[Bug shlibs/15058] New: crash invoking "file" when solibs present

["tromey at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15058

             Bug #: 15058
           Summary: crash invoking "file" when solibs present
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: shlibs
        AssignedTo: unassigned@sourceware.org
        ReportedBy: tromey@redhat.com
    Classification: Unclassified


While debugging a patch on HPPA, I noticed a pre-existing
crash in py-block.exp.

The crash occurs because invoking "file" with no arguments
calls:

#0  set_target_gdbarch (new_gdbarch=0x402059f0)
    at ../../archer/gdb/gdbarch.c:4647
#1  0x002baad0 in set_gdbarch_from_file (abfd=0x0)
    at ../../archer/gdb/arch-utils.c:559
#2  0x002f1944 in exec_file_attach (filename=0x0, from_tty=1)
    at ../../archer/gdb/exec.c:204
#3  0x002f1e88 in exec_file_command (args=0x0, from_tty=1)
    at ../../archer/gdb/exec.c:344
#4  0x002f1eec in file_command (arg=0x0, from_tty=1)
    at ../../archer/gdb/exec.c:356

On this machine, this changes the target_gdbarch.

Then, later, free_so is called to destroy an solib.
However, it now gets the wrong 'ops' vector.
This proceeds to treat the lm_info as an object of the wrong
type -- it calls solib_target_free_so rather than
som_free_so

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