[erlang-questions] gen_server not unregistering [20.1]

Heinrich Venter hfventer@REDACTED
Wed Mar 7 14:04:15 CET 2018

Thaks for the suggestion.

The gen_server already trap exits.

The instance I am using runs on R20.1. The instance it is communicating
with runs on R19. That instance does not show the same behavior even though
it uses the same code base for gen_rpc.
I am worried that it is some strangeness in R20 that I am not aware of.

On Wed, Mar 7, 2018 at 2:52 PM, Brujo Benavides <elbrujohalcon@REDACTED>

> Not sure if this will help at all, but try trapping exits in that
> gen_server (i.e. process_flag(trap_exit, true).) since terminate might not
> be evaluated unless you’re trapping exits. Ref: http://erlang.org/doc/
> man/gen_server.html#Module:terminate-2
> Good luck!
> ------------------------------
> *Brujo Benavides <http://about.me/elbrujohalcon>*
> On 7 Mar 2018, at 09:48, Heinrich Venter <hfventer@REDACTED> wrote:
> Hi all
> I have been experiencing the strangest thing.
> I am using an application (gen_rpc) that internally uses a gen_server to
> manage a gen_tcp outgoing socket.
> On closing of the socket form the server side, the message {tcp_closed,
> Socket} is received in the handle_info. This handle_info returns {stop,
> normal, State}
> The gen_server does not actually terminate. It does not call terminate and
> the PID remains registered locally. It actually keeps on processing
> messages which leads to badtcp reponses when it tires to send on the failed
> socket.
> Has any one seen something remotely like this, or have any suggestions of
> how to proceed?
> Links
> https://github.com/priestjim/gen_rpc
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