[Bug libc/17977] gethostbyname_r hangs forever

["eric.newton at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17977

--- Comment #3 from Eric Newton <eric.newton at gmail dot com> ---
The error did cause service availability failures.

Note:
* it requires the "reorder on" configuration
* it requires at least 3 threads attempting to run the _res_hconf_reorder_addrs
function concurrently to lock up a single thread
* these concurrent accesses must be on the first run of the function
* future requests of _res_hconf_reorder_addrs will work just fine

In this case, a component of a large distributed database was asked by hundred
of other services to perform work at the moment it came online. These requests
locked other resources before performing a name lookup.

It would be hard, but not impossible to do this deliberately to a service.

It was not deliberately caused when it was found.  Just (un)lucky.

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