Error: Failed to find a python interpreter in the .data section

[mottosso]

Hi @benfred,

Loving the goals for this project, but understand it's a little early.

Running this on Windows 10, Python 3.6 x64, profiling another instance of the same version I get this.

$ pip install py-spy
$ c:\Python36\scripts\py-spy --pid 4024
Error: Failed to find a python interpreter in the .data section

Likely a separate problem, but profiling a Python 2.7 x64 instance yields this.

$ c:\Python36\scripts\py-spy --pid 1140
Error: Unsupported version of Python: 2.2.2

The Python instances were merely started, with nothing much going on.

$ c:\Python36\python.exe
Python 3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 18:41:36) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

$ c:\Python27\python.exe
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

Any way I can work around this?

[benfred]

Thanks for the bug report! This is really helpful.

It seems like you found two different problems:

1. The first problem was pulling out the wrong version of python (2.2.2). I’m scanning the BSS section for the sys.version variable - and in your case there was another semver string included that was getting picked up (was finding this string here instead: https://github.com/python/cpython/blob/master/Modules/_sre.c#L39, so was thinking you had a v2.2 python install =(. I’ve fixed here to match more tightly 00ec463 - if you pull the most recent code and build it it should work now.

2. The second problem is a bit trickier - On windows right now we need the symbol files for python, and it seems like it failed to load some of the symbols we need =( Symbols should be installed with python3.6 though - what are the contents of your c:\python36 directory? The symbol files ’python36.pdb’ and ‘python.pdb’ should be there. For python2.7 the symbol files aren’t installed with the installer from python.org (though they are installed with anaconda), however you can download the python2.7 symbols here .

Also If you see the symbol files for python36 and it still doesn’t work, can you try enabling logging and rerunning?

set RUST_LOG=info
py-spy —pid pid

I’m hoping to fix the code to not require symbol files on windows pretty soon - the OSX and Linux versions both work without symbols, and it shouldn’t be too hard to get this going for windows.

This library is still super early in development - I’ve only really put it up here to get some early feedback (and haven’t posted it anywhere public yet =). I’m still working through some of the issues, but I am hoping to have it ready for wider release in the next week or so.

Thanks again, and let me know if you find any other issues!

[benfred]

The fix for working without symbols on windows turned out to be pretty easy actually: 6809f59 . I'm hoping this last commit will fix the issues you were seeing

[mottosso]

Thanks for the quick reply, and fix! Giving this a try next.

and haven’t posted it anywhere public yet =)

I came across the project on DuckDuckGo, searching for "sampling profiler python"; yours was the first result. :)

[benfred]

I think it's ready for general use now - I've fixed this issue (and a bunch of others with the system python on OSX, homebrew installs etc). Thanks for giving this a go!

[mottosso]

It works! :)