Public bug reported:
Reproducible on 14.04 and 14.10
In ssh's upstart config file, "expect stop" is used to signal upstart
when sshd is ready to accept connections. If the sshd config file is
broken, sshd terminates before it sends SIGSTOP to itself and this seems
to confuse upstart, such that it thinks the ssh job is still in
start/running state (with no associated PID.) In addition, I have
another upstart job set to trigger on "start on stopped ssh
RESULT=failed" which does _not_ trigger in this situation.
If I comment out the "expect stop" stanza from ssh.conf then the sshd
process properly ends up in "stop/waiting" and my other job triggers
properly.
Here is the DEBUG output from init when I start ssh with purposely
broken sshd_config file
Jul 19 16:47:43 patrick-vm kernel: [956961.180770] init: ssh goal changed from
stop to start
Jul 19 16:47:43 patrick-vm kernel: [956961.181056] init: ssh state changed from
waiting to starting
Jul 19 16:47:43 patrick-vm kernel: [956961.181333] init: event_new: Pending
starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.181373] init: Handling starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.181535] init: event_finished:
Finished starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.181548] init: ssh state changed from
starting to security-spawning
Jul 19 16:47:43 patrick-vm kernel: [956961.181814] init: ssh state changed from
security-spawning to security
Jul 19 16:47:43 patrick-vm kernel: [956961.182570] init: ssh state changed from
security to pre-starting
Jul 19 16:47:43 patrick-vm kernel: [956961.183593] init: ssh pre-start process
(43674)
Jul 19 16:47:43 patrick-vm kernel: [956961.183915] init: ssh state changed from
pre-starting to pre-start
Jul 19 16:47:43 patrick-vm kernel: [956961.187572] init: ssh pre-start process
(43674) exited normally
Jul 19 16:47:43 patrick-vm kernel: [956961.187664] init: ssh state changed from
pre-start to spawning
Jul 19 16:47:43 patrick-vm kernel: [956961.188352] init: ssh main process
(43676)
Jul 19 16:47:43 patrick-vm kernel: [956961.188512] init: ssh state changed from
spawning to spawned
Jul 19 16:47:43 patrick-vm kernel: [956961.193436] init: ssh main process
(43676) terminated with status 255
Jul 19 16:47:43 patrick-vm kernel: [956961.193467] init: ssh main process
ended, respawning
Jul 19 16:47:43 patrick-vm kernel: [956961.193531] init: ssh state changed from
spawned to post-starting
Jul 19 16:47:43 patrick-vm kernel: [956961.193896] init: ssh state changed from
post-starting to post-start
Jul 19 16:47:43 patrick-vm kernel: [956961.194419] init: ssh state changed from
post-start to running
Jul 19 16:47:43 patrick-vm kernel: [956961.194668] init: event_new: Pending
started event
Jul 19 16:47:43 patrick-vm kernel: [956961.194795] init: Handling started event
Jul 19 16:47:43 patrick-vm kernel: [956961.194886] init: job_register:
Registered instance /com/ubuntu/Upstart/jobs/startpar_2dbridge/ssh_2d_2dstarted
Jul 19 16:47:43 patrick-vm kernel: [956961.194976] init: job_register:
Registered instance /com/ubuntu/Upstart/jobs/startpar_2dbridge/ssh_2d_2dstarted
Jul 19 16:47:43 patrick-vm kernel: [956961.195058] init: job_register:
Registered instance /com/ubuntu/Upstart/jobs/startpar_2dbridge/ssh_2d_2dstarted
Jul 19 16:47:43 patrick-vm kernel: [956961.195164] init: job_register:
Registered instance /com/ubuntu/Upstart/jobs/startpar_2dbridge/ssh_2d_2dstarted
Jul 19 16:47:43 patrick-vm kernel: [956961.195256] init: job_register:
Registered instance /com/ubuntu/Upstart/jobs/startpar_2dbridge/ssh_2d_2dstarted
Jul 19 16:47:43 patrick-vm kernel: [956961.195314] init: job_class_induct_job:
New instance startpar-bridge (ssh--started)
Jul 19 16:47:43 patrick-vm kernel: [956961.195333] init: startpar-bridge
(ssh--started) goal changed from stop to start
Jul 19 16:47:43 patrick-vm kernel: [956961.195634] init: startpar-bridge
(ssh--started) state changed from waiting to starting
Jul 19 16:47:43 patrick-vm kernel: [956961.195960] init: event_new: Pending
starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.196154] init: Handling starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.196230] init: event_finished:
Finished starting event
Jul 19 16:47:43 patrick-vm kernel: [956961.196238] init: startpar-bridge
(ssh--started) state changed from starting to security-spawning
Jul 19 16:47:43 patrick-vm kernel: [956961.196459] init: startpar-bridge
(ssh--started) state changed from security-spawning to security
Jul 19 16:47:43 patrick-vm kernel: [956961.196667] init: startpar-bridge
(ssh--started) state changed from security to pre-starting
Jul 19 16:47:43 patrick-vm kernel: [956961.196864] init: startpar-bridge
(ssh--started) state changed from pre-starting to pre-start
Jul 19 16:47:43 patrick-vm kernel: [956961.197058] init: startpar-bridge
(ssh--started) state changed from pre-start to spawning
Jul 19 16:47:43 patrick-vm kernel: [956961.197616] init: startpar-bridge
(ssh--started) main process (43677)
Jul 19 16:47:43 patrick-vm kernel: [956961.197778] init: startpar-bridge
(ssh--started) state changed from spawning to spawned
Jul 19 16:47:43 patrick-vm kernel: [956961.199136] init: startpar-bridge
(ssh--started) state changed from spawned to post-starting
Jul 19 16:47:43 patrick-vm kernel: [956961.199455] init: startpar-bridge
(ssh--started) state changed from post-starting to post-start
Jul 19 16:47:43 patrick-vm kernel: [956961.199734] init: startpar-bridge
(ssh--started) state changed from post-start to running
Jul 19 16:47:43 patrick-vm kernel: [956961.199994] init: event_new: Pending
started event
Jul 19 16:47:43 patrick-vm kernel: [956961.200048] init: startpar-bridge
(ssh--started) main process (43677) exited normally
Jul 19 16:47:43 patrick-vm kernel: [956961.200165] init: startpar-bridge
(ssh--started) goal changed from start to stop
Jul 19 16:47:43 patrick-vm kernel: [956961.200421] init: startpar-bridge
(ssh--started) state changed from running to stopping
Jul 19 16:47:43 patrick-vm kernel: [956961.200683] init: event_new: Pending
stopping event
Jul 19 16:47:43 patrick-vm kernel: [956961.200706] init: Handling started event
Jul 19 16:47:43 patrick-vm kernel: [956961.200903] init: event_finished:
Finished started event
Jul 19 16:47:43 patrick-vm kernel: [956961.201160] init: Handling stopping event
Jul 19 16:47:43 patrick-vm kernel: [956961.201275] init: event_finished:
Finished stopping event
Jul 19 16:47:43 patrick-vm kernel: [956961.201285] init: startpar-bridge
(ssh--started) state changed from stopping to killed
Jul 19 16:47:43 patrick-vm kernel: [956961.201520] init: startpar-bridge
(ssh--started) state changed from killed to post-stopping
Jul 19 16:47:43 patrick-vm kernel: [956961.201756] init: startpar-bridge
(ssh--started) state changed from post-stopping to post-stop
Jul 19 16:47:43 patrick-vm kernel: [956961.202233] init: startpar-bridge
(ssh--started) state changed from post-stop to waiting
Jul 19 16:47:43 patrick-vm kernel: [956961.202498] init: event_new: Pending
stopped event
Jul 19 16:47:43 patrick-vm kernel: [956961.202528] init: job_change_state:
Destroyed inactive instance startpar-bridge (ssh--started)
Jul 19 16:47:43 patrick-vm kernel: [956961.203037] init: Handling stopped event
Jul 19 16:47:43 patrick-vm kernel: [956961.203173] init: event_finished:
Finished stopped event
Jul 19 16:47:43 patrick-vm kernel: [956961.203446] init: event_finished:
Finished started event
My goal is to have an upstart job trigger in the event that sshd_config is
broken and do something helpful , e.g. start another sshd on another port with
a known good config so I can get back into the box to fix the problem.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1476753
Title:
When sshd exits because of a bad configuration, upstart claims the job
is in "start/running" with no PID
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