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https://issues.apache.org/jira/browse/AXIS2C-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Lazarski resolved AXIS2C-1584.
-------------------------------------
Resolution: Fixed
Add reference counting to axis2_callback to prevent use-after-free and
memory leaks in async non-blocking operations. The callback is shared
between the main thread and worker thread, requiring proper lifecycle
management.
Changes:
- Add ref counter to axis2_callback struct, initialized to 1
- Add axis2_callback_increment_ref() for thread-safe ref increment
- Modify axis2_callback_free() to decrement ref and only free at zero
- Update op_client worker thread to properly manage callback refs
- Update svc_client async operations to balance ref counts
- Handle NULL response in worker thread with error callback
- Add error checking for axis2_engine_send()
> Asynchronous call crashes and memory leaks
> ------------------------------------------
>
> Key: AXIS2C-1584
> URL: https://issues.apache.org/jira/browse/AXIS2C-1584
> Project: Axis2-C
> Issue Type: Bug
> Components: core/clientapi
> Affects Versions: 1.6.0
> Environment: Ubuntu Linux
> Reporter: Alex Mantaut
> Priority: Blocker
> Labels: asynchronous, memory_leak, non-blocking, patch
> Fix For: 2.0.0
>
> Attachments: axis_async.patch, calculatorFinal.tar.gz,
> echo_non_blocking_tester.zip
>
>
> 1. Fix crash when a non-blocking call results in a timeout.
> 2. Implements an incremental ref system on callbacks to avoid a big memory
> leak.
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