[llvm-bugs] [Bug 39576] New: [llvm-exegesis] segfault in llvm-exegesis

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39576

            Bug ID: 39576
           Summary: [llvm-exegesis] segfault in llvm-exegesis
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-exegesis
          Assignee: unassignedbugs at nondot.org
          Reporter: schuett at gmail.com
                CC: clement.courbet at gmail.com, gchatelet at google.com,
                    llvm-bugs at lists.llvm.org

Hi,

when running:
./llvm-exegesis -mode=latency -opcode-name=ADD64rr
I get a segfault. This seems to be independent of the arguments and I have been
running into this problem for a while now.

#0  0x00007ffff6c76d60 in std::string::data() const () from
/lib64/libstdc++.so.6
#1  0x000000000095f568 in StringRef (Str=<error reading variable: Cannot access
memory at address 0x1e0>, this=<optimized out>)
    at /local/FOO/llvm/include/llvm/ADT/StringRef.h:96
#2  llvm::TargetMachine::getTargetCPU (this=0x0) at
/local/FOO/llvm/include/llvm/Target/TargetMachine.h:106
#3  0x000000000097ce2a in
llvm::exegesis::ExecutableFunction::ExecutableFunction(std::unique_ptr<llvm::LLVMTargetMachine,
std::default_delete<llvm::LLVMTargetMachine> >,
llvm::object::OwningBinary<llvm::object::ObjectFile>&&) (this=0x7fffffffdaf0,
TM=
    std::unique_ptr<llvm::LLVMTargetMachine> containing 0x7fffffffdc40,
    ObjectFileHolder=<unknown type in /local/FOO/clang/bin/llvm-exegesis, CU
0x466f33f, DIE 0x4778b6c>)
    at /local/FOO/llvm/tools/llvm-exegesis/lib/Assembler.cpp:282
#4  0x000000000095ec01 in llvm::exegesis::BenchmarkRunner::runConfiguration
(this=0x36d4a80, BC=..., NumRepetitions=10000)
    at /local/FOO/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp:126
#5  0x0000000000410c95 in llvm::exegesis::benchmarkMain () at
/local/FOO/llvm/tools/llvm-exegesis/llvm-exegesis.cpp:374
#6  0x0000000000411247 in main (Argc=3, Argv=0x7fffffffe148) at
/local/FOO/llvm/tools/llvm-exegesis/llvm-exegesis.cpp:455

This is a skylake server with CentOS 7.5. LLVM is a trunk build with debug.

Please let me now, if I you want me to provide more information.

Thanks,
  Thorsten

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