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Message #04793
[Bug 1329939] Re: Service ssh stop/start/restart hangs
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: openssh (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1329939
Title:
Service ssh stop/start/restart hangs
Status in “openssh” package in Ubuntu:
Confirmed
Bug description:
When using "service ssh," all of the actions cause the service process
to hang, with varying results on the sshd process.
root@localdev14:~# ps -ef | grep ssh
root 28264 1 0 15:39 ? 00:00:00 /usr/sbin/sshd -D
root 28353 28264 0 15:46 ? 00:00:00 sshd: user [priv]
user 28402 28353 0 15:46 ? 00:00:00 sshd: user@pts/0
root 28433 28418 0 15:47 pts/0 00:00:00 grep --color=auto ssh
root@localdev14:~# service ssh stop
(after a couple of minutes)
^C
root@localdev14:~# ps -ef | grep ssh
root 28264 1 0 15:39 ? 00:00:00 /usr/sbin/sshd -D
root 28353 28264 0 15:46 ? 00:00:00 sshd: user [priv]
user 28402 28353 0 15:46 ? 00:00:00 sshd: user@pts/0
root 28444 28418 0 15:48 pts/0 00:00:00 grep --color=auto ssh
A trace on /usr/sbin/service shows that it's hanging at /sbin/stop;
root@localdev14:~# bash -x /usr/sbin/service ssh stop 2>&1 | tee /tmp/ssh.restart
++ basename /usr/sbin/service
+ VERSION='service ver. 0.91-ubuntu1'
++ basename /usr/sbin/service
+ USAGE='Usage: service < option > | --status-all | [ service_name [ command | --full-restart ] ]'
+ SERVICE=
+ ACTION=
+ SERVICEDIR=/etc/init.d
+ OPTIONS=
+ '[' 2 -eq 0 ']'
+ cd /
+ '[' 2 -gt 0 ']'
+ case "${1}" in
+ '[' -z '' -a 2 -eq 1 -a ssh = --status-all ']'
+ '[' 2 -eq 2 -a stop = --full-restart ']'
+ '[' -z '' ']'
+ SERVICE=ssh
+ shift
+ '[' 1 -gt 0 ']'
+ case "${1}" in
+ '[' -z ssh -a 1 -eq 1 -a stop = --status-all ']'
+ '[' 1 -eq 2 -a '' = --full-restart ']'
+ '[' -z ssh ']'
+ '[' -z '' ']'
+ ACTION=stop
+ shift
+ '[' 0 -gt 0 ']'
+ '[' -r /etc/init/ssh.conf ']'
+ which initctl
+ initctl version
+ grep -q upstart
+ case "${ACTION}" in
+ exec stop ssh
^C
root@localdev14:~# ps -ef | grep sshd
root 28264 1 0 15:39 ? 00:00:00 /usr/sbin/sshd -D
root 28353 28264 0 15:46 ? 00:00:00 sshd: user [priv]
user 28402 28353 0 15:46 ? 00:00:00 sshd: user@pts/0
root 28478 28418 0 15:54 pts/0 00:00:00 grep --color=auto sshd
Restarting the service gets a different error;
root@localdev14:~# bash -x /usr/sbin/service ssh restart 2>&1 | tee /tmp/ssh.restart
++ basename /usr/sbin/service
+ VERSION='service ver. 0.91-ubuntu1'
++ basename /usr/sbin/service
+ USAGE='Usage: service < option > | --status-all | [ service_name [ command | --full-restart ] ]'
+ SERVICE=
+ ACTION=
+ SERVICEDIR=/etc/init.d
+ OPTIONS=
+ '[' 2 -eq 0 ']'
+ cd /
+ '[' 2 -gt 0 ']'
+ case "${1}" in
+ '[' -z '' -a 2 -eq 1 -a ssh = --status-all ']'
+ '[' 2 -eq 2 -a restart = --full-restart ']'
+ '[' -z '' ']'
+ SERVICE=ssh
+ shift
+ '[' 1 -gt 0 ']'
+ case "${1}" in
+ '[' -z ssh -a 1 -eq 1 -a restart = --status-all ']'
+ '[' 1 -eq 2 -a '' = --full-restart ']'
+ '[' -z ssh ']'
+ '[' -z '' ']'
+ ACTION=restart
+ shift
+ '[' 0 -gt 0 ']'
+ '[' -r /etc/init/ssh.conf ']'
+ which initctl
+ initctl version
+ grep -q upstart
+ case "${ACTION}" in
+ stop ssh
stop: Job has already been stopped: ssh
+ :
+ exec start ssh
^C
root@localdev14:~# ps -ef | grep sshd
root 28264 1 0 15:39 ? 00:00:00 /usr/sbin/sshd -D
root 28353 28264 0 15:46 ? 00:00:00 sshd: user [priv]
user 28402 28353 0 15:46 ? 00:00:00 sshd: user@pts/0
root 28495 28418 0 15:56 pts/0 00:00:00 grep --color=auto sshd
As you can see from the PID, the sshd service was in fact not stopped.
If you kill the sshd manually, and try to use the service command to
start the process, that hangs as well, although the process is
actually started;
root@localdev14:~# bash -x /usr/sbin/service ssh start 2>&1 | tee /tmp/ssh.start
++ basename /usr/sbin/service
+ VERSION='service ver. 0.91-ubuntu1'
++ basename /usr/sbin/service
+ USAGE='Usage: service < option > | --status-all | [ service_name [ command | --full-restart ] ]'
+ SERVICE=
+ ACTION=
+ SERVICEDIR=/etc/init.d
+ OPTIONS=
+ '[' 2 -eq 0 ']'
+ cd /
+ '[' 2 -gt 0 ']'
+ case "${1}" in
+ '[' -z '' -a 2 -eq 1 -a ssh = --status-all ']'
+ '[' 2 -eq 2 -a start = --full-restart ']'
+ '[' -z '' ']'
+ SERVICE=ssh
+ shift
+ '[' 1 -gt 0 ']'
+ case "${1}" in
+ '[' -z ssh -a 1 -eq 1 -a start = --status-all ']'
+ '[' 1 -eq 2 -a '' = --full-restart ']'
+ '[' -z ssh ']'
+ '[' -z '' ']'
+ ACTION=start
+ shift
+ '[' 0 -gt 0 ']'
+ '[' -r /etc/init/ssh.conf ']'
+ which initctl
+ initctl version
+ grep -q upstart
+ case "${ACTION}" in
+ exec start ssh
^C
root@localdev14:~# ps -ef | grep sshd
root 28353 1 0 15:46 ? 00:00:00 sshd: user [priv]
user 28402 28353 0 15:46 ? 00:00:00 sshd: user@pts/0
root 28510 1 0 15:58 ? 00:00:00 /usr/sbin/sshd -D
root 28515 28418 0 15:59 pts/0 00:00:00 grep --color=auto sshd
I've been able to reproduce this problem both after a reboot, and from the console, with no user sshd process running.
On a side note, the sshd_config file appears to be sane. At least no
errors are being presented, so I don't believe this is OpenSSH
related.
root@localdev14:~# sshd -T
port 22
protocol 2
addressfamily any
listenaddress 0.0.0.0:22
listenaddress [::]:22
usepam 1
serverkeybits 1024
logingracetime 120
keyregenerationinterval 3600
x11displayoffset 10
maxauthtries 6
maxsessions 10
clientaliveinterval 0
clientalivecountmax 3
permitrootlogin no
ignorerhosts yes
ignoreuserknownhosts no
rhostsrsaauthentication no
hostbasedauthentication no
hostbasedusesnamefrompacketonly no
rsaauthentication yes
pubkeyauthentication yes
passwordauthentication yes
kbdinteractiveauthentication yes
challengeresponseauthentication no
printmotd no
printlastlog yes
x11forwarding yes
x11uselocalhost yes
strictmodes yes
tcpkeepalive yes
permitemptypasswords no
permituserenvironment no
uselogin no
compression delayed
gatewayports no
usedns yes
allowtcpforwarding yes
useprivilegeseparation yes
pidfile /var/run/sshd.pid
xauthlocation /usr/bin/xauth
authorizedkeysfile %h/.ssh/authorized_keys
authorizedkeysfile2 %h/.ssh/authorized_keys
loglevel INFO
syslogfacility AUTH
hostkey /etc/ssh/ssh_host_rsa_key
hostkey /etc/ssh/ssh_host_dsa_key
hostkey /etc/ssh/ssh_host_ecdsa_key
acceptenv LANG
acceptenv LC_*
subsystem sftp /usr/lib/openssh/sftp-server
maxstartups 10:100:10
permittunnel no
ipqos 0x10 0x08
permitopen any
root@localdev14:~#
System Specs:
root@localdev14:~# lsb_release -rd
Description: Ubuntu 14.04 LTS
Release: 14.04
root@localdev14:~# apt-cache policy upstart
upstart:
Installed: 1.12.1-0ubuntu4
Candidate: 1.12.1-0ubuntu4
Version table:
*** 1.12.1-0ubuntu4 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
100 /var/lib/dpkg/status
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