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

[Dean Michael Berris via llvm-dev]

Thanks Vitaly and Peter,

I went with a modified version of the instructions from https://github.com/google/sanitizers/wiki/MemorySanitizerBootstrappingClang — that’s a very helpful set of instructions!

Cheers

> On 31 Aug 2018, at 02:55, Vitaly Buka <vitalybuka at google.com> wrote:
> 
> Another option is just to run corresponding script from https://llvm.org/svn/llvm-project/zorg/trunk/zorg/buildbot/builders/sanitizers/ in empty directory.
> 
> On Thu, Aug 30, 2018 at 5:00 AM Peter Smith via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 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
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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-- Dean