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* bug#42943: 28.0.50; Emacsclient crashes in ftcrfont_glyph_extents
@ 2020-08-20  0:47 Basil L. Contovounesios
  2020-08-20 14:28 ` Eli Zaretskii
  2020-08-21 14:05 ` Lars Ingebrigtsen
  0 siblings, 2 replies; 19+ messages in thread
From: Basil L. Contovounesios @ 2020-08-20  0:47 UTC (permalink / raw)
  To: 42943

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From the project-root:

0. cd src
1. gdb ./emacs
2. set logging on
3. r -Q --fg-daemon

From the project-root in another shell:

4. ./lib-src/emacsclient -c
5. C-\ arabic RET
6. s ~ A
7. C-x 5 0
8. ./lib-src/emacsclient -c

Back to GDB:

9. bt full

I attach the resulting backtrace.

I then recompiled ftcrfont.c with the following printf sprinkles:


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: printf-debug.diff --]
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diff --git a/src/ftcrfont.c b/src/ftcrfont.c
index 29813c8d7d..7832d4f5ce 100644
--- b/src/ftcrfont.c
+++ a/src/ftcrfont.c
@@ -52,11 +52,19 @@
 
   row = glyph / METRICS_NCOLS_PER_ROW;
   col = glyph % METRICS_NCOLS_PER_ROW;
+  fprintf (stderr, "\nglyph %u row %d col %d nrows %d",
+           glyph, row, col, ftcrfont_info->metrics_nrows);
   if (row >= ftcrfont_info->metrics_nrows)
     {
+      fprintf (stderr, " realloc %p %zu", ftcrfont_info->metrics,
+               sizeof (struct font_metrics *) * (row + 1));
       ftcrfont_info->metrics =
 	xrealloc (ftcrfont_info->metrics,
 		  sizeof (struct font_metrics *) * (row + 1));
+      fprintf (stderr, " memset %p %zu",
+               ftcrfont_info->metrics + ftcrfont_info->metrics_nrows,
+               (sizeof (struct font_metrics *)
+               * (row + 1 - ftcrfont_info->metrics_nrows)));
       memset (ftcrfont_info->metrics + ftcrfont_info->metrics_nrows, 0,
 	      (sizeof (struct font_metrics *)
 	       * (row + 1 - ftcrfont_info->metrics_nrows)));
@@ -68,10 +76,15 @@
       int i;
 
       new = xmalloc (sizeof (struct font_metrics) * METRICS_NCOLS_PER_ROW);
+      fprintf (stderr, " malloc %p %zu", new,
+               sizeof (struct font_metrics) * METRICS_NCOLS_PER_ROW);
       for (i = 0; i < METRICS_NCOLS_PER_ROW; i++)
 	METRICS_SET_STATUS (new + i, METRICS_INVALID);
       ftcrfont_info->metrics[row] = new;
     }
+  fprintf (stderr, " m %p r %p c %p\n", ftcrfont_info->metrics,
+           ftcrfont_info->metrics[row],
+           ftcrfont_info->metrics[row] + col);
   cache = ftcrfont_info->metrics[row] + col;
 
   if (METRICS_STATUS (cache) == METRICS_INVALID)
@@ -503,8 +516,10 @@
     }
 
   glyphs = alloca (sizeof (cairo_glyph_t) * len);
+  fprintf (stderr, "sz %zu len %d", sizeof (cairo_glyph_t), len);
   for (i = 0; i < len; i++)
     {
+      fprintf (stderr, " from %d i %d", from, i);
       glyphs[i].index = s->char2b[from + i];
       glyphs[i].x = x;
       glyphs[i].y = y;

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and repeated the recipe.  IIRC the segfault didn't happen in step 8 the
first time; I had to repeat steps 7-8 a few times before it did, and
this generated a lot of output.  Here are the last few lines:

--8<---------------cut here---------------start------------->8---
glyph 7 row 0 col 7 nrows 1 m 0x5555561a7660 r 0x555556495210 c 0x555556495256

glyph 7 row 0 col 7 nrows 1 m 0x5555561a7660 r 0x555556495210 c 0x555556495256

glyph 63 row 0 col 63 nrows 1 m 0x5555561a7660 r 0x555556495210 c 0x555556495486
sz 24 len 1 from 0 i 0
glyph 3 row 0 col 3 nrows 1 m 0x5555561a7660 r 0x555556495210 c 0x55555649522e
sz 24 len 1 from 0 i 0
glyph 1135 row 8 col 111 nrows 10 m 0x5555562304d0 r 0x2073756c50656d55 c 0x2073756c506571ab
--8<---------------cut here---------------end--------------->8---

IIRC step 8 segfaulted every time after I removed some of the printfs.
Either way, the pattern is always the same: 'glyph' goes from being a
small number to 1135 or 1153, and the address of ftcrfont_info->metrics
changes.

Any ideas?

Thanks,

-- 
Basil

In GNU Emacs 28.0.50 (build 9, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw3d scroll bars)
 of 2020-08-20 built on tabos
Repository revision: f8d3d18168a742691d095a3f0c83512f19621725
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

Configured using:
 'configure 'CC=ccache gcc' 'CFLAGS=-O0 -g3 -ggdb -gdwarf-4'
 --config-cache --prefix=/home/blc/.local --program-suffix=-dbg
 --enable-checking=yes,glyphs --enable-check-lisp-object-type
 --with-x-toolkit=lucid --with-file-notification=yes --with-x'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT
LIBOTF ZLIB TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS
LIBSYSTEMD JSON PDUMPER LCMS2

Important settings:
  value of $LANG: en_IE.UTF-8
  locale-coding-system: utf-8-unix


[-- Attachment #4: gdb.txt --]
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Starting program: /home/blc/.local/src/emacs-dbg/src/emacs -Q --fg-daemon
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff18bf700 (LWP 151164)]
[New Thread 0x7ffff10ad700 (LWP 151217)]
[New Thread 0x7ffff08ac700 (LWP 151218)]

Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x00005555558c001e in ftcrfont_glyph_extents (font=0x5555560ee8d8, glyph=1135, metrics=0x0) at ftcrfont.c:77
77	  if (METRICS_STATUS (cache) == METRICS_INVALID)
#0  0x00005555558c001e in ftcrfont_glyph_extents (font=0x5555560ee8d8, glyph=1135, metrics=0x0) at ftcrfont.c:77
        ftcrfont_info = 0x5555560ee8d8
        row = 8
        col = 111
        cache = 0x3720a1c
#1  0x00005555558c16d6 in ftcrfont_draw (s=0x7fffffffb400, from=0, to=1, x=11, y=1006, with_background=false)
    at ftcrfont.c:511
        f = 0x5555560d8570
        face = 0x5555561a6860
        ftcrfont_info = 0x5555560ee8d8
        cr = 0x5555561b5810
        glyphs = 0x7fffffffaa20
        len = 1
        i = 0
#2  0x00005555556dcd4a in x_draw_composite_glyph_string_foreground (s=0x7fffffffb400) at xterm.c:1969
        gstring = XIL(0x5555560eea1d)
        glyph = XIL(0x555556482de5)
        y = 1006
        width = 9
        i = 1
        j = 0
        x = 11
        font = 0x5555560ee8d8
#3  0x00005555556e08df in x_draw_glyph_string (s=0x7fffffffb400) at xterm.c:3780
        relief_drawn_p = true
#4  0x0000555555625aeb in draw_glyphs
    (w=0x55555656e2d8, x=956, row=0x5555563112a0, area=TEXT_AREA, start=0, end=106, hl=DRAW_NORMAL_TEXT, overlaps=0)
    at xdisp.c:28732
        head = 0x7fffffffb6a0
        tail = 0x7fffffffade0
        s = 0x7fffffffb400
        clip_head = 0x0
        clip_tail = 0x0
        i = 106
        j = -1
        x_reached = 956
        last_x = 955
        area_left = 1
        f = 0x5555560d8570
        sa_avail = 14820
        sa_count = 9
#5  0x000055555562cdd0 in gui_write_glyphs
    (w=0x55555656e2d8, updated_row=0x5555563112a0, start=0x55555636f700, updated_area=TEXT_AREA, len=106)
    at xdisp.c:30750
        x = 61
        hpos = 0
        chpos = 0
#6  0x000055555559dd23 in update_text_area (w=0x55555656e2d8, updated_row=0x5555563112a0, vpos=61) at dispnew.c:3842
        current_row = 0x5555563761a0
        desired_row = 0x5555563112a0
        rif = 0x555555a03200 <x_redisplay_interface>
        changed_p = false
#7  0x000055555559e852 in update_window_line (w=0x55555656e2d8, vpos=61, mouse_face_overwritten_p=0x7fffffffbbe7)
    at dispnew.c:4085
        current_row = 0x5555563761a0
        desired_row = 0x5555563112a0
        rif = 0x555555a03200 <x_redisplay_interface>
        changed_p = false
#8  0x000055555559d0ed in update_window (w=0x55555656e2d8, force_p=true) at dispnew.c:3566
        end = 0x5555563112a0
        mode_line_row = 0x5555563112a0
        header_line_row = 0x0
        changed_p = false
        mouse_face_overwritten_p = false
        row = 0x55555630d5a0
        tab_line_row = 0x0
        yb = 955
        n_updated = 0
        desired_matrix = 0x55555656daf0
        paused_p = false
        preempt_count = 9
        rif = 0x555555a03200 <x_redisplay_interface>
#9  0x000055555559c6d6 in update_window_tree (w=0x55555656e2d8, force_p=true) at dispnew.c:3337
        paused_p = false
#10 0x000055555559c2bd in update_frame (f=0x5555560d8570, force_p=true, inhibit_hairy_id_p=false) at dispnew.c:3226
        paused_p = false
        root_window = 0x55555656e2d8
#11 0x00005555555f5564 in redisplay_internal () at xdisp.c:15868
        gcscrollbars = true
        f_redisplay_flag = true
        f = 0x5555560d8570
        w = 0x55555656e2d8
        sw = 0x55555656e2d8
        fr = 0x5555560d8570
        pending = false
        must_finish = true
        match_p = true
        tlbufpos = {
          charpos = 146,
          bytepos = 146
        }
        tlendpos = {
          charpos = 0,
          bytepos = 0
        }
        number_of_visible_frames = 2
        count = 6
        sf = 0x5555560d8570
        polling_stopped_here = true
        tail = XIL(0x555555f13a33)
        frame = XIL(0x5555560d8575)
        hscroll_retries = 0
        garbaged_frame_retries = 0
        consider_all_windows_p = true
        update_miniwindow_p = true
#12 0x00005555555f6056 in redisplay_preserve_echo_area (from_where=12) at xdisp.c:16137
        count = 5
#13 0x0000555555870357 in wait_reading_process_output
    (time_limit=30, nsecs=0, read_kbd=-1, do_display=true, wait_for_cell=XIL(0), wait_proc=0x0, just_wait_proc=0)
    at process.c:5812
        nread = 3375
        process_skipped = false
        channel = 7
        nfds = 1
        Available = {
          fds_bits = {0 <repeats 16 times>}
        }
        Writeok = {
          fds_bits = {0 <repeats 16 times>}
        }
        check_write = true
        check_delay = 0
        no_avail = false
        xerrno = 11
        proc = XIL(0x55555656e51d)
        timeout = {
          tv_sec = 30,
          tv_nsec = 0
        }
        end_time = {
          tv_sec = 1597883621,
          tv_nsec = 52427752
        }
        timer_delay = {
          tv_sec = 0,
          tv_nsec = -1
        }
        got_output_end_time = {
          tv_sec = 0,
          tv_nsec = -1
        }
        wait = TIMEOUT
        got_some_output = 3375
        prev_wait_proc_nbytes_read = 0
        retry_for_async = false
        count = 4
        now = {
          tv_sec = 0,
          tv_nsec = -1
        }
#14 0x00005555555a4ac8 in sit_for (timeout=make_fixnum(30), reading=true, display_option=1) at dispnew.c:6049
        sec = 30
        nsec = 0
        do_display = true
#15 0x000055555572c886 in read_char
    (commandflag=1, map=XIL(0x555556572ac3), prev_event=XIL(0), used_mouse_menu=0x7fffffffd9ef, end_time=0x0)
    at keyboard.c:2738
        tem0 = XIL(0x7fffffffd6a0)
        timeout = 30
        count1 = 3
        delay_level = 4
        buffer_size = 1
        c = XIL(0)
        jmpcount = 3
        local_getcjmp = {{
            __jmpbuf = {0, -4276096293224735316, 93824992491632, 0, 0, 0, -4276096293535113812, -7927157738208125524},
            __mask_was_saved = 0,
            __saved_mask = {
              __val = {93824995017460, 140737488345088, 0, 140737488345168, 93824995064878, 93825009134259, 3, 93825009134243, 93825001707712, 0, 0, 140737488345168, 0, 93825009134259, 0, 140737488345344}
            }
          }}
        save_jump = {{
            __jmpbuf = {0, 0, 0, 0, 0, 0, 0, 0},
            __mask_was_saved = 0,
            __saved_mask = {
              __val = {0 <repeats 16 times>}
            }
          }}
        tem = XIL(0x2ffffd6d8)
        save = XIL(0x7ffff1c186f8)
        previous_echo_area_message = XIL(0)
        also_record = XIL(0)
        reread = false
        recorded = false
        polling_stopped_here = false
        orig_kboard = 0x555555fa53c0
#16 0x000055555573ed3b in read_key_sequence
    (keybuf=0x7fffffffdb80, prompt=XIL(0), dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9547
        interrupted_kboard = 0x555555fa53c0
        interrupted_frame = 0x555555efeea8
        key = XIL(0x7ffff1c186fd)
        used_mouse_menu = false
        echo_local_start = 0
        last_real_key_start = 0
        keys_local_start = 0
        new_binding = XIL(0x55555589484d)
        count = 3
        t = 0
        echo_start = 0
        keys_start = 0
        current_binding = XIL(0x555556572ac3)
        first_unbound = 31
        mock_input = 0
        used_mouse_menu_history = {false <repeats 30 times>}
        fkey = {
          parent = XIL(0x555555f708b3),
          map = XIL(0x555555f708b3),
          start = 0,
          end = 0
        }
        keytran = {
          parent = XIL(0x7ffff22acc43),
          map = XIL(0x7ffff22acc43),
          start = 0,
          end = 0
        }
        indec = {
          parent = XIL(0x555555f708c3),
          map = XIL(0x555555f708c3),
          start = 0,
          end = 0
        }
        shift_translated = false
        delayed_switch_frame = XIL(0)
        original_uppercase = XIL(0)
        original_uppercase_position = -1
        dummyflag = false
        starting_buffer = 0x7ffff1c186f8
        fake_prefixed_keys = XIL(0)
        first_event = XIL(0)
        second_event = XIL(0)
#17 0x00005555557282e5 in command_loop_1 () at keyboard.c:1350
        cmd = XIL(0x4e60)
        keybuf = 
          {make_fixnum(24), make_fixnum(53), make_fixnum(48), XIL(0x5555557df79c), XIL(0x1f22c1f30), XIL(0x7ffff22c1f30), XIL(0), XIL(0x8250), XIL(0x7fffffffdbf0), XIL(0), XIL(0x555555e5d8c0), XIL(0), XIL(0x7fffffffdc10), XIL(0x5555557fc2a0), make_fixnum(34910567923712), XIL(0), XIL(0x555555e5d8c0), XIL(0), XIL(0x7fffffffdc40), XIL(0x5555557fc2a0), XIL(0), XIL(0x555555e5d8c0), XIL(0), XIL(0), XIL(0x7fffffffdc60), XIL(0x5555557fc2f4), XIL(0x8), XIL(0x8250), XIL(0x7fffffffdca0), make_fixnum(23456248759793)}
        i = 3
        prev_modiff = 38
        prev_buffer = 0x7ffff1c186f8
        already_adjusted = false
#18 0x0000555555801286 in internal_condition_case
    (bfun=0x555555727e69 <command_loop_1>, handlers=XIL(0x90), hfun=0x555555727480 <cmd_error>) at eval.c:1356
        val = XIL(0x5555557245c8)
        c = 0x555555f268e0
#19 0x0000555555727a52 in command_loop_2 (ignore=XIL(0)) at keyboard.c:1091
        val = XIL(0xd5f0)
#20 0x000055555580073a in internal_catch (tag=XIL(0xd5f0), func=0x555555727a25 <command_loop_2>, arg=XIL(0))
    at eval.c:1117
        val = XIL(0)
        c = 0x555555f10c00
#21 0x00005555557279f1 in command_loop () at keyboard.c:1070
#22 0x0000555555726f69 in recursive_edit_1 () at keyboard.c:714
        count = 1
        val = XIL(0x7fffffffde10)
#23 0x0000555555727160 in Frecursive_edit () at keyboard.c:786
        count = 0
        buffer = XIL(0)
#24 0x0000555555723120 in main (argc=3, argv=0x7fffffffe078) at emacs.c:2047
        stack_bottom_variable = 0x7ffff5acd720
        no_loadup = false
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x0
        original_pwd = 0x0
        dump_mode = 0x0
        skip_args = 1
        temacs = 0x0
        attempt_load_pdump = true
        rlim = {
          rlim_cur = 10022912,
          rlim_max = 18446744073709551615
        }
        lc_all = 0x0
        sockfd = -1
        module_assertions = false

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)

^ permalink raw reply related	[flat|nested] 19+ messages in thread
end of thread, other threads:[~2020-10-26 20:13 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-08-20  0:47 bug#42943: 28.0.50; Emacsclient crashes in ftcrfont_glyph_extents Basil L. Contovounesios
2020-08-20 14:28 ` Eli Zaretskii
2020-08-21 14:05 ` Lars Ingebrigtsen
2020-10-22 12:41   ` Lars Ingebrigtsen
2020-10-22 22:11     ` Basil L. Contovounesios
2020-10-24 11:24       ` Robert Pluim
2020-10-24 11:46         ` Eli Zaretskii
2020-10-24 12:14           ` Robert Pluim
2020-10-24 13:10             ` Eli Zaretskii
2020-10-24 13:35               ` Robert Pluim
2020-10-24 13:27             ` Robert Pluim
2020-10-24 14:12               ` Eli Zaretskii
2020-10-24 14:48                 ` Eli Zaretskii
2020-10-24 15:41                   ` Robert Pluim
2020-10-24 15:52                     ` Eli Zaretskii
2020-10-26 12:33                       ` Robert Pluim
2020-10-26 16:16                         ` Eli Zaretskii
2020-10-26 20:13                           ` Basil L. Contovounesios
2020-10-24 15:34                 ` Robert Pluim

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