[lldb-dev] [Bug 51446] New: LLDB import std module tests crash with segmentation fault

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=51446

            Bug ID: 51446
           Summary: LLDB import std module tests crash with segmentation
                    fault
           Product: lldb
           Version: 12.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: omair.javaid at linaro.org
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

This came up during release testing on x86_64 and AArch64 but reproducible with
tot.

** Build instructions:

CC=/home/omair.javaid/work/lldb-dev/clang+llvm-11.0.1-aarch64-linux-gnu/bin/clang
CXX=/home/omair.javaid/work/lldb-dev/clang+llvm-11.0.1-aarch64-linux-gnu/bin/clang++

cmake -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DLLVM_ENABLE_PROJECTS="llvm;clang;clang-tools-extra;compiler-rt;libcxx;libcxxabi;libunwind;test-suite;openmp;lld;lldb;polly;mlir;flang"
\
-DLLVM_ENABLE_ASSERTIONS=OFF \
-DLLVM_LIT_ARGS=-svj4 \
-DCMAKE_C_COMPILER=$CC \
-DCMAKE_CXX_COMPILER=$CXX \
$LLDB_HOME/llvm-project/llvm

ninja

ninja check-lldb

** Failures:
  lldb-api ::
commands/expression/import-std-module/array/TestArrayFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/basic/TestImportStdModule.py
  lldb-api ::
commands/expression/import-std-module/conflicts/TestStdModuleWithConflicts.py
  lldb-api ::
commands/expression/import-std-module/deque-basic/TestDequeFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/deque-dbg-info-content/TestDbgInfoContentDequeFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/forward_list-dbg-info-content/TestDbgInfoContentForwardListFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/forward_list/TestForwardListFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/iterator/TestIteratorFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/list-dbg-info-content/TestDbgInfoContentListFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/list/TestListFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/non-module-type-separation/TestNonModuleTypeSeparation.py
  lldb-api ::
commands/expression/import-std-module/queue/TestQueueFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/retry-with-std-module/TestRetryWithStdModule.py
  lldb-api ::
commands/expression/import-std-module/shared_ptr-dbg-info-content/TestSharedPtrDbgInfoContentFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/shared_ptr/TestSharedPtrFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/sysroot/TestStdModuleSysroot.py
  lldb-api ::
commands/expression/import-std-module/vector-bool/TestVectorBoolFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/vector-dbg-info-content/TestDbgInfoContentVectorFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/vector-of-vectors/TestVectorOfVectorsFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/vector/TestVectorFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/weak_ptr-dbg-info-content/TestDbgInfoContentWeakPtrFromStdModule.py
  lldb-api ::
commands/expression/import-std-module/weak_ptr/TestWeakPtrFromStdModule.py


** Example Errors:

Fatal Python error: Segmentation fault

Thread 0x0000ffffa8055010 (most recent call first):
  File
"/home/omair.javaid/work/lldb-dev/build/release/aarch64/lib/python3/dist-packages/lldb/__init__.py",
line 6002 in EvaluateExpression
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py",
line 2586 in expect_expr
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/test/API/commands/expression/import-std-module/weak_ptr/TestWeakPtrFromStdModule.py",
line 28 in test
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py",
line 149 in wrapper
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py",
line 1834 in test_method
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/case.py",
line 413 in runMethod
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/case.py",
line 383 in run
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/case.py",
line 458 in __call__
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/suite.py",
line 117 in _wrapped_run
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/suite.py",
line 115 in _wrapped_run
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/suite.py",
line 85 in run
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/suite.py",
line 66 in __call__
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/third_party/Python/module/unittest2/unittest2/runner.py",
line 165 in run
  File
"/home/omair.javaid/work/lldb-dev/llvm-project/lldb/packages/Python/lldbsuite/test/dotest.py",
line 1017 in run_suite
  File "/home/omair.javaid/work/lldb-dev/llvm-project/lldb/test/API/dotest.py",
line 7 in <module>



** Further comments:

I did a bit of investigation and found that crash emerges from
clang/lib/Parse/ParseAST.cpp
in clang::ParseAST(Sema &S, bool PrintStats, bool SkipFunctionBodies) function.

Its called from
lldb/source/Plugin/ExpressionParser/Clang/ClangExpressionParser.cpp in function
ClangExpressionParser::ParseInternal at line no  1179  
ParseAST(m_compiler->getSema(), false, false);

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