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From "Darryl L. Pierce" <dpie...@redhat.com>
Subject Can only access ~24 selectables before blowing up...
Date Wed, 09 Apr 2014 19:58:38 GMT
In working with passive mode and selectables, I've hit a strange
reproducible problem.

I have a simple add-on to Messenger that lets me have it push incoming
messages to an EventMachine channel [1]. If I send messages to the echo
example app (it's not echoing yet), it will consistently receive around
24 messages before dying. I've tried putting delays in between the
sends. I've sent the messages in batches (tried 100, tried sending in
units of 10 and 5). Each time it blows up around the 24th message.

The underlying error the comes up is always the same:

---8<[snip]---
 *** I received: This is message 22
 ??? read_array=[9, 7] write_array=[9, 7]
 +++ fd=9 : rarray=[]
 +++ fd=7 : rarray=[#<IO:fd 9>]
 +++ fd=9 : warray=[]
 +++ fd=7 : warray=[#<IO:fd 9>]
 ### capacity=16384 pending=0
 ??? read_array=[9, 7, 12] write_array=[9, 7, 12]
 +++ fd=9 : rarray=[]
 +++ fd=7 : rarray=[#<IO:fd 9>]
 +++ fd=12 : rarray=[#<IO:fd 9>, #<IO:fd 7>]
 +++ fd=9 : warray=[]
 +++ fd=7 : warray=[#<IO:fd 9>]
 +++ fd=12 : warray=[#<IO:fd 9>, #<IO:fd 7>]
 ### capacity=16384 pending=0
 ??? read_array=[9, 7, 12] write_array=[9, 7, 12]
 +++ fd=9 : rarray=[]
 +++ fd=7 : rarray=[#<IO:fd 9>]
 +++ fd=12 : rarray=[#<IO:fd 9>, #<IO:fd 7>]
 +++ fd=9 : warray=[]
 +++ fd=7 : warray=[#<IO:fd 9>]
 +++ fd=12 : warray=[#<IO:fd 9>, #<IO:fd 7>]
recv: Bad file descriptor
[0x7f88b80700c0]:ERROR[-2] AMQP header mismatch: '' (connection aborted)

CONNECTION ERROR connection aborted (remote)
 !!! deleting fd=12
 ??? read_array=[9, 7] write_array=[9, 7]
 +++ fd=9 : rarray=[]
/home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:80:in
`initialize': Bad file descriptor (Errno::EBADF)
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:80:in
`new'
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:80:in
`block (3 levels) in start_event_monitor'
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:78:in
`each'
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:78:in
`block (2 levels) in start_event_monitor'
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:39:in
`loop'
	from /home/mcpierce/Programming/eventful-qpid-proton/lib/eventful-qpid-proton/event_machine.rb:39:in
`block in start_event_monitor'
ruby-mri:
/home/mcpierce/Programming/Proton/proton-c/src/object/object.c:99:
pn_free: Assertion `pn_refcount(object) == 1' failed.
Aborted
---8<[snip]---

At the point where the error occurs, Ruby is attempting to wrap the
fileno returned by the Selectable in an IO object. In this case it is
almost always the number 9 that's coming up.

Anybody see anything related to this before?

[1] https://github.com/mcpierce/eventful-qpid-proton

-- 
Darryl L. Pierce, Sr. Software Engineer @ Red Hat, Inc.
Delivering value year after year.
Red Hat ranks #1 in value among software vendors.
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