JazzJackrabbit Community Forums - Bug Report Using the jjLAYER constructor to copy eventually causes access violation in Rivellon

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- - Bug Report Using the jjLAYER constructor to copy eventually causes access violation in Rivellon (http://www.jazz2online.com/jcf/showthread.php?t=20792)

froducish

Jun 12, 2025 05:31 AM

Using the jjLAYER constructor to copy eventually causes access violation in Rivellon

Make a mutator just with this snippet:

Code:

array layerOrderings;

void onLevelBegin() {

        layerOrderings = jjLayerOrderGet();

        for (uint i = 0; i < layerOrderings.length(); i++) {

                jjLAYER@ copy = jjLAYER(layerOrderings[i]);

        }

}

Cycle to ezrivellon.j2l (https://www.jazz2online.com/downloads/9443/rivellon/) with the mutator on several times until access violation occurs. Seems to happen at the same instruction address each time it happens: https://i.imgur.com/UHq6Brf.png

Tested with JJ2+ v6.0a in Windows 10.

Violet CLM

Jun 14, 2025 06:28 PM

I haven't had any time to look into this yet (and I'm guessing the true is same for everyone else), but this is a good report, crashing at the same address can't be too hard to track down probably, thank you.

Violet CLM

Jun 17, 2025 10:42 AM

Okay! It looks like the jjLAYER copy constructor was confusing widthReal and widthRounded, trying to read unrelated memory. The extra memory it read never got used for anything, so there was no way to observe the issue except for this apparently very occasional crash. Fixed in 6.0b.

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