[llvm-dev] Building/Running LLVM Tests with Sanitizers

[Peter Smith via llvm-dev]

Hello Dean,

I've not done this myself for a while, I seem to remember it taking a
while to get right. When I did I found the page:
https://github.com/google/sanitizers/wiki/MemorySanitizerBootstrappingClang
useful. The other thing that might work is following the individual
cmake steps from
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan
. These aren't in the same structure as the monorepo but they may be
adaptable.

My apologies if you've tried these already.

Peter

On 30 August 2018 at 12:42, Dean Michael Berris via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Hi llvm-dev,
>
> I'm trying to reproduce an msan failure in one of the bots, but I
> can't seem to get the right incantation of building LLVM with msan.
> Here's what I've been doing:
>
> 1) Build the toolchain in one build directory, including `compiler-rt`.
>
> 2) Build the toolchain again with the just built toolchain in step 1,
> but this time with `-DLLVM_USE_SANITIZER=MemoryWithOrigins`.
>
> I get some msan errors, but of this kind instead of the one I'm expecting:
>
> ====
> $ ./unittests/XRay/XRayTests
> ==236769==WARNING: MemorySanitizer: use-of-uninitialized-value
>     #0 0x70eef8
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x70eef8)
>     #1 0x70d2dc
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x70d2dc)
>     #2 0x721044
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x721044)
>     #3 0x6e2a37
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x6e2a37)
>     #4 0x3722aa
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x3722aa)
>     #5 0x372868
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x372868)
>     #6 0x775a4c
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x775a4c)
>     #7 0x7f85b6c7e23f  (/lib/x86_64-linux-gnu/libc.so.6+0x2023f)
>     #8 0x2f4029
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x2f4029)
>
>   Uninitialized value was created by an allocation of 'ref.tmp' in the
> stack frame of function
> '_ZN7testing8internal12UnitTestImpl11AddTestInfoEPFvvES3_PNS_8TestInfoE'
>     #0 0x720f10
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x720f10)
>
> SUMMARY: MemorySanitizer: use-of-uninitialized-value
> (/usr/local/google/home/dberris/xray/llvm-project-build-msan/unittests/XRay/XRayTests+0x70eef8)
> Exiting
>
> ====
>
> Is there something else I'm missing here? I'm doing this on Linux. I
> tried building with libc++ from the first toolchain, but somehow the
> linker from the same toolchain in step 1 couldn't find the libc++ with
> msan instrumentation.
>
> Here's the CMake command I'm using:
>
> ====
> cmake -GNinja -DCMAKE_C_COMPILER=$HOME/xray/llvm-project-build/bin/clang
> -DCMAKE_CXX_COMPILER=$HOME/xray/llvm-project-build/bin/clang++
> -DCMAKE_BUILD_TYPE=Debug -DLLVM_OPTIMIZED_TABLEGEN=On
> -DLLVM_ENABLE_ASSERTIONS=On -DLLVM_USE_SANITIZER=MemoryWithOrigins
> -DLLVM_ENABLE_LLD=On -DLLVM_INCLUDE_TESTS=On
> -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DCMAKE_LINK_FLAGS=-stdlib=libc++
> ../llvm-project/llvm
> ====
>
> And I'm running the tests like so:
>
> ====
> ninja check-llvm
> ====
>
> I'm doing this with the monorepo, if that's relevant.
>
> Help?
>
> --
> Dean
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