GNU bug report logs - #5856
24.0.50; Crash in redisplay

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Package: emacs;

Reported by: Jan Djärv <jan.h.d <at> swipnet.se>

Date: Wed, 7 Apr 2010 19:12:02 UTC

Severity: normal

Done: Jan Djärv <jan.h.d <at> swipnet.se>

Bug is archived. No further changes may be made.

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Message #11 received at 5856 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 5856 <at> debbugs.gnu.org
Subject: Re: bug#5856: 24.0.50; Crash in redisplay
Date: Thu, 08 Apr 2010 08:16:13 +0200

Eli Zaretskii skrev:
>> Date: Wed, 07 Apr 2010 21:11:13 +0200
>> From: Jan Djärv <jan.h.d <at> swipnet.se>
>> Cc: 
>>
>> Sometimes I get a segmentation violation and emacs dies.
>> I just managed to catch it in the debugger.  Backtrace below (very long,
>> but instructions says to give bt full),
>> Let me know if you need more info, I'll keep it in the debugger for a
>> couple of days.  This is from trunk, updated and built today (Apr 7, 2010).
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x000000000044d2f1 in set_cursor_from_row (w=0x1378d60, row=0x1fbf550,
>>      matrix=0x18217a0, delta=0, delta_bytes=0, dy=0, dvpos=0)
>>      at /home/jhd/src/emacs/fixes/src/xdisp.c:12775
>> 12775	  if (!(BUFFERP (glyph->object) && glyph->charpos == pt_old)
> 
> Ouch!  My bad, probably.
> 
> First, what caused the crash?  I think it's BUFFERP, so please tell
> what is glyph->object.
> 

(gdb) whatis glyph->object
type = Lisp_Object
(gdb) p glyph->object
$4 = 8079492959817000301
(gdb) pp glyph->object
#<INVALID_LISP_OBJECT 0x7020200a3b29656d>


> Also, can you tell something about what were you doing at the moment
> of the crash?  It looks like you were typing in the minibuffer, is
> that correct?

It is correct, I did C-x b and typed an x in the minibuffer when the crash 
occurred.  The contents of the minibuffer is two lines.

> 
> Finally, what does the GDB command "pgrow" print?
> 

(gdb) pgrow
TEXT: 80 glyphs
  0    0: CHAR[S] pos=1 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  1    7: CHAR[w] pos=2 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  2   14: CHAR[i] pos=3 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  3   21: CHAR[t] pos=4 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  4   28: CHAR[c] pos=5 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  5   35: CHAR[h] pos=6 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  6   42: CHAR[ ] pos=7 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  7   49: CHAR[t] pos=8 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  8   56: CHAR[o] pos=9 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
  9   63: CHAR[ ] pos=10 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 10   70: CHAR[b] pos=11 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 11   77: CHAR[u] pos=12 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 12   84: CHAR[f] pos=13 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 13   91: CHAR[f] pos=14 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 14   98: CHAR[e] pos=15 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 15  105: CHAR[r] pos=16 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 16  112: CHAR[ ] pos=17 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 17  119: CHAR[(] pos=18 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 18  126: CHAR[d] pos=19 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 19  133: CHAR[e] pos=20 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 20  140: CHAR[f] pos=21 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 21  147: CHAR[a] pos=22 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 22  154: CHAR[u] pos=23 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 23  161: CHAR[l] pos=24 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 24  168: CHAR[t] pos=25 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 25  175: CHAR[ ] pos=26 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 26  182: CHAR[x] pos=27 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 27  189: CHAR[s] pos=28 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 28  196: CHAR[e] pos=29 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 29  203: CHAR[t] pos=30 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 30  210: CHAR[t] pos=31 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 31  217: CHAR[i] pos=32 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 32  224: CHAR[n] pos=33 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 33  231: CHAR[g] pos=34 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 34  238: CHAR[s] pos=35 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 35  245: CHAR[.] pos=36 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 36  252: CHAR[h] pos=37 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 37  259: CHAR[)] pos=38 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 38  266: CHAR[:] pos=39 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 39  273: CHAR[ ] pos=40 blev=0,btyp=UNDEF w=7 a+d=11+3 face=27 MB
 40  280: CHAR[x] pos=41 blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 41  287: CHAR[{] str=175f681[0] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 42  294: CHAR[s] str=175f681[1] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 43  301: CHAR[e] str=175f681[2] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 44  308: CHAR[t] str=175f681[3] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 45  315: CHAR[t] str=175f681[4] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 46  322: CHAR[i] str=175f681[5] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 47  329: CHAR[n] str=175f681[6] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 48  336: CHAR[g] str=175f681[7] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 49  343: CHAR[s] str=175f681[8] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 50  350: CHAR[.] str=175f681[9] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 51  357: CHAR[c] str=175f681[10] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 52  364: CHAR[,] str=175f681[11] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 53  371: CHAR[l] str=175f681[12] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 54  378: CHAR[w] str=175f681[13] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 55  385: CHAR[m] str=175f681[14] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 56  392: CHAR[e] str=175f681[15] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 57  399: CHAR[n] str=175f681[16] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 58  406: CHAR[u] str=175f681[17] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 59  413: CHAR[.] str=175f681[18] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 60  420: CHAR[c] str=175f681[19] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 61  427: CHAR[,] str=175f681[20] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 62  434: CHAR[l] str=175f681[21] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 63  441: CHAR[w] str=175f681[22] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 64  448: CHAR[m] str=175f681[23] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 65  455: CHAR[e] str=175f681[24] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 66  462: CHAR[n] str=175f681[25] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 67  469: CHAR[u] str=175f681[26] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 68  476: CHAR[P] str=175f681[27] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 69  483: CHAR[.] str=175f681[28] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 70  490: CHAR[h] str=175f681[29] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 71  497: CHAR[,] str=175f681[30] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 72  504: CHAR[f] str=175f681[31] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 73  511: CHAR[n] str=175f681[32] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 74  518: CHAR[s] str=175f681[33] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 75  525: CHAR[.] str=175f681[34] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 76  532: CHAR[c] str=175f681[35] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 77  539: CHAR[,] str=175f681[36] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 78  546: CHAR[t] str=175f681[37] blev=0,btyp=UNDEF w=7 a+d=11+3 MB
 79  553: CHAR[e] str=175f681[38] blev=0,btyp=UNDEF w=7 a+d=11+3 MB


> Oh, btw: is this an optimized or an unoptimized build?

Unoptimized.

> 
>> (gdb) p *glyph
>> $3 = {
>>    charpos = 7589819289523352181,
>>    object = 8079492959817000301,
>>    pixel_width = 26991,
>>    ascent = 29806,
>>    descent = 29285,
>>    voffset = 26463,
>>    type = 2,
>>    multibyte_p = 0,
>>    left_box_line_p = 0,
>>    right_box_line_p = 1,
>>    overlaps_vertically_p = 1,
>>    padding_p = 1,
>>    glyph_not_available_p = 0,
>>    avoid_cursor_p = 1,
>>    resolved_level = 16,
>>    bidi_type = 1,
> 
> Hmm?.. looks like a garbled glyph structure...

Indeed.

	Jan D.
This bug report was last modified 15 years and 47 days ago.

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