BIND 9.18.48 Crash upon Serve Stale Enabling, with general: critical: exiting (due to assertion failure) and Recursion Loop Detected

[Ondřej Surý]

> On 3. 5. 2026, at 11:58, Ibrahim Almahfooz <ibrahim.nezar at sevennet.net> wrote:
> 
> Is the "recursion loop detected" message in the logs considered normal when stale serve is enabled? or is it happening due to misconfiguration?

All these domains are completely broken (each in a different way), so ... yes.

> We tried 9.18.48 (latest of 9.18.x) also crashed with the same error within a couple of minutes. We will perform another upgrade to version 9.20.22 and see what happens.

If you can reliably reproduce this, please fill https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issuable_template=Security_issue and make sure you follow the template.

Ondrej
--
Ondřej Surý (He/Him)
ondrej at isc.org

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