Freezes on crons with leading zeros in month number.

[tkukushkin]

Nomad version

All versions from 0.11.2 affected.

Issue

After #7894 cronexpr freezes forever on crons with leading zeros in number of month.

These are consequences of such behaviour:

• no new job could be deployed in cluster;
• no cron jobs are running;
• nomad agent-info | grep fsm_pending infinitely grows.

Reproduction steps

Create periodic job with leading zero in number of month, for example: 10 15 21 04 * * or run this code

[jrasell]

Hi @tkukushkin and thanks for the report. I have been able to reproduce this locally on 0.12.3 so will label accordingly.

[notnoop]

Thanks @tkukushkin for reporting the issue! I'm very sorry that you hit this condition and that the cluster broke :(. I have merged a fix and we plan to cut 0.12.4 in the next few days.

[tkukushkin]

Thanks for fast fix.

[github-actions]

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