[bug] Occasional deadlock leading to memory leak since Centrifugo v5.3.2

[FZambia]

Describe the bug. A clear and concise description of what the bug is.

There was a report in Telegram about memory (goroutine) leak in Centrifugo v5.4.1.

It can look like this on your dashboards:

After investigation I think I've spotted the root cause of deadlock and now working on the fix. The issue was introduced in Centrifugo v5.3.2.

Conditions under which this happen depend on load profile, so Centrifugo v5.4.1 can work fine for particular setups. But if you hit the problem - the solution is to switch to Centrifugo v5.3.1 until the fix is released.

[FZambia]

Centrifugo v5.4.2 addresses it