[OpenJDK 2D-Dev] Crash in CGraphicsDevice.m

Bill York Bill.York at mathworks.com
Wed Oct 10 15:45:09 UTC 2018

2d-dev folks,

I work on a product called MATLAB and we have about 60 reports from customers on Mac related to a crash in CGraphicsDevice.m

Please let  me know if this is the right way to report a crash and discuss getting it resolved.

Here are the details:

CGraphicsDevice.m is a native file in support of Java drawing and gets called from Java_sun_awt_CGraphicsDevice_nativeGetDisplayMode

While I can’t reproduce the problem, it looks like the display pointer is becoming invalid for a time when the user’s laptop opens or closes.

Looking at this source code:


I see a direct call to CFStringCompare without a check for a NULL CFStringRef.

  *   (CFStringCompare(mode, CFSTR(kIO30BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)

I believe if this code returned 0, the crash would not occur though there may be some other cleanup in the surrounding call frames.

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