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UCEERR_CHANNELSYNCABANDONED
UCEERR_CHANNELSYNCABANDONED is a Windows User Composition Engine (UCE) HRESULT. It indicates that a synchronization request ended because the composition channel or its owning context was abandoned during the wait.
What to check for UCEERR_CHANNELSYNCABANDONED
- Check for window destruction, dispatcher shutdown, application exit, or render-thread termination.
- Stop waiting for the channel after teardown starts and cancel dependent work cleanly.
- Investigate any preceding render-thread failure because it can cause the channel to be abandoned.
Microsoft guidance for WPF render-thread failures
Diagnostic discriminator: Trace ownership and lifetime of the composition channel during the synchronization wait. This status means the wait was abandoned because the channel/context went away, not that synchronization merely timed out.
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