At least in version 12.2.0, the code in cdr.c appears to create CDR
records for each pair of users in a conference. This is quadratic
and would seem to be an issue with large conferences.
I got two Asterisk crashes when a lot of people tried to dial into a
conference. They appear quite related to
https://issues.asterisk.org/jira/browse/ASTERISK-24758
There are thousands of CDR entries on the chain. I believe this is
due to the quadratic behavior above. Not all of the "last" fields
point to the same entry, which is peculiar, though.
I think that my crash was caused by a stack overflow in recursive calls
to delete the huge CDR chain (over 7,000 entries).
Why are all these CDR entries made?
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