FreeBSD 13.0 hanging thread issue

Hi,
I made some tests moving a server from 12.2 to 13.0 and found that my building pipeline sometime blocks without reason.
Today I found this Ruby core thread https://bugs.ruby-lang.org/issues/18613 which looks the same.
FreeBSD 12.3 is not affected.

Is anybody else having this issue or knows how to reach a FreeBSD-kernel-threads-wizard?

Best
 
I sent a message to the FreeBSD threads mailing list, but nobody replied.
Is there a more suitable and active mailing list for such stuff?
 
Mailing -stable is certainly appropriate given that you have the link to the bug report.

This looks rather serious, regardless of whether it is a FreeBSD issue or whether ruby misuses some API or signals.
 
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