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

Bill York Bill.York at mathworks.com
Fri Oct 12 11:18:14 UTC 2018

Excellent. That looks like the same bug. Note that it also affects JDK8.


On 10/11/18, 5:43 PM, "Sergey Bylokhov" <Sergey.Bylokhov at oracle.com> wrote:

    Hi, Bill.
    The similar bug was reported recently:
    The root cause is how we use CoreGraphics display ID. This identifier can become non-valid at any time therefore methods, which is using this id should be ready to it.
    And this bug found a few places which does not take care about the rule above.
    I am working on the fix for jdk12.
    On 10/10/2018 08:45, Bill York wrote:
    > 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:
    > http://cr.openjdk.java.net/~serb/8000629/webrev.08/src/macosx/native/sun/awt/CGraphicsDevice.m.html
    > 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.
    > Bill
    Best regards, Sergey.

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