Yesterday I was able to reproduce and fix a bug that several people reported against X-Plane 10.10; the bug is random, which explains why, when I tried to follow their reproduction steps, I did not get the same results.  The last step in the bug report could have been “get lucky”.

The bug is: on Windows, sometimes the sim would output a ton of LOD warnings for objects (including default objects that ship with the sim) and then framerate would be reduced.  Running a heavy framerate test on my PC I saw fps reduced from 25 to 15 fps when the failure happened.

The bug was 8bytes of uninitialized data deep in the OBJ engine; the impact depended on the random contents.

I will cut X-Plane 10.11r3 soon with a fix to this.

Reminder: please do not post bug reports to the comment section.  This includes reports of “I saw this bug too or “I saw this, but on OS X” or “it works fine for me” or “why haven’t you guys fixed XXX.”  Please report bugs via the bug reporter.

About Ben Supnik

Ben is a software engineer who works on X-Plane; he spends most of his days drinking coffee and swearing at the computer -- sometimes at the same time.

6 comments on “Random Warning and Framerate Fail

  1. Hey, nice work!
    I’ve never stumbled across it though, but nice to know another bug got squashed!
    Thanks

  2. At least it was a dumb bug and not one of those smart ones that goes into hiding when it realizes you are hunting it. 🙂

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