PID 7064: debug2: channel 0: close_read

I dont see anything else in the log when I force the exit of the ssh
session with the
~.

Can someone explain what is going on?

Here is part of the cygcheck -s:

  Cygwin DLL version info:
        DLL version: 1.7.34
        DLL epoch: 19
        DLL old termios: 5
        DLL malloc env: 28
        Cygwin conv: 181
        API major: 0
        API minor: 285
        Shared data: 5
        DLL identifier: cygwin1
        Mount registry: 3
        Cygwin registry name: Cygwin
        Installations name: Installations
        Cygdrive default prefix:
        Build date:
        Shared id: cygwin1S5

Service             : sshd
Display name        : CYGWIN sshd
Current State       : Running
Controls Accepted   : Stop
Command             : /usr/sbin/sshd -D

openssh                   6.7p1-2            OK
openssl                   1.0.1k-1           OK

I don't see this behaviour on my Windows 7 machines/

Thanks.

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