[erlang-questions] Hang in ssl_connection:call/2 with ranch
Mon Apr 29 14:48:08 CEST 2019
It was solved in 21.1: https://bugs.erlang.org/browse/ERL-664
On 29/04/2019 14:40, Roger Lipscombe wrote:
> I found the underlying problem: the cert/key files are busted: <<"\n">>.
> The failure mode is ... surprising, though.
> On Fri, 26 Apr 2019 at 21:35, Roger Lipscombe <roger@REDACTED> wrote:
>> I'm looking at a deadlock on one of our servers (fortunately only in
>> staging bring-up, so it's not bothering anyone yet).
>> I've got a ranch protocol handler blocked in ranch:accept_ack, waiting
>> for a 'shoot' message. That's never being sent because the
>> ranch_conns_sup process is blocked in ssl:controlling_process ->
>> ssl_connection:new_user -> ssl_connection:call ->
>> gen_statem:call_dirty -> gen:do_call.
>> This is *not* happening on any of our other servers. If I restart the
>> node, it happens again when a client connects.
>> It's also (afaict) only affecting two of the configured ranch
>> listeners; the other two appear to be fine.
>> I've got a crash dump: all I can see is the ranch_conns_sup process is
>> blocking in gen_statem:call_dirty but the receiving process appears
>> (afaict) to be happily sitting in gen_statem:loop_receive, with
>> message_queue_len = 0, so I don't know why the call's not completing.
>> Any ideas? What else can I look at, assuming it continues to happen?
>> (OTP-21.0, ranch 1.3.2)
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