Alex Rudyy created QPID-8057:
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Summary: [JMS AMQP 0-x][AMQP 0-10] IoReceiver thread can block
itself for 60 seconds after sending session close controls and waiting for
broker responses
Key: QPID-8057
URL: https://issues.apache.org/jira/browse/QPID-8057
Project: Qpid
Issue Type: Bug
Components: JMS AMQP 0-x
Affects Versions: qpid-java-6.1.5, qpid-java-client-0-x-6.3.0,
qpid-java-6.0.8
Reporter: Alex Rudyy
IoReceiver thread can "dead lock" itself for 60 seconds after receiving
execution exception from broker and sending session controls to close other
connection sessions. This issue can occur in the following scenario:
* broker sends execution exception
* client receives execution exception and populates field
{{org.apache.qpid.client.AMQSession_0_10#_currentException}} as part of
{{org.apache.qpid.client.AMQSession_0_10#setCurrentException}}. The field is
set using synchronization lock
{{org.apache.qpid.client.AMQSession_0_10#_currentExceptionLock}}. However, the
field is referenced later in
{{org.apache.qpid.client.AMQSession_0_10#setCurrentException}} without the
synchronization lock. It could reset (set to null) from the application main
thread as part of call {{org.apache.qpid.client.AMQSession#checkNotClosed}}
whilst the execution of
{{org.apache.qpid.client.AMQSession_0_10#setCurrentException}} is still in
progress. As result,
{{org.apache.qpid.client.AMQSession_0_10#_currentException}} can have null
value when metho {{org.apache.qpid.client.AMQConnection#exceptionReceived}} is
invoked from {{org.apache.qpid.client.AMQSession_0_10#setCurrentException}}.
{{null}} cause is interpreted as 'hard error' causing to close other sessions
and connection from IoReceiver thread. Whilst closing session or connection the
client waits for the broker responses, however, it cannot get them as
IoReceiver thread is blocked. Wen should not wait for any broker responses in
IoReceiver thread.
Thus, we have 2 issues here:
* {{org.apache.qpid.client.AMQSession_0_10#_currentException}} should not be
referenced without a synchronization lock
* the client should not wait for broker responses in IoReceiver thread (i.e.
session or connection close should not be performed in IoReceiver thread)
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