[llvm-bugs] [Bug 36968] New: debugserver: Assertion Failed in GetRegisterContext

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https://bugs.llvm.org/show_bug.cgi?id=36968

            Bug ID: 36968
           Summary: debugserver: Assertion Failed in GetRegisterContext
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: alessandro.arzilli at gmail.com
                CC: llvm-bugs at lists.llvm.org

Hi,
I'm a maintainer of Delve [1] a debugger for the Go [2] programming language.
On macOS we are using debugserver as our backend and starting with a recent
update of the Command Line Tools our users are reporting a systematic crash of
debugserver [3][4], specifically:

Assertion failed: (bytes_written == size), function GetRegisterContext, file
/Library/Caches/com.apple.xbs/Sources/lldb/lldb-902.0.79.2/tools/debugserver/source/MacOSX/x86_64/DNBArchImplX86_64.cpp,
line 2689.

This happens in response to us sending the g command for the first time. To me
this sounds like a bug in debugserver.


 [1] http://github.com/derekparker/delve/
 [2] https://golang.org/
 [3] https://github.com/derekparker/delve/issues/1015#issuecomment-377595278
 [4] https://github.com/derekparker/delve/issues/1165

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