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2018-06-28T18:40:57Z

1版をインポートしました

wiki>Mont29: adding tip about avoiding dealocks when debuging under linux with AMD gc

2012-05-30T14:01:22Z

adding tip about avoiding dealocks when debuging under linux with AMD gc

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= Debugging with GDB =

There are a couple ways to go about debugging crashes in Blender. Today I had to learn one of them. The steps are pretty easy to follow. These instructions '''should''' work for any platform with Bash and GDB, typically Unix system or with MinGW/Cygwin Windows.

=== Compile Debug Build ===

How to make a debug build depends on the build system used:

* For Scons, set BF_DEBUG=True in user-config.py
* For CMake, set CMAKE_BUILD_TYPE=Debug
* In Visual Studio, set the Release Configuration to Debug

=== Run GDB ===

Start GDB by changing the working directory to the location of your new debug build and typing one of the following, depending on the platform:
<source lang="bash">
gdb blender.exe
</source>
<source lang="bash">
gdb ./blender
</source>

Then to start Blender, type:
<source lang="bash">
run
</source>
Now make Blender crash. Blender will freeze, so switch to the GDB prompt. Get a backtrace by typing:
<source lang="bash">
bt
</source>
A more complete backtrace can be printed using:
<source lang="bash">
thread apply all bt full
</source>

For more information, see this guide: [http://wiki.debian.org/HowToGetABacktrace How to Get a Backtrace].

{{NiceTip|Happy AMD graphic card owners|If you are using proprietary AMD drivers under Linux (fglrx), '''before doing any debugging''', run (in a root terminal) :
<source lang=bash>
# aticonfig --sb off
</source>
And reboot your PC (you can also, if you prefer, directly edit your xorg.conf file, and add, in the Device section, the line <code>Option "BlockSignalsOnLock" "off"</code>)

Else, you may get some (really unfriendly) random freezes, deadlocks, as fglrx blocks signals in certain situations, and gdb waits for those signals…}}

=== Copy Crash Information ===

If you would like to make this information available to a developer you can copy and paste it from the command prompt.

On Windows, selecting and copying text from the command prompt works different than you might expect: by right clicking on the windows header, select Edit > Mark from the menu. Then highlight your selection. Then again right click on the header and select Edit > Copy.

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wiki>Mont29: adding tip about avoiding dealocks when debuging under linux with AMD gc

Yamyam: 1版をインポートしました