That was a really fun bug to hunt! And it should be fixed now.
https://github.com/kraih/mojo-pg/compare/b94da8531e98a9da9197dfb8cf29e4591ad9c8b4...4a3d2e43f6a20f216d93f5b2521715faf65e9bfd
Turns out DBD::Pg is innocent after all, and it was just a little bit of
Perl magic. We wrap the DBD::Pg file descriptor into a IO::Handle object,
to be able to use it with Mojo::IOLoop.
https://metacpan.org/source/GBARR/IO-1.25/lib/IO/Handle.pm#L327
But when the last reference to this wrapper is lost, Perl automatically
closes the underlying file descriptor. (Although $dbh->ping blocking
forever might still be a bug, i would expect for it to be able to detect
the closed file descriptor)
--
sebastian
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