[iOS] REGRESSION(r250151): Occasional assertion failures in ShareableBitmap::~ShareableBitmap()

[David Quesada]

CGImageRef's created from a ShareableBitmap can legitimately be deallocated on a background thread. When this happens, the data provider's release callback will be called. This derefs the ShareableBitmap, which might cause it to deallocate, isn't allowed on the background thread. releaseDataProviderData() should dispatch to the main runloop if it is called from a background thread. This is similar to what r250151 added for releaseBitmapContextData().

[David Quesada]

rdar://problem/55624598

[David Quesada]

Created attachment 379379 [details]
Patch

[Chris Dumez]

Comment on attachment 379379 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=379379&action=review

> Source/WebKit/Shared/cg/ShareableBitmapCG.cpp:159
> +    if (!RunLoop::isMain()) {

This looks a lot like https://trac.webkit.org/changeset/250151 ?

[Chris Dumez]

Comment on attachment 379379 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=379379&action=review

>> Source/WebKit/Shared/cg/ShareableBitmapCG.cpp:159
>> +    if (!RunLoop::isMain()) {
> 
> This looks a lot like https://trac.webkit.org/changeset/250151 ?

Oh, it is a different release function :)

[WebKit Commit Bot]

Comment on attachment 379379 [details]
Patch

Clearing flags on attachment: 379379

Committed r250248: <https://trac.webkit.org/changeset/250248>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.