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Proposing a debugging method for this bug

Hi Jerome

First, thank you for spending time working on the crash at VT switch on AMD64: fixing this bug is really important for the g-i project. I've just cloned your original BR as bug 396520 [1] to separate from the french keyboard issue, retitled it, assigned to the directfb package and merged with one by davide.
I've cc'ed d-boot this time, but feel free to drop them in future replies.
I've looked at you strace log and i think the best way to proceed is to check wether the crash can be reproduced or not also on a regular Debian system, where debugging is easier due to availability of gdb etc. So, i'm now asking you to install the libdirectfb-0.9-25 package on your regular debian system: this will allow you to run DFB applications from it (you'll need to enable framebuffer support at boot time by passing "video=vesa vga=788" to the kernel). Now, please compile and install Directfb examples [2] on your system and run each df_* application in turn. While an application is running, please switch to vt1 (ctrl-alt-f1) and then back to vt7 to see if you can crash your AMD64 system with a pure DirectFB (no gtk) application. In the case you should succeed in crashing the application and the console should become unresonding, you can connect from ssh and issue a "chvt 7" to get back to X.



[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=396520
[2] http://www.directfb.org/downloads/Extras/DirectFB-examples-0.9.25.tar.gz

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