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This is the case:
```
pwndbg> show print elements
Limit on string chars or array elements to print is 200.
warning: (Internal error: pc 0x7ffff49ef495 in read in CU, but not in symtab.)
warning: (Internal error: pc 0x7ffff49ef495 in read in CU, but not in symtab.)
warning: (Internal error: pc 0x7ffff49ef495 in read in CU, but not in symtab.)
warning: (Internal error: pc 0x7ffff49ef495 in read in CU, but not in symtab.)
Exception occurred: Error: invalid literal for int() with base 10: 'symtab.)' (<class 'ValueError'>)
For more info invoke `set exception-verbose on` and rerun the command
or debug it by yourself with `set exception-debugger on`
Python Exception <class 'ValueError'> invalid literal for int() with base 10: 'symtab.)':
```

If we call `message = message.split()[-1]`, we get `symtab.)`.
Then `length = int(message)` raise an Exception.
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pwndbg license IRC

pwndbg (/poʊndbæg/) is a GDB plug-in that makes debugging with GDB suck less, with a focus on features needed by low-level software developers, hardware hackers, reverse-engineers and exploit developers.

It has a boatload of features, see FEATURES.md.

Why?

Vanilla GDB is terrible to use for reverse engineering and exploit development. Typing x/g30x $esp is not fun, and does not confer much information. The year is 2020 and GDB still lacks a hexdump command! GDB's syntax is arcane and difficult to approach. Windbg users are completely lost when they occasionally need to bump into GDB.

What?

Pwndbg is a Python module which is loaded directly into GDB, and provides a suite of utilities and crutches to hack around all of the cruft that is GDB and smooth out the rough edges.

Many other projects from the past (e.g., gdbinit, PEDA) and present (e.g. GEF) exist to fill some these gaps. Each provides an excellent experience and great features -- but they're difficult to extend (some are unmaintained, and all are a single 100KB, 200KB, or 300KB file (respectively)).

Pwndbg exists not only to replace all of its predecessors, but also to have a clean implementation that runs quickly and is resilient against all the weird corner cases that come up.

How?

Installation is straightforward. Pwndbg is best supported on Ubuntu 18.04 with GDB 7.11, and Ubuntu 20.04 with GDB 8.1.

git clone https://github.com/pwndbg/pwndbg
cd pwndbg
./setup.sh

Other Linux distributions are also supported via setup.sh, including:

  • Debian-based OSes (via apt-get)
  • Fedora and Red Hat (via dnf)
  • Clear (via swiped)
  • OpenSUSE LEAP (via zypper)
  • Arch and Manjaro (via community AUR packages)
  • Void (via xbps)
  • Gentoo (via emerge)

If you use any Linux distribution other than Ubuntu, we recommend using the latest available GDB built from source. Be sure to pass --with-python=/path/to/python to ./configure.

What can I do with that?

For further info about features/functionalities, see FEATURES.

Who?

Pwndbg is an open-source project, written and maintained by many contributors!

Want to help with development? Read CONTRIBUTING.

Contact

If you have any questions not worthy of a bug report, feel free to ping ebeip90 or disconnect3d at #pwndbg on Freenode and ask away. Click here to connect.