[llvm] r297971 - Salvage debug info from instructions about to be deleted

[Yung, Douglas via llvm-commits]

Our internal bot also hit something around this change, I suspect it is the same thing, I'm trying to get a reproducible. FWIW, here is the console output from the failed build:

FAILED: cd /home/siadmin/jenkins/w/opensource/opensource_build/build/projects/compiler-rt/lib/tsan/tests/unit && /home/siadmin/jenkins/w/opensource/opensource_build/build/./bin/clang -fPIC -fvisibility-inlines-hidden -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -ffunction-sections -fdata-sections -Wall -std=c++11 -Wno-unused-parameter -Wno-unknown-warning-option -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fno-stack-protector -fvisibility=hidden -fvisibility-inlines-hidden -fno-lto -O3 -g -Wno-variadic-macros -Wno-non-virtual-dtor -fPIE -fno-rtti -DGTEST_NO_LLVM_RAW_OSTREAM=1 -DGTEST_HAS_RTTI=0 -I/home/siadmin/jenkins/w/opensource/opensource_build/llvm/utils/unittest/googletest/include -I/home/siadmin/jenkins/w/opensource/opensource_build/llvm/utils/unittest/googletest -I/home/siadmin/jenkins/w/opensource/opensource_build/llvm/projects/compiler-rt/lib -I/home/siadmin/jenkins/w/opensource/opensource_build/llvm/projects/compiler-rt/lib/tsan/rtl -DGTEST_HAS_RTTI=0 -m64 -c -o tsan_sync_test.cc.x86_64.o /home/siadmin/jenkins/w/opensource/opensource_build/llvm/projects/compiler-rt/lib/tsan/tests/unit/tsan_sync_test.cc
clang-5.0: error: unable to execute command: Killed
clang-5.0: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 5.0.0 
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/siadmin/jenkins/w/opensource/opensource_build/build/./bin
clang-5.0: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
clang-5.0: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-5.0: note: diagnostic msg: /tmp/tsan_sync_test-8d36d1.cpp
clang-5.0: note: diagnostic msg: /tmp/tsan_sync_test-8d36d1.sh
clang-5.0: note: diagnostic msg: 

********************

Sadly I don't have access to the failure preprocessed source or script that was generated, so I'm trying to reproduce it on my machine which might take longer since it is slower...

Douglas Yung

> -----Original Message-----
> From: llvm-commits [mailto:llvm-commits-bounces at lists.llvm.org] On Behalf Of
> Adrian Prantl via llvm-commits
> Sent: Thursday, March 16, 2017 13:16
> To: Evgenii Stepanov
> Cc: LLVM Commits
> Subject: Re: [llvm] r297971 - Salvage debug info from instructions about to be
> deleted
> 
> Is there a bot that catches this or otherwise any instructions to reproduce
> this?
> 
> thanks,
> adrian
> 
> > On Mar 16, 2017, at 1:13 PM, Evgenii Stepanov <eugeni.stepanov at gmail.com>
> wrote:
> >
> > Hi,
> >
> > ninja check-msan on linux/x86_64 has started using unlimited memory
> > and I suspect this change.
> > One common allocation is
> >
> > #9 0x00007f40f6cfae0d operator new(unsigned long)
> > /build/gcc-4.8-mW1ufQ/gcc-4.8-4.8.4/build/x86_64-linux-gnu/libstdc++-v
> > 3/libsupc++/../../../../src/libstdc++-v3/libsupc++/new_op.cc:56:0
> > #10 0x00000000017e3a8d llvm::DIExpression::getImpl(llvm::LLVMContext&,
> > llvm::ArrayRef<unsigned long>, llvm::Metadata::StorageType, bool)
> > (/code/build-llvm/bin/clang-5.0+0x17e3a8d)
> > #11 0x0000000001dae195 prependDIExpr(llvm::DIBuilder&,
> > llvm::DIExpression*, bool, long)
> > (/code/build-llvm/bin/clang-5.0+0x1dae195)
> > #12 0x0000000001db539b std::_Function_handler<void
> > (llvm::DbgValueInst&),
> > llvm::salvageDebugInfo(llvm::Instruction&)::$_2>::_M_invoke(std::_Any_
> > data
> > const&, llvm::DbgValueInst&)
> > (/code/build-llvm/bin/clang-5.0+0x1db539b)
> > #13 0x0000000001dade35 llvm::findDbgValues(llvm::Value*,
> > std::function<void (llvm::DbgValueInst&)>)
> > (/code/build-llvm/bin/clang-5.0+0x1dade35)
> > #14 0x0000000001dae7f6 llvm::salvageDebugInfo(llvm::Instruction&)
> > (/code/build-llvm/bin/clang-5.0+0x1dae7f6)
> > #15 0x0000000001961964
> > llvm::InstCombiner::eraseInstFromFunction(llvm::Instruction&)
> > (/code/build-llvm/bin/clang-5.0+0x1961964)
> > #16 0x000000000196deb5 llvm::InstCombiner::run()
> > (/code/build-llvm/bin/clang-5.0+0x196deb5)
> >
> >
> 
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