[Bug gdb/13294] New: printing bit field causes infinite loop

[Bug gdb/13294] New: printing bit field causes infinite loop

[dvitek at grammatech dot com]

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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[Bug gdb/13294] printing bit field causes infinite loop

[dvitek at grammatech dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13294

--- Comment #1 from Dave Vitek <dvitek at grammatech dot com> 2011-10-13 22:53:05 UTC ---
The behavior does not reproduce when I compile gdb 7.3.1 myself.  So maybe it's
been fixed or the binaries from apt-get have issues.  Or something else I
haven't thought of yet.

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[Bug gdb/13294] printing bit field causes infinite loop

[pedro at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13294

Pedro Alves <pedro at codesourcery dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |pedro at codesourcery dot
                   |                            |com
         Resolution|                            |FIXED

--- Comment #2 from Pedro Alves <pedro at codesourcery dot com> 2011-10-14 10:15:13 UTC ---
I can't remember which commit fixed it, I believe it's been fixed.

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