Subject: 24.0.50; Emacs terminates when Doc-view tries to render certain pdf files

From: Evans Winner <[email-masked]>
Date: Thu, 24 Mar 2011 16:25:14 -0600

I built Emacs bzr trunk cleanly about a month ago and
noticed this behavior, then a fresh build last night and see
the same thing.

Starting with emacs -Q, find a .pdf file and let doc-view
render it.  This works fine for many pdf files, but for some
files Emacs crashes and leaves the following message on the
terminal from which it was started:

emacs: wand/magick-wand.c:176: DestroyMagickWand: Assertion `wand != (MagickWand *) ((void *)0)' failed.
Fatal error (6)Aborted

I have spent some time looking at pdf files in a separate
reader.  So far most of the files that cause the failure
were created by some program by Adobe; at least one was
created by something called pdfFactory.  Unfortunately, the
failure is not even consistent with a given file.  Most
times it happens, but once in a while it passes the first
moment of rendering and then does the whole file.  If the
failure happens it happens in the first few seconds after
rendering has begun.  I have not tried to associate the
problem with a specific embedded font, as many of the files
list numerous such, but if that seems a likely cause I could
do so.  This Emacs was built with just ./configure by
itself, without any special debugging switches.  I can
re-build it if necessary, and if told what to pass to
configure.

==============================

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This is free software: you are free to change and redistribute it.
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This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/thorne/src/emacs/src/emacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = localhost:10.0
TERM = dumb
(gdb) run -Q
Starting program: /home/thorne/src/emacs/src/emacs -Q
[Thread debugging using libthread_db enabled]
[New Thread 0xb7b83b70 (LWP 19819)]
(gdb) bt full
#0  0x0012e416 in __kernel_vsyscall ()
No symbol table info available.
#1  0x01370941 in raise () from /lib/libc.so.6
No symbol table info available.
#2  0x01373e42 in abort () from /lib/libc.so.6
No symbol table info available.
#3  0x013698e8 in __assert_fail () from /lib/libc.so.6
No symbol table info available.
#4  0x00dc18e8 in DestroyMagickWand () from /usr/lib/libMagickWand.so.3
No symbol table info available.
#5  0x0811992f in imagemagick_load_image (f=<value optimized out>, img=0x880e100, contents=<value optimized out>, size=0, filename=0x8a00628 "/tmp/docview1000/algebra-demystified-1.pdf-44f292dffa5631820247fcf3c32967bc/page-1.png") at image.c:7807
        width = 135389324
        height = <value optimized out>
        status = MagickFalse
        ximg = 0xbfffa778
        x = <value optimized out>
        y = 138834401
        image_wand = 0x0
        ping_wand = 0x0
        iterator = 0x0
        pixels = <value optimized out>
        pixel = {
          storage_class = DirectClass, 
          colorspace = 3221202748, 
          matte = 138490058, 
          fuzz = -1.9783859252929703, 
          depth = 21622772, 
          red = -1.9790725756031264, 
          green = 8.4863299608835916e-269, 
          blue = 6.6783667147957593e-268, 
          opacity = 8.3711971908554814e-270, 
          index = 8.4382954765264012e-268
        }
        image = 138490058
        value = 0
        crop = <value optimized out>
        desired_width = 0
        desired_height = 144822016
        rotation = 0.2373809814453125
        imagemagick_rendermethod = <value optimized out>
        image_info = <value optimized out>
        exception = 0x8a1cf00
        im_image = 0x0
#6  0x0811f905 in lookup_image (f=0x8760d08, spec=142335142) at image.c:1740
        img = 0x880e100
        hash = 0
        now = {
          tv_sec = 0, 
          tv_usec = 136424055
        }
#7  0x08079c37 in handle_single_display_spec (it=0xbfffa9a0, spec=<value optimized out>, object=<value optimized out>, overlay=138509115, position=0xbfffaa48, display_replaced_before_p=0) at xdisp.c:4241
        form = <value optimized out>
        location = 138490034
        value = <value optimized out>
#8  0x0807a330 in handle_display_prop (it=0xbfffa9a0) at xdisp.c:3852
        prop = 142335142
        object = 142697789
        overlay = 138509115
        position = 0xbfffaa48
        display_replaced_p = <value optimized out>
#9  0x080730df in handle_stop (it=0xbfffa9a0) at xdisp.c:2921
        handled = HANDLED_NORMALLY
        handle_overlay_change_p = <value optimized out>
        p = 0x822e598
#10 0x0807342f in reseat (it=0xbfffa9a0, pos=<value optimized out>, force_p=1) at xdisp.c:5371
        original_pos = 1
#11 0x080811cc in start_display (it=0xbfffa9a0, w=0x0, pos=...) at xdisp.c:2647
        first_vpos = 0
#12 0x08083ed9 in try_window (window=141954709, pos=..., flags=1) at xdisp.c:14487
        w = 0x8760e90
        it = {
          window = 141954709, 
          w = 0x8760e90, 
          f = 0x8760d08, 
          method = GET_FROM_BUFFER, 
          stop_charpos = 1671147, 
          prev_stop = 0, 
          base_level_stop = 0, 
          end_charpos = 1671147, 
          s = 0x0, 
          string_nchars = 0, 
          region_beg_charpos = -1, 
          region_end_charpos = -1, 
          redisplay_end_trigger_charpos = 0, 
          multibyte_p = 0, 
          header_line_p = 0, 
          string_from_display_prop_p = 0, 
          ellipsis_p = 0, 
          avoid_cursor_p = 0, 
          dp = 0x0, 
          dpvec = 0x0, 
          dpend = 0x0, 
          dpvec_char_len = 0, 
          dpvec_face_id = 0, 
          saved_face_id = -1, 
          ctl_chars = {0 <repeats 16 times>}, 
          start = {
            pos = {
              charpos = 1, 
              bytepos = 1
            }, 
            overlay_string_index = -1, 
            string_pos = {
              charpos = -1, 
              bytepos = -1
            }, 
            dpvec_index = -1
          }, 
          current = {
            pos = {
              charpos = 1671147, 
              bytepos = 1671147
            }, 
            overlay_string_index = -1, 
            string_pos = {
              charpos = -1, 
              bytepos = -1
            }, 
            dpvec_index = -1
          }, 
          n_overlay_strings = 0, 
          overlay_strings_charpos = 0, 
          overlay_strings = {0 <repeats 16 times>}, 
          string_overlays = {0 <repeats 16 times>}, 
          string = 138490058, 
          from_overlay = 138509115, 
          stack = {{
              string = 138490058, 
              string_nchars = 0, 
              end_charpos = 1671147, 
              stop_charpos = 1671147, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = -1, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 11, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 1671147, 
                bytepos = 1671147
              }, 
              current = {
                pos = {
                  charpos = 1671147, 
                  bytepos = 1671147
                }, 
                overlay_string_index = -1, 
                string_pos = {
                  charpos = -1, 
                  bytepos = -1
                }, 
                dpvec_index = -1
              }, 
              from_overlay = 0, 
              area = TEXT_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = WINDOW_WRAP, 
              voffset = 0, 
              space_width = 138490058, 
              font_height = 138490058
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }}, 
          sp = 1, 
          selective = 0, 
          what = IT_IMAGE, 
          face_id = 11, 
          selective_display_ellipsis_p = 1, 
          ctl_arrow_p = 1, 
          face_box_p = 0, 
          start_of_box_run_p = 0, 
          end_of_box_run_p = 0, 
          overlay_strings_at_end_processed_p = 0, 
          ignore_overlay_strings_at_pos_p = 0, 
          glyph_not_available_p = 0, 
          starts_in_middle_of_char_p = 0, 
          face_before_selective_p = 0, 
          constrain_row_ascent_descent_p = 0, 
          line_wrap = WINDOW_WRAP, 
          base_face_id = 0, 
          c = 0, 
          len = 0, 
          cmp_it = {
            stop_pos = 0, 
            id = -1, 
            ch = 0, 
            rule_idx = 0, 
            lookback = 0, 
            nglyphs = 0, 
            reversed_p = 0, 
            charpos = 0, 
            nchars = 0, 
            nbytes = 0, 
            from = 0, 
            to = 0, 
            width = 0
          }, 
          char_to_display = 0, 
          glyphless_method = GLYPHLESS_DISPLAY_THIN_SPACE, 
          image_id = 0, 
          slice = {
            x = 138490058, 
            y = 138490058, 
            width = 138490058, 
            height = 138490058
          }, 
          space_width = 138490058, 
          voffset = 0, 
          tab_width = 8, 
          font_height = 138490058, 
          object = 142697789, 
          position = {
            charpos = 1, 
            bytepos = 1
          }, 
          truncation_pixel_width = 0, 
          continuation_pixel_width = 0, 
          first_visible_x = 0, 
          last_visible_x = 560, 
          last_visible_y = 494, 
          extra_line_spacing = 0, 
          max_extra_line_spacing = 0, 
          override_ascent = -1, 
          override_descent = 0, 
          override_boff = 0, 
          glyph_row = 0x86e9be0, 
          area = TEXT_AREA, 
          nglyphs = 0, 
          pixel_width = 0, 
          ascent = 0, 
          descent = 0, 
          max_ascent = 0, 
          max_descent = 0, 
          phys_ascent = 0, 
          phys_descent = 0, 
          max_phys_ascent = 0, 
          max_phys_descent = 0, 
          current_x = 0, 
          continuation_lines_width = 0, 
          eol_pos = {
            charpos = 0, 
            bytepos = 0
          }, 
          current_y = 0, 
          first_vpos = 0, 
          vpos = 0, 
          hpos = 0, 
          left_user_fringe_bitmap = 0, 
          right_user_fringe_bitmap = 0, 
          left_user_fringe_face_id = 0, 
          right_user_fringe_face_id = 0, 
          bidi_p = 0, 
          bidi_it = {
            bytepos = 0, 
            charpos = 0, 
            ch = 0, 
            ch_len = 0, 
            type = UNKNOWN_BT, 
            type_after_w1 = UNKNOWN_BT, 
            orig_type = UNKNOWN_BT, 
            resolved_level = 0, 
            invalid_levels = 0, 
            invalid_rl_levels = 0, 
            prev_was_pdf = 0, 
            prev = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            last_strong = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_for_neutral = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            prev_for_neutral = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_for_ws = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_en_pos = 0, 
            ignore_bn_limit = 0, 
            sor = NEUTRAL_DIR, 
            scan_dir = 0, 
            stack_idx = 0, 
            level_stack = {{
                level = 0, 
                override = NEUTRAL_DIR
              } <repeats 64 times>}, 
            first_elt = 0, 
            paragraph_dir = NEUTRAL_DIR, 
            new_paragraph = 0, 
            separator_limit = 0
          }, 
          paragraph_embedding = NEUTRAL_DIR
        }
        last_text_row = 0x0
#13 0x08099692 in redisplay_window (window=<value optimized out>, just_this_one_p=<value optimized out>) at xdisp.c:14110
        w = 0x8760e90
        f = 0x8760d08
        buffer = <value optimized out>
        old = 0x8816538
        update_mode_line = 1
        tem = <value optimized out>
        it = {
          window = -1073752696, 
          w = 0x7b, 
          f = 0x1f80, 
          method = GET_FROM_BUFFER, 
          stop_charpos = 141954312, 
          prev_stop = 0, 
          base_level_stop = -1073752856, 
          end_charpos = -1073755024, 
          s = 0x8760fc8 "3\020", 
          string_nchars = 0, 
          region_beg_charpos = -1073752856, 
          region_end_charpos = 134758141, 
          redisplay_end_trigger_charpos = -1073755024, 
          multibyte_p = 0, 
          header_line_p = 0, 
          string_from_display_prop_p = 0, 
          ellipsis_p = 1, 
          avoid_cursor_p = 0, 
          dp = 0x1, 
          dpvec = 0x1, 
          dpend = 0x0, 
          dpvec_char_len = -1073754300, 
          dpvec_face_id = 1, 
          saved_face_id = 135238909, 
          ctl_chars = {15, 141954317, 1, 142782904, 141955021, 141955016, 141954312, 0, 64, 0, 0, 64, 0, 0, -1, -1}, 
          start = {
            pos = {
              charpos = 0, 
              bytepos = 0
            }, 
            overlay_string_index = 0, 
            string_pos = {
              charpos = 0, 
              bytepos = 0
            }, 
            dpvec_index = 0
          }, 
          current = {
            pos = {
              charpos = 0, 
              bytepos = -1
            }, 
            overlay_string_index = 0, 
            string_pos = {
              charpos = 0, 
              bytepos = 0
            }, 
            dpvec_index = 0
          }, 
          n_overlay_strings = 0, 
          overlay_strings_charpos = 0, 
          overlay_strings = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 64, -1, -1, -1, -1}, 
          string_overlays = {64, 64, -1, -1, -1, -1, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0}, 
          string = 0, 
          from_overlay = 0, 
          stack = {{
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 138490058, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }, {
              string = 0, 
              string_nchars = 0, 
              end_charpos = 0, 
              stop_charpos = 0, 
              prev_stop = 0, 
              base_level_stop = 0, 
              cmp_it = {
                stop_pos = 0, 
                id = 0, 
                ch = 0, 
                rule_idx = 0, 
                lookback = 0, 
                nglyphs = 0, 
                reversed_p = 0, 
                charpos = 0, 
                nchars = 0, 
                nbytes = 0, 
                from = 0, 
                to = 0, 
                width = 0
              }, 
              face_id = 0, 
              u = {
                image = {
                  object = 0, 
                  slice = {
                    x = 0, 
                    y = 0, 
                    width = 0, 
                    height = 0
                  }, 
                  image_id = 0
                }, 
                comp = {
                  object = 0
                }, 
                stretch = {
                  object = 0
                }
              }, 
              position = {
                charpos = 0, 
                bytepos = 0
              }, 
              current = {
                pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                overlay_string_index = 0, 
                string_pos = {
                  charpos = 0, 
                  bytepos = 0
                }, 
                dpvec_index = 0
              }, 
              from_overlay = 0, 
              area = LEFT_MARGIN_AREA, 
              method = GET_FROM_BUFFER, 
              multibyte_p = 0, 
              string_from_display_prop_p = 0, 
              display_ellipsis_p = 0, 
              avoid_cursor_p = 0, 
              line_wrap = TRUNCATE, 
              voffset = 0, 
              space_width = 0, 
              font_height = 0
            }}, 
          sp = 0, 
          selective = 0, 
          what = IT_CHARACTER, 
          face_id = 0, 
          selective_display_ellipsis_p = 0, 
          ctl_arrow_p = 0, 
          face_box_p = 0, 
          start_of_box_run_p = 0, 
          end_of_box_run_p = 0, 
          overlay_strings_at_end_processed_p = 0, 
          ignore_overlay_strings_at_pos_p = 0, 
          glyph_not_available_p = 0, 
          starts_in_middle_of_char_p = 0, 
          face_before_selective_p = 0, 
          constrain_row_ascent_descent_p = 0, 
          line_wrap = TRUNCATE, 
          base_face_id = 0, 
          c = 0, 
          len = 0, 
          cmp_it = {
            stop_pos = 0, 
            id = 0, 
            ch = 0, 
            rule_idx = 0, 
            lookback = 0, 
            nglyphs = 0, 
            reversed_p = 0, 
            charpos = 0, 
            nchars = 0, 
            nbytes = 0, 
            from = 0, 
            to = 0, 
            width = 0
          }, 
          char_to_display = 0, 
          glyphless_method = GLYPHLESS_DISPLAY_THIN_SPACE, 
          image_id = 0, 
          slice = {
            x = 0, 
            y = 5, 
            width = 0, 
            height = 35
          }, 
          space_width = 2, 
          voffset = 0, 
          tab_width = 0, 
          font_height = 46, 
          object = 1, 
          position = {
            charpos = 64, 
            bytepos = -1
          }, 
          truncation_pixel_width = -2, 
          continuation_pixel_width = -1, 
          first_visible_x = 0, 
          last_visible_x = 0, 
          last_visible_y = 0, 
          extra_line_spacing = 0, 
          max_extra_line_spacing = 0, 
          override_ascent = 0, 
          override_descent = 0, 
          override_boff = 0, 
          glyph_row = 0x0, 
          area = LEFT_MARGIN_AREA, 
          nglyphs = 46, 
          pixel_width = 0, 
          ascent = 0, 
          descent = 138490058, 
          max_ascent = 138490058, 
          max_descent = 138490058, 
          phys_ascent = 138490058, 
          phys_descent = 138490058, 
          max_phys_ascent = 524288, 
          max_phys_descent = 138490058, 
          current_x = 142782909, 
          continuation_lines_width = 64, 
          eol_pos = {
            charpos = 64, 
            bytepos = 0
          }, 
          current_y = 0, 
          first_vpos = 560, 
          vpos = 15, 
          hpos = 0, 
          left_user_fringe_bitmap = 0, 
          right_user_fringe_bitmap = 0, 
          left_user_fringe_face_id = 1048575, 
          right_user_fringe_face_id = 0, 
          bidi_p = 0, 
          bidi_it = {
            bytepos = 141957708, 
            charpos = 1, 
            ch = 1, 
            ch_len = 7, 
            type = PDF, 
            type_after_w1 = WEAK_EN, 
            orig_type = UNKNOWN_BT, 
            resolved_level = 0, 
            invalid_levels = 0, 
            invalid_rl_levels = 0, 
            prev_was_pdf = 0, 
            prev = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            last_strong = {
              bytepos = 15, 
              charpos = 0, 
              type = STRONG_L, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_for_neutral = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            prev_for_neutral = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_for_ws = {
              bytepos = 0, 
              charpos = 0, 
              type = UNKNOWN_BT, 
              type_after_w1 = UNKNOWN_BT, 
              orig_type = UNKNOWN_BT
            }, 
            next_en_pos = 0, 
            ignore_bn_limit = 0, 
            sor = NEUTRAL_DIR, 
            scan_dir = 0, 
            stack_idx = 0, 
            level_stack = {{
                level = 0, 
                override = NEUTRAL_DIR
              } <repeats 53 times>, {
                level = 138613586, 
                override = 3221214264
              }, {
                level = 135892260, 
                override = 138613586
              }, {
                level = 142335526, 
                override = NEUTRAL_DIR
              }, {
                level = 0, 
                override = NEUTRAL_DIR
              }, {
                level = 0, 
                override = NEUTRAL_DIR
              }, {
                level = 139904608, 
                override = 142697784
              }, {
                level = 142782904, 
                override = 3221214296
              }, {
                level = 135892623, 
                override = NEUTRAL_DIR
              }, {
                level = 0, 
                override = NEUTRAL_DIR
              }, {
                level = 0, 
                override = NEUTRAL_DIR
              }, {
                level = 138613586, 
                override = 3221214328
              }}, 
            first_elt = 138509592, 
            paragraph_dir = 142783992, 
            new_paragraph = 138584456, 
            separator_limit = -1073752920
          }, 
          paragraph_embedding = 135669132
        }
        current_matrix_up_to_date_p = 0
        used_current_matrix_p = 142644244
        buffer_unchanged_p = 0
        temp_scroll_step = 1
        rc = <value optimized out>
        centering_position = 0
        last_line_misfit = 0
        beg_unchanged = 1
        end_unchanged = 0
#14 0x0809b713 in redisplay_window_0 (window=141954709) at xdisp.c:12361
No locals.
#15 0x081aac37 in internal_condition_case_1 (bfun=0x809b6f0 <redisplay_window_0>, arg=141954709, handlers=138472190, hfun=0x806ac50 <redisplay_window_error>) at eval.c:1455
        val = 0
        c = {
          tag = 138490058, 
          val = 138490058, 
          next = 0xbffff004, 
          gcpro = 0x0, 
          jmp = {{
              __jmpbuf = {141954704, 141954312, 138739712, -1073752680, -935130977, 45984752}, 
              __mask_was_saved = 0, 
              __saved_mask = {
                __val = {142783997, 138490058, 3221214504, 1600000, 80, 138526690, 3221214488, 135894730, 138526690, 1600000, 138490058, 0, 1600000, 1600000, 3221214568, 135950727, 138526690, 1600000, 3221214568, 134696049, 6, 138490058, 0, 138526690, 141955016, 134758656, 138490058, 138526688, 138526690, 1073741820, 138490058, 141954312}
              }
            }}, 
          backlist = 0x0, 
          handlerlist = 0xbffff0cc, 
          lisp_eval_depth = 0, 
          pdlcount = 5, 
          poll_suppress_count = 1, 
          interrupt_input_blocked = 0, 
          byte_stack = 0x0
        }
        h = {
          handler = 138472190, 
          var = 138490058, 
          chosen_clause = 138472200, 
          tag = 0xbfffd4b4, 
          next = 0xbffff0cc
        }
#16 0x0807494f in redisplay_windows (window=19815) at xdisp.c:12341
        w = 0x8760e90
#17 0x08086d88 in redisplay_internal (preserve_echo_area=<value optimized out>) at xdisp.c:11918
        f = 0x8760d08
        tail = 6
        frame = <value optimized out>
        w = <value optimized out>
        sw = 0x8760e90
        pending = 0
        must_finish = 1
        number_of_visible_frames = <value optimized out>
        polling_stopped_here = 0
        old_frame = 141954317
        consider_all_windows_p = <value optimized out>
#18 0x080879c7 in redisplay_preserve_echo_area (from_where=8) at xdisp.c:12169
No locals.
#19 0x08143f32 in detect_input_pending_run_timers (do_display=1) at keyboard.c:10357
        old_timers_run = 17
#20 0x081e695d in wait_reading_process_output (time_limit=127, microsecs=0, read_kbd=-1, do_display=1, wait_for_cell=138490058, wait_proc=0x0, just_wait_proc=0) at process.c:4846
        old_timers_run = 17
        old_buffer = 0x8816538
        old_window = 141954709
        leave = <value optimized out>
        timeout_reduced_for_timers = 142697784
        channel = <value optimized out>
        nfds = 0
        Available = {
          fds_bits = {32776, 0 <repeats 31 times>}
        }
        Writeok = {
          fds_bits = {0 <repeats 32 times>}
        }
        check_write = -1208190988
        check_delay = <value optimized out>
        no_avail = 0
        xerrno = 11
        proc = <value optimized out>
        timeout = {
          tv_sec = 0, 
          tv_usec = 0
        }
        end_time = {
          tv_sec = 1301005071, 
          tv_usec = 26407
        }
        wait_channel = -1
        got_some_input = 0
#21 0x08059a20 in sit_for (timeout=508, reading=1, do_display=1) at dispnew.c:6017
        sec = 127
        usec = 6
#22 0x08145c75 in read_char (commandflag=1, nmaps=2, maps=0xbfffeda0, prev_event=138490058, used_mouse_menu=0xbfffeeb4, end_time=0x0) at keyboard.c:2597
        tem0 = <value optimized out>
        delay_level = <value optimized out>
        buffer_size = <value optimized out>
        c = 138490058
        local_getcjmp = {{
            __jmpbuf = {138490058, 142782909, 142570552, -1073746600, -935352161, 528048624}, 
            __mask_was_saved = 0, 
            __saved_mask = {
              __val = {138512250, 4, 142697789, 0, 138509115, 0 <repeats 20 times>, 142697789, 3221220664, 136290036, 142697784, 0, 0, 0}
            }
          }}
        save_jump = {{
            __jmpbuf = {0, 0, 0, 0, 0, 0}, 
            __mask_was_saved = 0, 
            __saved_mask = {
              __val = {0 <repeats 32 times>}
            }
          }}
        key_already_recorded = 0
        tem = <value optimized out>
        save = <value optimized out>
        previous_echo_area_message = 138490058
        also_record = 138490058
        reread = 0
        polling_stopped_here = <value optimized out>
        orig_kboard = 0x8642100
#23 0x08146bbc in read_key_sequence (keybuf=<value optimized out>, bufsize=<value optimized out>, prompt=<value optimized out>, dont_downcase_last=0, can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9191
        interrupted_kboard = 0x8642100
        key = <value optimized out>
        used_mouse_menu = 0
        echo_local_start = 0
        last_real_key_start = 0
        keys_local_start = 0
        from_string = <value optimized out>
        t = <value optimized out>
        echo_start = 0
        keys_start = 0
        nmaps = <value optimized out>
        nmaps_allocated = 2
        defs = 0xbfffed80
        submaps = <value optimized out>
        orig_local_map = 142184494
        orig_keymap = 138490058
        localized_local_map = 0
        first_binding = <value optimized out>
        first_unbound = <value optimized out>
        mock_input = <value optimized out>
        fkey = {
          parent = 142166078, 
          map = 142166078, 
          start = 0, 
          end = 0
        }
        keytran = {
          parent = 138477286, 
          map = 138477286, 
          start = 0, 
          end = 0
        }
        indec = {
          parent = 142166070, 
          map = 142166070, 
          start = 0, 
          end = 0
        }
        shift_translated = 0
        delayed_switch_frame = 138490058
        original_uppercase = 2
        original_uppercase_position = -1
        starting_buffer = 0x8816538
        fake_prefixed_keys = 138490058
#24 0x081488d2 in command_loop_1 () at keyboard.c:1411
        cmd = <value optimized out>
        keybuf = {52, 400, 134545122, -1208146616, 1232884, 20220304, 44, -1073745932, 1153233, 0, 276967387, 0, 0, 0, 44, 0, 0, 0, 0, -1073746008, -1073746224, 0, 0, 138490058, 139626834, -541146624, -1472036457, 0, 78, 138750920}
        i = <value optimized out>
        prev_modiff = 168
        prev_buffer = 0x89b2848
#25 0x081aae71 in internal_condition_case (bfun=0x8148700 <command_loop_1>, handlers=138521074, hfun=0x81415a0 <cmd_error>) at eval.c:1410
        val = 0
        c = {
          tag = 138490058, 
          val = 138490058, 
          next = 0xbffff128, 
          gcpro = 0x0, 
          jmp = {{
              __jmpbuf = {138750920, 138750920, 138750936, -1073745688, -936007521, 45493232}, 
              __mask_was_saved = 0, 
              __saved_mask = {
                __val = {17, 3221222960, 0, 0, 0, 3221221600, 3221221528, 3221221540, 25042932, 1235224, 0, 24969218, 1175744, 134545857, 3086820680, 1232884, 20224492, 44, 3221221300, 1153233, 3221221324, 25025988, 141268968, 140638452, 141268968, 44, 20242000, 3086820744, 3221221568, 4294967295, 1232884, 134545857}
              }
            }}, 
          backlist = 0x0, 
          handlerlist = 0x0, 
          lisp_eval_depth = 0, 
          pdlcount = 2, 
          poll_suppress_count = 1, 
          interrupt_input_blocked = 0, 
          byte_stack = 0x0
        }
        h = {
          handler = 138521074, 
          var = 138490058, 
          chosen_clause = 134529364, 
          tag = 0xbffff004, 
          next = 0x0
        }
#26 0x08141245 in command_loop_2 (ignore=138490058) at keyboard.c:1129
        val = 0
#27 0x081ab181 in internal_catch (tag=138517498, func=0x8141220 <command_loop_2>, arg=138490058) at eval.c:1154
        c = {
          tag = 138517498, 
          val = 138490058, 
          next = 0x0, 
          gcpro = 0x0, 
          jmp = {{
              __jmpbuf = {138750920, 138750920, 138750936, -1073745416, -938973025, 42529776}, 
              __mask_was_saved = 0, 
              __saved_mask = {
                __val = {3221221860, 3221222008, 135532466, 3221221872, 0 <repeats 13 times>, 20662590, 0, 0, 0, 20662590, 0, 0, 138509800, 1, 138162912, 0, 14, 3221221964, 138658778, 138658776}
              }
            }}, 
          backlist = 0x0, 
          handlerlist = 0x0, 
          lisp_eval_depth = 0, 
          pdlcount = 2, 
          poll_suppress_count = 1, 
          interrupt_input_blocked = 0, 
          byte_stack = 0x0
        }
#28 0x081413f1 in command_loop () at keyboard.c:1108
No locals.
#29 0x0814179b in recursive_edit_1 () at keyboard.c:731
        val = <value optimized out>
#30 0x081418c2 in Frecursive_edit () at keyboard.c:793
        buffer = 138490058
#31 0x08137666 in main (argc=<value optimized out>, argv=<value optimized out>) at emacs.c:1685
        dummy = -1073744504
        stack_bottom_variable = 8 '\b'
        do_initial_setlocale = 138750920
        skip_args = 0
        rlim = {
          rlim_cur = 8388608, 
          rlim_max = 18446744073709551615
        }
        no_loadup = 0
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x149fce0 ""
(gdb) xbacktrace
(gdb) 

=============================================

All this below is from the Emacs instance from which I ran
gdb and sent the bug report:

In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
 of 2011-03-24 on braintron
Windowing system distributor `The X.Org Foundation', version 11.0.10706000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Debugger

Minor modes in effect:
  auto-insert-mode: t
  iswitchb-mode: t
  global-ede-mode: t
  show-paren-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
M-x g d b <return> e , a <backspace> <backspace> m 
a c s <return> <help-echo> <help-echo> e x i t <backspace> 
<backspace> <backspace> <backspace> e x i t <return> 
q u i t <return> y M-x t e r m <return> <return> g 
d b SPC e m a c s <return> q u i t <return> e x i t 
<return> C-x k <return> M-x g d b <return> <return> 
r u n SPC - Q <return> <down-mouse-1> <mouse-1> b t 
<return> C-x 1 <S-prior> <down-mouse-1> <mouse-1> <help-echo> 
<down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-1> <mouse-1> <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <down-mouse-5> <mouse-5> 
<down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<down-mouse-1> <mouse-1> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> C-x d <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> / f <backspace> d o <tab> <return> 
C-x k <return> C-x f C-g C-x d <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> / t m <tab> d o 
<tab> <return> C-x k <return> <down-mouse-5> <mouse-5> 
<double-down-mouse-5> <double-mouse-5> <down-mouse-4> 
<mouse-4> <double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <down-mouse-5> <mouse-5> <down-mouse-5> 
<mouse-5> M-x r e p o r t - e m <tab> b <tab> <ret
urn>

Recent messages:
Restoring clock data
Loading /home/thorne/.emacs.d/org-clock-save.el (source)...done
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When done with this frame, type C-x 5 0
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x-toolkit x multi-tty emacs)