Crash between lock and start of a job renders it stuck

[schwarz-b5c]

If the RunCommand crashes after locking a job but before starting it the job is stuck being locked and won't be picked up again, even by the same worker. While unlikely this is not impossible. Here are some stats from a production system of ours:

> SELECT state, count(*) FROM jms_jobs GROUP BY state ORDER BY state;
   state    │  count  
────────────┼─────────
 canceled   │       6
 failed     │    3323
 finished   │ 1792415
 incomplete │       7
 pending    │       8
 running    │      18

All of the 8 pending jobs have been locked by a worker which crashed (or maybe was forcefully terminated) before starting the job. The jobs have been stuck in the pending state for over a month.

Unfortunately RunCommand::cleanUpStaleJobs() doesn't unlock jobs of the same worker. It probably should do so, right?

Some version information from the affected system:

CentOS 7.9.2009
Linux 3.10.0-1160.11.1.el7.x86_64
PHP 7.3.26 (with pcntl)
symfony/symfony 3.4.47
jms/job-queue-bundle 2.1.0