[Bug gas/26113] New: gas 2.34 gets stuck in infinite loop after compilation error

[me at tbrindus dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=26113

            Bug ID: 26113
           Summary: gas 2.34 gets stuck in infinite loop after compilation
                    error
           Product: binutils
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: me at tbrindus dot ca
  Target Milestone: ---

Created attachment 12622
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12622&action=edit
Python source code

Hi,

We run a system where students may submit code in several languages and have it
run on our machines -- among others, we support x64 Assembly and Python. One
student mis-selected the language of their source code, and submitted a Python
program as x64 Assembly. This caused gas 2.34 to lock up after emitting the
expected syntax errors; it did not terminate after 8 hours (when we found out
and SIGKILL'd the process).

We are running gas from Debian sid's repos. In particular:


    $ x86_64-linux-gnu-as --version
    GNU assembler (GNU Binutils for Debian) 2.34
    Copyright (C) 2020 Free Software Foundation, Inc.
    This program is free software; you may redistribute it under the terms of
    the GNU General Public License version 3 or later.
    This program has absolutely no warranty.
    This assembler was configured for a target of `x86_64-linux-gnu'.


The file submitted is attached. Running gas with no extra arguments exhibits
the issue.

    $ x86_64-linux-gnu-as test.py
    test.py: Assembler messages:
    test.py:1: Error: no such instruction: `def cal():'
    test.py:2: Error: junk at end of line, first unrecognized character is `('
    test.py:4: Error: invalid character '(' in mnemonic
    ...snip...
    test.py:17: Error: invalid character '(' in mnemonic
    test.py: Error: symbol definition loop encountered at `int'
    test.py: Error: invalid operands (.text and *ABS* sections) for `%' when
setting `a'

    ^C

This appears to be a regression since 2.31.1 (Debian buster version of gas),
which exits after emitting the error messages.

I'm happy to provide any other information that may be useful.

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