[squid-users] FATAL: Dying from an exception handling failure; exception: [no active exception]

[Alex Rousskov]

On 7/28/23 05:05, Waldemar Brodkorb wrote:

> we recently updated our proxies to 6.1 on Ubuntu 22.04 (x86_64) and
> now seeing sometime following fatal errors in the cache.log:
> 
> FATAL: Dying from an exception handling failure; exception: [no
> active exception]
> 
> What does it mean and how can I further analyze the problem?

It means your Squid hit a bug and quit.

* If you configure your environment to allow Squid to dump its core, the 
crash should leave a core file that you can analyze with a debugger. 
Please be mindful of Ubuntu's apport attempts to "help" you.

* Alternatively, you can start Squid from the debugger, but that usually 
requires more work/hacks. See Ralf's response for helpful hints.
  There is one known Squid v6+ bug with the same symptom. If your 
debugger backtrace shows functions with letters "Ftp" in their names, 
then you are probably hitting that bug. That bug has a proposed fix. If 
you can, please test it: 
https://bugs.squid-cache.org/show_bug.cgi?id=5290#c2


Thank you,

Alex.