docs: Add Troubleshooting page

Original source:
https://github.com/JonathonReinhart/staticx/wiki/Troubleshooting

docs/index.rst

@@ -11,4 +11,5 @@ anywhere, just like a static executable.
    introduction
    installation
    usage
+   troubleshooting
    changelog

docs/troubleshooting.rst

@@ -0,0 +1,45 @@
+Troubleshooting
+===============
+
+StaticX has to do some weird things in order to work. Thus, you might run into
+trouble.
+
+Run-time problems
+-----------------
+If, after bundling an application using StaticX, the resulting executable is
+crashing due to symbol issues or segfaults:
+
+Debug build
+~~~~~~~~~~~
+The first step is to use the ``--debug`` flag when bundling::
+
+    $ staticx --debug myprog myprog.sx
+
+This option will:
+
+- Set loglevel to ``DEBUG`` while building the program
+- Use a debug variant of the bootloader which:
+
+    - Adds debug output (to stderr)
+    - Includes DWARF debug info
+
+.. note::
+
+    Please include all debugging information if you open an issue.
+
+
+GDB
+~~~
+If your program segfaults, you can run it under GDB.
+
+Before giving the ``r`` command to run your program, use
+``set follow-fork-mode child`` so GDB
+`follows the child process <https://sourceware.org/gdb/onlinedocs/gdb/Forks.html>`_.
+
+To get a backtrace::
+
+    $ gdb --args ./myprog.sx
+    set follow-fork-mode child
+    r
+    (segfault)
+    bt -full