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there were 7 scheduled cluster jobs in total - and all were 2 days old. So it's possible some worker restarted and created this mess.

Some of the jobs which are currently stuck in scheduled state are not part of the problem. For instance https://openqa.suse.de/tests/2300326#dependencies and https://openqa.suse.de/tests/2300326#dependencies are simply stuck because they require the worker class 64bit-mlx_con5 but only worker with class 64bit-mlx_con5_DISABLED are available on OSD. It seems that somebody intentionally postponed the execution of these jobs.

The problem that one job in the parallel cluster is stuck in scheduled state (or get canceled/skipped) can be observed also without previous restart. So likely the problem lies in the scheduling and not the restart. For instance slenkins-tests-git-control@64bit is one of those tests which sometimes are stuck in scheduled state (https://openqa.suse.de/tests/2353721, https://openqa.suse.de/tests/2351382, https://openqa.suse.de/tests/2349564). But it is a sporadic issue, the test also gets executed quite often and then passes (https://openqa.suse.de/tests/2357039). Speaks for a bug in the scheduler causing clusters only partially scheduled.

Theory: The job which is stuck in scheduled state is excluded by OpenQA::Scheduler::Scheduler::update_scheduled_jobs because a Gru task it depends on is still running. That function calls $job->cluster_jobs to compute the cluster considering all jobs. But if I read the code correctly it will in the end nevertheless only consider those jobs without a Gru task.

[2019-01-10T02:11:14.0502 CET] [debug] [pid:7423] Allocated: { job => 2364271, worker => 575 }
[2019-01-10T02:11:14.0501 CET] [debug] [pid:7423] Allocated: { job => 2364272, worker => 595 }
[2019-01-10T02:11:14.0504 CET] [debug] [pid:7423] Allocated: { job => 2364326, worker => 896 }

So that part still worked

But https://openqa.suse.de/admin/workers/896 reported the last job 29 days ago - it looks broken.

That worker host in general is troubled for a while it seems:

Jan 10 07:25:16 openqaworker3 worker[21681]: [error] Unable to upgrade connection for host "openqa.suse.de" to WebSocket: 500. Apache modules proxy_wstunnel and rewrite enabled?
Jan 10 07:25:17 openqaworker3 worker[21679]: [error] Unable to upgrade connection for host "openqa.suse.de" to WebSocket: 500. Apache modules proxy_wstunnel and rewrite enabled?

So the next thing that happened, was:

[2019-01-10T02:11:12.0381 CET] [debug] [pid:4246] message sent to 896 for job 2364326
[2019-01-10T02:11:54.0096 CET] [debug] [pid:4246] Found Job(2364326) in DB from worker_status update sent by Worker(896)
[2019-01-10T02:11:54.0127 CET] [debug] [pid:4246] Job '2364326' reset to 'scheduled' state

and then it was assigned to 633, which also returned the favor:

[2019-01-10T02:15:39.0730 CET] [debug] [pid:4246] message sent to 633 for job 2364326
[2019-01-10T02:16:50.0150 CET] [debug] [pid:4246] Found Job(2364326) in DB from worker_status update sent by Worker(633)
[2019-01-10T02:16:50.0176 CET] [debug] [pid:4246] Job '2364326' reset to 'scheduled' state

So the job was 'assigned' twice - and the parallel_failed should have happened here:

[2019-01-10T02:16:20.0219 CET] [debug] POST "/api/v1/jobs/2364271/set_done" (9e769989)

And at that time the job was assigned to 633 - and once 633 gave up, the job was 'reset to scheduled'. And that's what I suspected from the beginning.

The problem is that there are far more bugs in play here:

Jan 10 02:16:20 openqaworker3 worker[21693]: [warn] Received command cancel for different job id 2364326 (our 2363137). Ignoring!

Why did worker3:10 got 326 assigned if it wasn't free? Why is worker3:1 dead for a month without us noticing, while worker3:10 is fine? Why did the scheduler not realize the cluster is incomplete?

Jan 10 07:25:16 openqaworker3 worker[21681]: [error] Unable to upgrade connection for host "openqa.suse.de" to WebSocket: 500. Apache modules proxy_wstunnel and rewrite enabled?

I noticed those messages on my remote worker too. Worker can't reconnect (Unable to upgrade connection..) after "systemctl restart openqa-worker@1" until I reboot server with webui.
No idea what's the cause.

the full story is even more complex:

[2019-01-10T02:11:54.0080 CET] [debug] [pid:4246] Received from worker "896" worker_status message "$VAR1 = {
[2019-01-10T02:11:54.0083 CET] [debug] [pid:4246] Updated worker seen from worker_status
[2019-01-10T02:11:54.0096 CET] [debug] [pid:4246] Found Job(2364326) in DB from worker_status update sent by Worker(896)
[2019-01-10T02:11:54.0096 CET] [debug] [pid:4246] Received request has id: 2326956
[2019-01-10T02:11:54.0110 CET] [debug] [pid:4246] Worker(896) for Job(2364326) has token u20HTTwQ1lLTrpi2
[2019-01-10T02:11:54.0110 CET] [debug] [pid:4246] Received request has token: BWDiHETB9O3uLSLD
[2019-01-10T02:11:54.0112 CET] [debug] [pid:4246] Possibly worker 896 should be freed.
[2019-01-10T02:11:54.0127 CET] [debug] [pid:4246] Job '2364326' reset to 'scheduled' state

So worker said it's working on 2326956, websocket said 'WTF you should work on 2364326', canceled the job and the worker said 'hey, why? I work on 2363137'.

Very confused workers :(

I really thought hard on the cycling tour home how to avoid this mess - and our options are really limited, but I guess we should try :(