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From: dieter <dieter@handshake.de>
Subject: Re: gdb unable to read python frame information
Date: Mon, 10 Mar 2014 08:13:42 +0100
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Wesley <nispray@gmail.com> writes:

> So, let me clarify here, in order to try, I get a clean machine.
>
> Centos 6.5 64bit.
> Now , I try this:
> 1. install gdb 7.7 from source , with configure option --with-python
>
> 2. install python 2.6.6 from source, with configure option --with-pydebug
>
> 3. run a python script
>
> 4. from command line, gdb python -p <pid> to attach the running script
>
> 5. within gdb, issue python, import libpython, end 
>   no errors
> 6. py-bt outputs nothing, py-locals says Unable to locate python frame
> here is the snippet:
> [root@localhost Python-2.6.6]# gdb python 52315
> GNU gdb (GDB) 7.7
> ....
> Attaching to program: /home/nipen/test/Python-2.6.6/python, process 52315
> Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> 0x00000030a98e15c3 in ?? ()
> (gdb) bt
> #0  0x00000030a98e15c3 in ?? ()
> #1  0x00007f4cf68d1219 in ?? ()
> #2  0x0000000000000000 in ?? ()

This looks like a very strange backtrace on C level as well.

The most natural explanation would be: your process is in a very strange
state (due to some C level problem). But, of course, your
"gdb" might have general problems, as well.