Doesn't work on Ubuntu 17.10 (artful)

[sapphirecat]

The Ubuntu repo's version 0.23, and the latest 0.25 tarball, both exhibit the same behavior: they don't think they successfully connected, and they don't perform any operations.

This happens against real memcached, and 0.23 was also observed to fail when sending to a Memcached::Server.

• server_versions returns {}
• set and get return undef
• tcpdump sees 6 (3-way setup, 3-way teardown) packets of 0 bytes each, no other traffic
• make test for 0.25 skips everything because it thinks there's no memcached server
• Cache::Memcached works fine (tested on real memcached only)
• Everything is fine on Ubuntu 17.04 (zesty, shipped with version 0.23).

The memcached server can be located with sudo netstat -lntp and ps; its cmdline is /usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1

AFAICT, the only changes in memcached or C::M::F between the Ubuntu releases is "No-change rebuild against libevent-2.1-6" for memcached, and the updated Perl version (5.26).

[sapphirecat]

I've been trying to characterize this better. I installed Perlbrew, and found the package fails under Artful with brewed 5.24.3 and 5.26.1.

I built with make OPTIMIZE='-O2 -Wall -Wextra -g' to possibly get some more help; the command output with 5.24.3 is attached in cmf-524.log.

I'm attaching my testing script as well,
mcd-test.zip

[sapphirecat]

Full test results of version 0.25:

• ubuntu zesty, system perl 5.24.1: OK
• ubuntu artful, system perl 5.26.0: fail
• ubuntu artful, brewed perl 5.24.3: fail
• ubuntu artful, brewed perl 5.26.1: fail
• debian stretch, brewed perl 5.26.1: OK
• debian buster, brewed perl 5.26.1: OK
• debian buster, brewed perl 5.26.0: OK
• debian buster, system perl 5.26.0: OK

"OK" represents make test fully passing; "fail" represents all the tests being skipped due to no connection.

Debian stretch is stable, and buster is testing.

Unless further info is requested, I think I'm going to quit worrying about it at this point. It's pretty clear Ubuntu specifically has broken something. I can switch our code to vanilla Cache::Memcached which works on artful.