Ken Giusti commented on PROTON-255:

Pushed the workaround for now - harmless and prevents the stall.


Leaving bug open in lieu of better fix.
> Messenger stall in send(): frames buffered in transport not written to driver.
> ------------------------------------------------------------------------------
>                 Key: PROTON-255
>                 URL: https://issues.apache.org/jira/browse/PROTON-255
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.4
>            Reporter: Ken Giusti
>            Priority: Blocker
> I've created a simple "ping-pong" test between two Messenger clients.  One 
> client sends 10k messages to the other, which replies.  The test stalls after 
> sending 10 messages in each direction, which is the value used for link 
> credit.
> The cause of the problem is that the FLOW frame sent by one client is not be 
> received by the other.  The failure is due to the FLOW frame remaining 
> buffered in the sender's transport buffer, not being written to the driver.  
> The driver is waiting for socket activity, and never "sees" the pending 
> output sitting in the transport.
> This bug appears to have been introduced by PROTON-225

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