[llvm-bugs] [Bug 42895] New: Segfault on `p $0`

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42895

            Bug ID: 42895
           Summary: Segfault on `p $0`
           Product: lldb
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: whitequark at whitequark.org
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

Created attachment 22342
  --> https://bugs.llvm.org/attachment.cgi?id=22342&action=edit
Communication with GDB stub

I am using LLDB 8 from Debian. To reproduce:

(lldb) gdb-remote 1234
Process 1 stopped
* thread #1, stop reason = signal SIGTRAP
    frame #0: 0xffffffffffffffff
(lldb) p $0
(lldb) p $0

Thread 1 "lldb-8" received signal SIGSEGV, Segmentation fault.
EvaluateExpression () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Target/Target.cpp:2389
2389    /build/llvm-toolchain-8-8.0.1/tools/lldb/source/Target/Target.cpp: No
such file or directory.
(gdb) bt
#0  EvaluateExpression () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Target/Target.cpp:2389
#1  0x00007ffff2bcc196 in EvaluateExpression () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Commands/CommandObjectExpression.cpp:441
#2  0x00007ffff2bcd0e8 in DoExecute () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Commands/CommandObjectExpression.cpp:658
#3  0x00007ffff277692f in Execute () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Interpreter/CommandObject.cpp:997
#4  0x00007ffff276ddf2 in HandleCommand () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Interpreter/CommandInterpreter.cpp:1761
#5  0x00007ffff2771531 in IOHandlerInputComplete () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2801
#6  0x00007ffff26c63e1 in Run () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Core/IOHandler.cpp:558
#7  0x00007ffff26abb86 in ExecuteIOHandlers () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Core/Debugger.cpp:988
#8  0x00007ffff2772376 in RunCommandInterpreter () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/Interpreter/CommandInterpreter.cpp:3003
#9  0x00007ffff2561121 in RunCommandInterpreter () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/source/API/SBDebugger.cpp:934
#10 0x0000000000407131 in MainLoop () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/tools/driver/Driver.cpp:756
#11 0x0000000000407d51 in main () at
/build/llvm-toolchain-8-8.0.1/tools/lldb/tools/driver/Driver.cpp:936

Communication with GDB stub is attached.

This is a MIPS target and I was trying to get the value of register $0.

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