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invalid fontset in face_for_char

From: Stefan Monnier
Subject: invalid fontset in face_for_char
Date: Fri, 15 Feb 2008 08:45:57 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) 
I get an xassert failure in face_for_char (fontset.c:983) here using my
MPC.el frontend to the MusicPD daemon.

I haven't done much debugging here because I don't know enough of what
is supposed to happen to go much further.  If someone could give me some
hints at what I should look that would be great,

Note that this face seems to be `variable-pitch' or related (the
"family" is set to "helv").  And indeed the `variable-pitch' face (and
those that inherit from it) are shown with a square box.


        Stefan


Starting program: /home/monnier/src/emacs/trunk/src/emacs -f mpc
Breakpoint 1 at 0x8271834: file emacs.c, line 429.
Breakpoint 2 at 0x82b69f3: file sysdep.c, line 1317.
[Thread debugging using libthread_db enabled]
[New Thread 0xb73898c0 (LWP 12855)]
[Switching to Thread 0xb73898c0 (LWP 12855)]

Breakpoint 1, abort () at emacs.c:429
(gdb) up
#1  0x0823e621 in face_for_char (f=0x91d7740, face=0x93b8578, c=8230, pos=5, 
    object=
        {i = 1765678560, s = {val = 155065824, type = Lisp_String}, u = {val = 
155065824, type = Lisp_String}}) at fontset.c:983
(gdb) bt
#0  abort () at emacs.c:429
#1  0x0823e621 in face_for_char (f=0x91d7740, face=0x93b8578, c=8230, pos=5, 
    object=
        {i = 1765678560, s = {val = 155065824, type = Lisp_String}, u = {val = 
155065824, type = Lisp_String}}) at fontset.c:983
#2  0x0809ac2f in get_next_display_element (it=0xbfed2120) at xdisp.c:5998
#3  0x080c9a59 in display_string (string=0x0, lisp_string=
        {i = 1765678560, s = {val = 155065824, type = Lisp_String}, u = {val = 
155065824, type = Lisp_String}}, face_string=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}, face_string_pos=0, start=0, it=0xbfed2120, 
    field_width=0, precision=-1, max_x=372, multibyte=1) at xdisp.c:18546
#4  0x080c5cef in display_mode_element (it=0xbfed2120, depth=3, 
    field_width=-1, precision=-1, elt=
        {i = 1765678560, s = {val = 155065824, type = Lisp_String}, u = {val = 
155065824, type = Lisp_String}}, props=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}, risky=0) at xdisp.c:17140
#5  0x080c6e78 in display_mode_element (it=0xbfed2120, depth=1, 
    field_width=0, precision=0, elt=
        {i = 2839470144, s = {val = 155115584, type = Lisp_Cons}, u = {val = 
155115584, type = Lisp_Cons}}, props=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}, risky=0) at xdisp.c:17435
#6  0x080c506d in display_mode_line (w=0x93e9318, 
    face_id=HEADER_LINE_FACE_ID, format=
        {i = 2839470152, s = {val = 155115592, type = Lisp_Cons}, u = {val = 
155115592, type = Lisp_Cons}}) at xdisp.c:16946
#7  0x080c4f1a in display_mode_lines (w=0x93e9318) at xdisp.c:16898
#8  0x080b86af in redisplay_window (window=
        {i = 2302579480, s = {val = 155095832, type = Lisp_Vectorlike}, u = 
{val = 155095832, type = Lisp_Vectorlike}}, just_this_one_p=0) at xdisp.c:13678
#9  0x080b0f3e in redisplay_window_0 (window=
        {i = 2302579480, s = {val = 155095832, type = Lisp_Vectorlike}, u = 
{val = 155095832, type = Lisp_Vectorlike}}) at xdisp.c:12042
#10 0x08387645 in internal_condition_case_1 (
    bfun=0x80b0f0b <redisplay_window_0>, arg=
        {i = 2302579480, s = {val = 155095832, type = Lisp_Vectorlike}, u = 
{val = 155095832, type = Lisp_Vectorlike}}, handlers=
        {i = 2828342608, s = {val = 143988048, type = Lisp_Cons}, u = {val = 
143988048, type = Lisp_Cons}}, hfun=0x80b0ee1 <redisplay_window_error>)
    at eval.c:1542
#11 0x080b0ec3 in redisplay_windows (window=
        {i = 2302579480, s = {val = 155095832, type = Lisp_Vectorlike}, u = 
{val = 155095832, type = Lisp_Vectorlike}}) at xdisp.c:12021
#12 0x080b0de2 in redisplay_windows (window=
        {i = 2302687128, s = {val = 155203480, type = Lisp_Vectorlike}, u = 
{val = 155203480, type = Lisp_Vectorlike}}) at xdisp.c:12013
#13 0x080b0e04 in redisplay_windows (window=
        {i = 2302615896, s = {val = 155132248, type = Lisp_Vectorlike}, u = 
{val = 155132248, type = Lisp_Vectorlike}}) at xdisp.c:12015
#14 0x080ae88c in redisplay_internal (preserve_echo_area=0) at xdisp.c:11589
#15 0x080aaa26 in redisplay () at xdisp.c:10796
#16 0x0827d991 in read_char (commandflag=1, nmaps=3, maps=0xbfed3850, 
    prev_event=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}, used_mouse_menu=0xbfed3a38, end_time=0x0)
    at keyboard.c:2724
#17 0x0829536a in read_key_sequence (keybuf=0xbfed3dd8, bufsize=30, prompt=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}, dont_downcase_last=0, 
    can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9460
#18 0x08277740 in command_loop_1 () at keyboard.c:1655
#19 0x08387510 in internal_condition_case (bfun=0x8276dd7 <command_loop_1>, 
    handlers=
        {i = 680915304, s = {val = 144044392, type = Lisp_Symbol}, u = {val = 
144044392, type = Lisp_Symbol}}, hfun=0x82763a3 <cmd_error>) at eval.c:1494
#20 0x0827692b in command_loop_2 () at keyboard.c:1370
#21 0x08386da6 in internal_catch (tag=
        {i = 680911208, s = {val = 144040296, type = Lisp_Symbol}, u = {val = 
144040296, type = Lisp_Symbol}}, func=0x8276901 <command_loop_2>, arg=
        {i = 680872136, s = {val = 144001224, type = Lisp_Symbol}, u = {val = 
144001224, type = Lisp_Symbol}}) at eval.c:1230
#22 0x082768cb in command_loop () at keyboard.c:1349
#23 0x08275a05 in recursive_edit_1 () at keyboard.c:958
#24 0x08275f7a in Frecursive_edit () at keyboard.c:1020
#25 0x08273acb in main (argc=3, argv=0xbfed45b4) at emacs.c:1786
(gdb) p *face
$11 = {
  id = 5, 
  gc = 0x93f32f8, 
  font = 0x0, 
  stipple = 0, 
  foreground = 0, 
  background = 15066597, 
  underline_color = 0, 
  overline_color = 0, 
  strike_through_color = 0, 
  box_color = 12566463, 
  font_name = 0x0, 
  font_info_id = -1, 
  font_info = 0x0, 
  fontset = -1, 
  pixmap_w = 0, 
  pixmap_h = 0, 
  box_line_width = 1, 
  box = FACE_RAISED_BOX, 
  use_box_color_for_shadows_p = 1, 
  lface = {{
      i = 680872472, 
      s = {
        val = 144001560, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001560, 
        type = Lisp_Symbol
      }
    }, {
      i = 1756577824, 
      s = {
        val = 145965088, 
        type = Lisp_String
      }, 
      u = {
        val = 145965088, 
        type = Lisp_String
      }
    }, {
      i = 680898912, 
      s = {
        val = 144028000, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144028000, 
        type = Lisp_Symbol
      }
    }, {
      i = 91, 
      s = {
        val = 91, 
        type = Lisp_Int
      }, 
      u = {
        val = 91, 
        type = Lisp_Int
      }
    }, {
      i = 680898528, 
      s = {
        val = 144027616, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144027616, 
        type = Lisp_Symbol
      }
    }, {
      i = 680898528, 
      s = {
        val = 144027616, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144027616, 
        type = Lisp_Symbol
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 1760011424, 
      s = {
        val = 149398688, 
        type = Lisp_String
      }, 
      u = {
        val = 149398688, 
        type = Lisp_String
      }
    }, {
      i = 1759015016, 
      s = {
        val = 148402280, 
        type = Lisp_String
      }, 
      u = {
        val = 148402280, 
        type = Lisp_String
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 2839004112, 
      s = {
        val = 154649552, 
        type = Lisp_Cons
      }, 
      u = {
        val = 154649552, 
        type = Lisp_Cons
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 680872136, 
      s = {
        val = 144001224, 
        type = Lisp_Symbol
      }, 
      u = {
        val = 144001224, 
        type = Lisp_Symbol
      }
    }, {
      i = 6, 
      s = {
        val = 6, 
        type = Lisp_Int
      }, 
      u = {
        val = 6, 
        type = Lisp_Int
      }
    }, {
      i = 1760361592, 
      s = {
        val = 149748856, 
        type = Lisp_String
      }, 
      u = {
        val = 149748856, 
        type = Lisp_String
      }
    }}, 
  hash = 680900319, 
  underline_p = 0, 
  overline_p = 0, 
  strike_through_p = 0, 
  foreground_defaulted_p = 0, 
  background_defaulted_p = 0, 
  underline_defaulted_p = 0, 
  overline_color_defaulted_p = 0, 
  strike_through_color_defaulted_p = 0, 
  box_color_defaulted_p = 1, 
  tty_bold_p = 0, 
  tty_dim_p = 0, 
  tty_underline_p = 0, 
  tty_alt_charset_p = 0, 
  tty_reverse_p = 0, 
  tty_blinking_p = 0, 
  colors_copied_bitwise_p = 0, 
  overstrike = 0, 
  next = 0x0, 
  prev = 0x0, 
  ascii_face = 0x93b8578, 
  extra = 0x0
}
(gdb) p face->lface
$12 = {{
    i = 680872472, 
    s = {
      val = 144001560, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001560, 
      type = Lisp_Symbol
    }
  }, {
    i = 1756577824, 
    s = {
      val = 145965088, 
      type = Lisp_String
    }, 
    u = {
      val = 145965088, 
      type = Lisp_String
    }
  }, {
    i = 680898912, 
    s = {
      val = 144028000, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144028000, 
      type = Lisp_Symbol
    }
  }, {
    i = 91, 
    s = {
      val = 91, 
      type = Lisp_Int
    }, 
    u = {
      val = 91, 
      type = Lisp_Int
    }
  }, {
    i = 680898528, 
    s = {
      val = 144027616, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144027616, 
      type = Lisp_Symbol
    }
  }, {
    i = 680898528, 
    s = {
      val = 144027616, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144027616, 
      type = Lisp_Symbol
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 1760011424, 
    s = {
      val = 149398688, 
      type = Lisp_String
    }, 
    u = {
      val = 149398688, 
      type = Lisp_String
    }
  }, {
    i = 1759015016, 
    s = {
      val = 148402280, 
      type = Lisp_String
    }, 
    u = {
      val = 148402280, 
      type = Lisp_String
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 2839004112, 
    s = {
      val = 154649552, 
      type = Lisp_Cons
    }, 
    u = {
      val = 154649552, 
      type = Lisp_Cons
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 680872136, 
    s = {
      val = 144001224, 
      type = Lisp_Symbol
    }, 
    u = {
      val = 144001224, 
      type = Lisp_Symbol
    }
  }, {
    i = 6, 
    s = {
      val = 6, 
      type = Lisp_Int
    }, 
    u = {
      val = 6, 
      type = Lisp_Int
    }
  }, {
    i = 1760361592, 
    s = {
      val = 149748856, 
      type = Lisp_String
    }, 
    u = {
      val = 149748856, 
      type = Lisp_String
    }
  }}
(gdb) p face->lface[0]
$13 = {
  i = 680872472, 
  s = {
    val = 144001560, 
    type = Lisp_Symbol
  }, 
  u = {
    val = 144001560, 
    type = Lisp_Symbol
  }
}
(gdb) pr
face
(gdb) p face->lface[1]
$14 = {
  i = 1756577824, 
  s = {
    val = 145965088, 
    type = Lisp_String
  }, 
  u = {
    val = 145965088, 
    type = Lisp_String
  }
}
(gdb) pr
"helv"
(gdb)
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