Ondřej Surý cd632ad31d Implement dns_db node tracing ...

This implements node reference tracing that passes all the internal
layers from dns_db API (and friends) to increment_reference() and
decrement_reference().

It can be enabled by #defining DNS_DB_NODETRACE in <dns/trace.h> header.

The output then looks like this:

    incr:node:check_address_records:rootns.c:409:0x7f67f5a55a40->references = 1
    decr:node:check_address_records:rootns.c:449:0x7f67f5a55a40->references = 0

    incr:nodelock:check_address_records:rootns.c:409:0x7f67f5a55a40:0x7f68304d7040->references = 1
    decr:nodelock:check_address_records:rootns.c:449:0x7f67f5a55a40:0x7f68304d7040->references = 0

There's associated python script to find the missing detach located at:
https://gitlab.isc.org/isc-projects/bind9/-/snippets/1038

2023-02-28 11:44:15 +01:00

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