Comment 2 for bug 1069897

My full backtrace on this (quantal 64bit):
#0 0x00007f8710ffe425 in __GI_raise (sig=<optimised out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <optimised out>
        selftid = 9345
#1 0x00007f8711001b8b in __GI_abort () at abort.c:91
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x4, sa_sigaction = 0x4}, sa_mask = {__val = {5,
              140734568085900, 3, 140218083851975, 3, 140734568080586, 6, 140218083851979, 2, 140734568080606,
              2, 140218083842978, 1, 140218083851975, 3, 140734568080580}}, sa_flags = 12,
          sa_restorer = 0x7f8711143ecb}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2 0x00007f871103c39e in __libc_message (do_abort=2,
    fmt=0x7f8711146028 "*** glibc detected *** %s: %s: 0x%s ***\n")
    at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
        ap = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fff51f02e40,
            reg_save_area = 0x7fff51f02d50}}
        ap_copy = {{gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7fff51f02e40,
            reg_save_area = 0x7fff51f02d50}}
        fd = 7
        on_2 = <optimised out>
        list = <optimised out>
        nlist = <optimised out>
        cp = <optimised out>
        written = <optimised out>
#3 0x00007f8711046b96 in malloc_printerr (action=3, str=0x7f8711146138 "double free or corruption (!prev)",
    ptr=<optimised out>) at malloc.c:5007
        buf = "0000000001a413d0"
        cp = <optimised out>
#4 0x00007f8711036815 in _IO_new_fclose (fp=0x1a413d0) at iofclose.c:88
        status = 0
#5 0x00000000006c42e3 in do_fclose_cleanup (arg=0x1a413d0) at /build/buildd/gdb-7.5/gdb/utils.c:234
        file = 0x1a413d0
#6 0x00000000005583b0 in do_my_cleanups (pmy_chain=0xbeca50 <cleanup_chain>,
    old_chain=0x83bea0 <sentinel_cleanup>) at /build/buildd/gdb-7.5/gdb/cleanups.c:155
        ptr = 0x1a36d40
#7 0x000000000055841d in do_cleanups (old_chain=0x83bea0 <sentinel_cleanup>)
    at /build/buildd/gdb-7.5/gdb/cleanups.c:177
No locals.
#8 0x00000000004d0d05 in source_script_with_search (file=0x1a3a140 "/home/dg/.gdbinit", from_tty=-1,
    search_path=0) at /build/buildd/gdb-7.5/gdb/cli/cli-cmds.c:621
---Type <return> to continue, or q <return> to quit---
        statbuf = {st_dev = 2065, st_ino = 1865834, st_nlink = 1, st_mode = 33204, st_uid = 1000,
          st_gid = 1000, __pad0 = 0, st_rdev = 0, st_size = 0, st_blksize = 4096, st_blocks = 0, st_atim = {
            tv_sec = 1353763933, tv_nsec = 376637381}, st_mtim = {tv_sec = 1353763932, tv_nsec = 668637382},
          st_ctim = {tv_sec = 1353763932, tv_nsec = 668637382}, __unused = {0, 0, 0}}
        fd = 7
        stream = 0x1a413d0
        full_path = 0x1989b60 "/home/dg/.gdbinit"
        old_cleanups = 0x83bea0 <sentinel_cleanup>
#9 0x00000000004d0d70 in source_script (file=0x1a3a140 "/home/dg/.gdbinit", from_tty=-1)
    at /build/buildd/gdb-7.5/gdb/cli/cli-cmds.c:642
No locals.
#10 0x00000000005c9cd7 in catch_command_errors (command=0x4d0d4b <source_script>,
    arg=0x1a3a140 "/home/dg/.gdbinit", from_tty=-1, mask=6) at /build/buildd/gdb-7.5/gdb/exceptions.c:573
        e = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
#11 0x00000000005cc6e2 in captured_main (data=0x7fff51f03210) at /build/buildd/gdb-7.5/gdb/main.c:849
        context = 0x7fff51f03210
        argc = 1
        argv = 0x7fff51f03318
        quiet = 0
        set_args = 0
        symarg = 0x0
        execarg = 0x0
        pidarg = 0x0
        corearg = 0x0
        pid_or_core_arg = 0x0
        cdarg = 0x0
        ttyarg = 0x0
        print_help = 0
        print_version = 0
        cmdarg_vec = 0x0
        cmdarg_p = 0x0
        dirarg = 0x18a3040
        dirsize = 1
        ndir = 0
        system_gdbinit = 0x19e4d30 "/etc/gdb/gdbinit"
        home_gdbinit = 0x1a3a140 "/home/dg/.gdbinit"
        local_gdbinit = 0x0
        i = 1374695696
        save_auto_load = 0
        objfile = 0x7fff51f03310
        pre_stat_chain = 0x83bea0 <sentinel_cleanup>
#12 0x00000000005c9c03 in catch_errors (func=0x5cba79 <captured_main>, func_args=0x7fff51f03210,
    errstring=0x8574d1 "", mask=6) at /build/buildd/gdb-7.5/gdb/exceptions.c:546
        val = 0
        exception = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
        saved_uiout = 0xbf04a0 <def_uiout>
#13 0x00000000005ccc5c in gdb_main (args=0x7fff51f03210) at /build/buildd/gdb-7.5/gdb/main.c:1008
No locals.
#14 0x000000000044e5aa in main (argc=1, argv=0x7fff51f03318) at /build/buildd/gdb-7.5/gdb/gdb.c:34
        args = {argc = 1, argv = 0x7fff51f03318, use_windows = 0, interpreter_p = 0x7ef184 "console"}