[OpenJDK 2D-Dev] RFR [JDK15] : 8244818 : Java2D Queue Flusher crash while moving application window to external monitor

Kevin Rushforth kevin.rushforth at oracle.com
Fri Jun 19 22:32:38 UTC 2020

Looks good.


-- Kevin

On 6/19/2020 3:23 PM, Philip Race wrote:
> Bug : https://bugs.openjdk.java.net/browse/JDK-8244818
> Webrev : http://cr.openjdk.java.net/~prr/8244818/
> Please review this fix for JDK 15 :
> This crash was reported recently but we'd not been able to reproduce 
> it until we used Xcode 11.3 to build,
> in which case it became 100% reproducible.
> The call that causes the crash, setting a scratch surface as NSView on 
> the new current context,
> is believed to be violating threading rules as it is not being done on 
> the Appkit thread, hence the crash
> however it also appears to be completely unnecessary.
> Removing causes no problems that we can find. J2Demo, SwingSet, 
> multimon, all headful automated
> regression and JCK tests pass.  So the fix is just to remove the call.
> There's no regression test since you need a multi-mon setup to see the 
> crash and we've not seen
> any other scenario causing a crash - dragging between monitors is the 
> main reason this code gets entered.
> I've seen it called when a new window or dialog is displayed but that 
> doesn't cause a crash and
> we have plenty of tests that open windows anyway :-)
> -phil.

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