Comment 21 for bug 1061069

One more related to comment #12:

http://www.cups.org/str.php?L4213
"CUPS crashes on shutdown when taking down Avahi threaded poll"

Furthermore:

A general comment from the CUPS author regarding CUPS Browsing:
http://www.cups.org/str.php?L4206
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Sorry, CUPS browsing is gone for good. There are too many problems
with the CUPS browsing protocol in modern network environments to
continue using/supporting it.

CUPS 1.6 supports DNS-SD for automatic client discovery of printers,
and future versions of CUPS will also support LDAP and SLP.
Unfortunately, it may take some time for desktop toolkits to support
dynamic printers, but the APIs are there in CUPS 1.6...
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One must take some time and wait until desktop toolkits adapted
to the CUPS 1.6 APIs and provide support for dynamic printers
before one can use CUPS > 1.5.x in "real-world environments".