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From: "dvitek at grammatech dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/13294] New: printing bit field causes infinite loop
Date: Thu, 13 Oct 2011 22:35:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13294

             Bug #: 13294
           Summary: printing bit field causes infinite loop
           Product: gdb
           Version: 7.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dvitek@grammatech.com
    Classification: Unclassified


I think this is a duplicate of bug 9261, but that one is with an extremely old
version of gdb and is reported in the ada component.  I have below a minimal C
test case that reproduces the problem.

This is on an x86_64 ubuntu system using gcc version 4.4.1 (Ubuntu
4.4.1-4ubuntu9).

gdb --version says: GNU gdb (GDB) 7.0-ubuntu

/* Build me with gcc -g -o foo foo.c */

/* bug doesn't repro without the typedef (weird?) */
typedef unsigned char ui8;

typedef struct _S _S, *S;
struct _S{
    ui8 a : 1;
    ui8 b : 1;
    ui8 c : 1;
    ui8 d : 1;
};

int main()
{
    _S s;
    S p = &s;
    /* break on or single step to the return statement.
     * Type "p p->d" in GDB.
     * GDB will go into an infinite loop.
     * When I attach gdb to gdb, it seems to be getting SIGFPE.
     * Maybe a division by zero? 
     */
    return 0;
}

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