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61 lines
1.6 KiB
61 lines
1.6 KiB
6 years ago
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/*
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* This document explain how to run analyse the virglrenderer
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* code base using ASAN, the address sanitizer tools include
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* in Clang and gcc.
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*/
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VIRGLRENDERER:
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Compiling virglrenderer with the following flags:
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`-fsanitize=address`
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or
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`-fsanitize=memory`
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Sadly, we can't use both of them in the same time.
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For example,
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```
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export CFLAGS="-fsanitize=address -fno-omit-frame-pointer"
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export CXXFLAGS="-fsanitize=address -fno-omit-frame-pointer"
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mkdir build && cd build
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../autogen.sh --prefix=/home/user/virglrenderer/install --enable-debug
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make
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```
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The `-fsanitize=leak` flag don't have to be add for Linux as
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it is set by default. This flag can be add to the toolchain of other platform.
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MESA:
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Since mesa unloads the drivers before a program finished, but ASAN only
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resolves stack traces at the end. It is almost impossible to get meaningful
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backtraces and so check whether the culprit is mesa or virglrenderer.
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Hence, it is useful to override *dlclose* by pre-loading a shared library
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that implements a stub, e.g. like:
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```
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int dlclose(void *handle) {
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return 0;
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}
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```
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It seems that you need to pre-load ASAN before your dummie library.
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`export LD_PRELOAD="/usr/lib64/gcc/x86_64-pc-linux-gnu/7.3.0/libasan.so $HOME/libfake-dlclose.so"`
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VTEST:
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Then run virglrenderer with the following flag:
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`ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer`
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On platform other than Linux, `ASAN_OPTIONS=detect_leaks=1`
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should be added.
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Start the vtest server with the command:
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`ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer ./virgl_test_server`
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Then connect to the server
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```
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export LIBGL_ALWAYS_SOFTWARE=true
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export GALLIUM_DRIVER=virpipe
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```
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Run any payload.
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