https://bugs.freedesktop.org/show_bug.cgi?id=65968
Priority: medium Bug ID: 65968 Assignee: dri-devel@lists.freedesktop.org Summary: Massive memory corruption in Planetary Annihilation Alpha Severity: normal Classification: Unclassified OS: Linux (All) Reporter: andreas.ringlstetter@gmail.com Hardware: x86-64 (AMD64) Status: NEW Version: git Component: Drivers/DRI/r300 Product: Mesa
Created attachment 81105 --> https://bugs.freedesktop.org/attachment.cgi?id=81105&action=edit Example of corruption in PA. The skybox texture has been completely overwritten, partly with textures from other programms, corruption in other textures is already starting.
Using the R300 driver (git version from 2013-06-19) on a Mobility Radeon X1400 (128MB dedicated ???), I get massive memory corruption which can be seen in the attached screenshot when running the Planetary Annihilation Alpha.
The game makes use of virtual texturing, thats means a mega texture which won't possibly fit in the RAM in one piece.
However, it appears like textures which are NOT part of the mega texture have been mapped into the same address space. I could see other textures, and even bitmaps from other applications.
In the screenshot, there are large grey stripes for example, however there is no such texture in the game. The color does match the color of the window border though. Performing further tests, I even managed to get parts of album covers from Banshee into PA.
This issue is not only limited to Planetary Annihilation though and the corruption also works other way around, where applications overwrite the bitmaps of other applications.
The effects of the corruption are clearly visible in PA due to the large textures. They are not deterministic, but appear very reliable, most likely due to the high memory usage.
Using other applications which frequently allocate new textures (like Banshee with album covers) speeds up the corruption and makes it even visible in other applications like Firefox, Cinnamon etc., although not reliable.
Attached are: Screenshot of corruption Xorg-log glxinfo output