[Bug gdb/20604] New: Using quit() causes a infinity loop which and can not exit gdb

["davidrupprecht at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20604

            Bug ID: 20604
           Summary: Using quit() causes a infinity loop which and can not
                    exit gdb
           Product: gdb
           Version: 7.11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: davidrupprecht at gmail dot com
  Target Milestone: ---

Hi,

Instead of using just 'q' or 'quit', I often try to quit GDB using 'quit()'.
This causes the error "A syntax error in expression, near `)'.". However, after
this error I'm not able to type any command in gdb and gdb do not really
respond. gdb only responses to ctrl+c with "(gdb) Quit". Even ctrl+d does not
work. Various combination of 'quit' and '(' cause this error. I tested several
combinations like 'q (', 'q(', 'q)' and 'qui('. However, 'qu (' works fine.

I'm using:
- 'GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1.'
- 4.4.0-36-generic

Best regards
David

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