On Thu, Jan 31, 2019 at 3:26 PM Eli Zaretskii wrote: > > OK, so here's a way that could potentially find the culprit: > > $ cd /path/to/emacs/src > $ gdb ./emacs > ... > (gdb) source ./.gdbinit > (gdb) break fill_image_glyph_string > (gdb) run > (gdb) break fill_image_glyph_string Breakpoint 3 at 0x4377e1: file xdisp.c, line 26151. (gdb) run Starting program: /home/kmodi/downloads/git/emacs/src/emacs [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffec3ab700 (LWP 5462)] (emacs:5458): GLib-GIO-CRITICAL **: g_settings_schema_source_lookup: assertion 'source != NULL' failed When this breakpoint breaks, type: > > (gdb) disable > (gdb) print s->f->terminal->image_cache->images[0] > (gdb) watch -l s->f->terminal->image_cache->images[0] if > s->f->terminal->image_cache->images[0] == 0 > (gdb) continue > Thread 1 "emacs" hit Breakpoint 3, fill_image_glyph_string ( s=s@entry=0x7fffffff8f10) at xdisp.c:26151 26151 { (gdb) disable (gdb) print s->f->terminal->image_cache->images[0] $1 = (struct image *) 0x42a70b0 (gdb) watch -l s->f->terminal->image_cache->images[0] if s->f->terminal->image_cache->images[0] == 0 Hardware watchpoint 4: -location s->f->terminal->image_cache->images[0] (gdb) continue Continuing. > Then invoke the rest of your recipe. (It could be that the breakpoint > breaks only after you invoke the last two lines of the recipe.) > warning: Watchpoint condition cannot be tested in the current scope Thread 1 "emacs" hit Hardware watchpoint 4: -location s->f->terminal->image_cache->images[0] Old value = (struct image *) 0x42a70b0 New value = (struct image *) 0x0 free_image (f=f@entry=0x143b260, img=img@entry=0x42a70b0) at image.c:1022 1022 if (img->picture) > Each time the watchpoint breaks, type > > (gdb) bt > (gdb) bt #0 free_image (f=f@entry=0x143b260, img=img@entry=0x42a70b0) at image.c:1022 #1 0x00000000006646a1 in clear_image_cache (f=0x143b260, filter=filter@entry=XIL(0xc5a0)) at image.c:1574 #2 0x000000000066a35d in Fclear_image_cache (filter=...) at image.c:1658 #3 0x00000000005cf848 in funcall_subr (subr=0xceadc0 , numargs=numargs@entry=0, args=args@entry=0x7fffffff0650) at eval.c:2935 #4 0x00000000005cdc27 in Ffuncall (nargs=1, args=args@entry=0x7fffffff0648) at eval.c:2860 #5 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x4d70415), maxdepth=..., maxdepth@entry =make_number(17), args_template=..., args_template@entry=make_number(1024), nargs=nargs@entry=0, args=, args@entry=0x7fffffff0a88) at bytecode.c:633 #6 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x4d70635), nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffff0a88) at eval.c:3058 #7 0x00000000005cdd80 in Ffuncall (nargs=1, args=args@entry=0x7fffffff0a80) at eval.c:2862 #8 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x4ce79c5), maxdepth=..., maxdepth@entry =make_number(7), args_template=..., args_template@entry=make_number(0), nargs=nargs@entry=0, args=, args@entry=0x7fffffff1020) at bytecode.c:633 #9 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x4ce6925), nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffff1020) at eval.c:3058 #10 0x00000000005cdd80 in Ffuncall (nargs=1, args=args@entry=0x7fffffff1018) at eval.c:2862 #11 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., ---Type to continue, or q to quit--- vector@entry=XIL(0x7ffff32d538d), maxdepth=..., maxdepth@entry=make_number(5), args_template=..., args_template@entry=make_number(513), nargs=nargs@entry=2, args=, args@entry=0x7fffffff1308) at bytecode.c:633 #12 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff32d535d), nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffff1308) at eval.c:3058 #13 0x00000000005cdd80 in Ffuncall (nargs=3, args=args@entry=0x7fffffff1300) at eval.c:2862 #14 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff31de765), maxdepth=..., maxdepth@entry=make_number(13), args_template=..., args_template@entry=make_number(256), nargs=nargs@entry=0, args=, args@entry=0x7fffffff17d0) at bytecode.c:633 #15 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff31de735), nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffff17d0) at eval.c:3058 #16 0x00000000005cdd80 in Ffuncall (nargs=1, args=args@entry=0x7fffffff17c8) at eval.c:2862 #17 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x60373e5), maxdepth=..., maxdepth@entry =make_number(16), args_template=..., args_template@entry=make_number(1026), nargs=nargs@entry=4, args=, args@entry=0x7fffffff1bb0) at bytecode.c:633 #18 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x60374e5), nargs=nargs@entry=4, arg_vector=arg_vector@entry=0x7fffffff1bb0) at eval.c:3058 #19 0x00000000005cdd80 in Ffuncall (nargs=5, args=args@entry=0x7fffffff1ba8) at eval.c:2862 ---Type to continue, or q to quit--- #20 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x3e55fd5), maxdepth=..., maxdepth@entry =make_number(18), args_template=..., args_template@entry=make_number(771), nargs=nargs@entry=3, args=, args@entry=0x7fffffff2130) at bytecode.c:633 #21 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x3e55365), nargs=nargs@entry=3, arg_vector=arg_vector@entry=0x7fffffff2130) at eval.c:3058 #22 0x00000000005cdd80 in Ffuncall (nargs=4, args=args@entry=0x7fffffff2128) at eval.c:2862 #23 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x3e549b5), maxdepth=..., maxdepth@entry =make_number(6), args_template=..., args_template@entry=make_number(514), nargs=nargs@entry=2, args=, args@entry=0x7fffffff23f0) at bytecode.c:633 #24 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x3e549d5), nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffff23f0) at eval.c:3058 #25 0x00000000005cdd80 in Ffuncall (nargs=3, args=args@entry=0x7fffffff23e8) at eval.c:2862 #26 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x3e54895), maxdepth=..., maxdepth@entry =make_number(9), args_template=..., args_template@entry=make_number(257), nargs=nargs@entry=1, args=, args@entry=0x7fffffff2788) at bytecode.c:633 #27 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x3e54945), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffff2788) at eval.c:3058 #28 0x00000000005cdd80 in Ffuncall (nargs=2, args=args@entry=0x7fffffff2780) ---Type to continue, or q to quit--- at eval.c:2862 #29 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff323e465), maxdepth=..., maxdepth@entry=make_number(30), args_template=..., args_template@entry=make_number(770), nargs=nargs@entry=3, args=, args@entry=0x7fffffff2d40) at bytecode.c:633 #30 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff323e435), nargs=nargs@entry=3, arg_vector=arg_vector@entry=0x7fffffff2d40) at eval.c:3058 #31 0x00000000005cdd80 in Ffuncall (nargs=4, args=args@entry=0x7fffffff2d38) at eval.c:2862 #32 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff323da15), maxdepth=..., maxdepth@entry=make_number(14), args_template=..., args_template@entry=make_number(771), nargs=nargs@entry=3, args=, args@entry=0x7fffffff30b8) at bytecode.c:633 #33 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff323d9e5), nargs=nargs@entry=3, arg_vector=arg_vector@entry=0x7fffffff30b8) at eval.c:3058 #34 0x00000000005cdd80 in Ffuncall (nargs=4, args=args@entry=0x7fffffff30b0) at eval.c:2862 #35 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff323d94d), maxdepth=..., maxdepth@entry=make_number(7), args_template=..., args_template@entry=make_number(770), nargs=nargs@entry=2, args=, args@entry=0x7fffffff3358) at bytecode.c:633 #36 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff323d91d), nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffff3358) at eval.c:3058 ---Type to continue, or q to quit--- #37 0x00000000005cdd80 in Ffuncall (nargs=3, args=args@entry=0x7fffffff3350) at eval.c:2862 #38 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x1c09dd5), maxdepth=..., maxdepth@entry =make_number(10), args_template=..., args_template@entry=make_number(257), nargs=nargs@entry=1, args=, args@entry=0x7fffffff37a8) at bytecode.c:633 #39 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x1c09e25), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffff37a8) at eval.c:3058 #40 0x00000000005cdd80 in Ffuncall (nargs=2, args=args@entry=0x7fffffff37a0) at eval.c:2862 #41 0x00000000005cdff9 in run_hook_wrapped_funcall (nargs=, args=0x7fffffff37a0) at eval.c:2587 #42 0x00000000005cd341 in run_hook_with_args (nargs=2, args=0x7fffffff37a0, funcall=funcall@entry=0x5cdfdd ) at eval.c:2668 #43 0x00000000005cd4de in Frun_hook_wrapped (nargs=, args=) at eval.c:2602 #44 0x00000000005cf71c in funcall_subr (subr=0xce4ac0 , numargs=numargs@entry=2, args=args@entry=0x7fffffff37a0) at eval.c:2915 #45 0x00000000005cdc27 in Ffuncall (nargs=3, args=args@entry=0x7fffffff3798) at eval.c:2860 #46 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff32e32bd), maxdepth=..., maxdepth@entry=make_number(19), args_template=..., args_template@entry=make_number(514), nargs=nargs@entry=2, args=, args@entry=0x7fffffff3ae0) at bytecode.c:633 #47 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff32e328d), nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffff3ae0) ---Type to continue, or q to quit--- at eval.c:3058 #48 0x00000000005cdd80 in Ffuncall (nargs=3, args=args@entry=0x7fffffff3ad8) at eval.c:2862 #49 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff32e303d), maxdepth=..., maxdepth@entry=make_number(27), args_template=..., args_template@entry=make_number(512), nargs=nargs@entry=2, args=, args@entry=0x7fffffff3ef8) at bytecode.c:633 #50 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff32e300d), nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffff3ef8) at eval.c:3058 #51 0x00000000005cdd80 in Ffuncall (nargs=3, args=args@entry=0x7fffffff3ef0) at eval.c:2862 #52 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff3352f5d), maxdepth=..., maxdepth@entry=make_number(12), args_template=..., args_template@entry=make_number(257), nargs=nargs@entry=1, args=, args@entry=0x7fffffff4248) at bytecode.c:633 #53 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff3352f2d), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffff4248) at eval.c:3058 #54 0x00000000005cdd80 in Ffuncall (nargs=nargs@entry=2, args=args@entry=0x7fffffff4240) at eval.c:2862 #55 0x00000000005ccffa in internal_condition_case_n (bfun=0x5cdaef , nargs=nargs@entry=2, args=args@entry=0x7fffffff4240, handlers=..., handlers@entry=XIL(0xc5a0), hfun=hfun@entry=0x4529d5 ) at eval.c:1456 #56 0x00000000004455e9 in safe__call (inhibit_quit=inhibit_quit@entry=false, nargs=nargs@entry=2, func=XIL(0x7ffff25f1c78), ap=ap@entry =0x7fffffff42b8) ---Type to continue, or q to quit--- at xdisp.c:2644 #57 0x000000000044dd82 in safe_call (nargs=nargs@entry=2, func=...) at xdisp.c:2659 #58 0x000000000044dda3 in safe_call1 (fn=..., fn@entry=XIL(0x7ffff25f1c78), arg=..., arg@entry=make_number(1)) at xdisp.c:2670 #59 0x000000000044e068 in handle_fontified_prop (it=0x7fffffff4520) at xdisp.c:3914 #60 0x0000000000455bc3 in handle_stop (it=it@entry=0x7fffffff4520) at xdisp.c:3480 #61 0x0000000000455c97 in reseat (it=it@entry=0x7fffffff4520, pos=..., force_p=force_p@entry=true) at xdisp.c:6673 #62 0x0000000000456563 in init_iterator (it=it@entry=0x7fffffff4520, w=w@entry=0x4e72520, charpos=1, bytepos=, row=, base_face_id=base_face_id@entry=DEFAULT_FACE_ID) at xdisp.c:3095 #63 0x000000000045e6e1 in start_display (it=it@entry=0x7fffffff4520, w=w@entry=0x4e72520, pos=...) at xdisp.c:3111 #64 0x0000000000466acf in try_window (window=..., window@entry =XIL(0x4e72525), pos=..., flags=flags@entry=1) at xdisp.c:17812 #65 0x000000000047c63b in redisplay_window (window=XIL(0x4e72525), just_this_one_p=just_this_one_p@entry=false) at xdisp.c:17265 #66 0x000000000047e247 in redisplay_window_0 (window=..., window@entry=XIL(0x4e72525)) at xdisp.c:14993 #67 0x00000000005cce92 in internal_condition_case_1 ( bfun=bfun@entry=0x47e218 , arg=..., arg@entry=XIL(0x4e72525), handlers=..., hfun=hfun@entry=0x43b9ba ) at eval.c:1400 #68 0x000000000043d755 in redisplay_windows (window=...) at xdisp.c:14973 #69 0x000000000043d6f6 in redisplay_windows (window=...) at xdisp.c:14967 ---Type to continue, or q to quit--- #70 0x000000000046ce76 in redisplay_internal () at xdisp.c:14443 #71 0x000000000046e493 in redisplay () at xdisp.c:13664 #72 0x000000000054451e in read_char (commandflag=0, map=..., map@entry=XIL(0x47f8093), prev_event=XIL(0x47f8093), used_mouse_menu=used_mouse_menu@entry=0x7fffffff967b, end_time=end_time@entry=0x0) at keyboard.c:2462 #73 0x0000000000545f05 in read_key_sequence (keybuf=keybuf@entry=0x7fffffff9750, prompt=..., prompt@entry=XIL(0x3ada394), dont_downcase_last=, can_return_switch_frame=can_return_switch_frame@entry=false, fix_current_buffer=fix_current_buffer@entry=false, prevent_redisplay=prevent_redisplay@entry=false) at keyboard.c:9082 #74 0x00000000005489be in read_key_sequence_vs (prompt=..., continue_echo=XIL(0), dont_downcase_last=..., can_return_switch_frame=XIL(0), cmd_loop=..., allow_string=allow_string@entry=false) at keyboard.c:9777 #75 0x0000000000548a97 in Fread_key_sequence_vector (prompt=..., continue_echo=..., dont_downcase_last=..., can_return_switch_frame=..., cmd_loop=...) at keyboard.c:9858 #76 0x00000000005cf89c in funcall_subr (subr=0xcdd780 , numargs=numargs@entry=3, args=args@entry=0x7fffffff9970) at eval.c:2947 #77 0x00000000005cdc27 in Ffuncall (nargs=4, args=args@entry=0x7fffffff9968) at eval.c:2860 #78 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff31fe77d), maxdepth=..., maxdepth@entry=make_number(14), args_template=..., args_template@entry=make_number(256), nargs=nargs@entry=1, args=, args@entry=0x7fffffff9ca0) at bytecode.c:633 #79 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff31fe74d), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffff9ca0) at eval.c:3058 #80 0x00000000005cdd80 in Ffuncall (nargs=2, args=args@entry=0x7fffffff9c98) at eval.c:2862 #81 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff319f95d), maxdepth=..., maxdepth@entry=make_number(9), args_template=..., args_template@entry=make_number(257), nargs=nargs@entry=1, args=, args@entry=0x7fffffffa0a0) at bytecode.c:633 #82 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff319f92d), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffa0a0) at eval.c:3058 #83 0x00000000005cdd80 in Ffuncall (nargs=2, args=args@entry=0x7fffffffa098) at eval.c:2862 #84 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x603b905), maxdepth=..., maxdepth@entry=make_number(14), args_template=..., args_template@entry=make_number(0), nargs=nargs@entry=0, args=, args@entry=0x7fffffffa620) at bytecode.c:633 #85 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x603ba45), nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffffa620) at eval.c:3058 #86 0x00000000005cdd80 in Ffuncall (nargs=nargs@entry=1, args=args@entry=0x7fffffffa618) at eval.c:2862 #87 0x00000000005c91cb in Ffuncall_interactively (nargs=1, args=0x7fffffffa618) at callint.c:253 #88 0x00000000005cf71c in funcall_subr (subr=0xce4780 , numargs=numargs@entry=1, args=args@entry=0x7fffffffa618) at eval.c:2915 #89 0x00000000005cdc27 in Ffuncall (nargs=nargs@entry=2, args=args@entry=0x7fffffffa610) at eval.c:2860 #90 0x00000000005ce16c in Fapply (nargs=nargs@entry=3, args=args@entry=0x7fffffffa610) at eval.c:2433 #91 0x00000000005c9a0a in Fcall_interactively (function=..., record_flag=..., keys=...) at callint.c:340 #92 0x00000000005cf86a in funcall_subr (subr=0xce4740 , numargs=numargs@entry=3, args=args@entry=0x7fffffffa750) at eval.c:2940 #93 0x00000000005cdc27 in Ffuncall (nargs=4, args=args@entry=0x7fffffffa748) at eval.c:2860 #94 0x000000000060f0bb in exec_byte_code (bytestr=..., vector=..., vector@entry=XIL(0x7ffff32a25a5), maxdepth=..., maxdepth@entry=make_number(13), args_template=..., args_template@entry=make_number(1025), nargs=nargs@entry=1, args=, args@entry=0x7fffffffaa78) at bytecode.c:633 #95 0x00000000005d0e5b in funcall_lambda (fun=fun@entry=XIL(0x7ffff32a2575), nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffaa78) at eval.c:3058 #96 0x00000000005cdd80 in Ffuncall (nargs=nargs@entry=2, args=args@entry=0x7fffffffaa70) at eval.c:2862 #97 0x00000000005ce041 in call1 (fn=..., fn@entry=XIL(0x4020), arg1=...) at eval.c:2711 #98 0x0000000000547999 in command_loop_1 () at keyboard.c:1462 #99 0x00000000005ccded in internal_condition_case (bfun=bfun@entry=0x5473a3 , handlers=..., handlers@entry=XIL(0x5490), hfun=hfun@entry=0x53c25f ) at eval.c:1376 #100 0x0000000000537c9a in command_loop_2 (ignore=..., ignore@entry=XIL(0)) at keyboard.c:1090 #101 0x00000000005ccd35 in internal_catch (tag=..., func=func@entry=0x537c82 , arg=..., arg@entry=XIL(0)) at eval.c:1139 #102 0x000000000053addd in command_loop () at keyboard.c:1069 #103 0x000000000053bcff in recursive_edit_1 () at keyboard.c:714 #104 0x000000000053c061 in Frecursive_edit () at keyboard.c:785 #105 0x0000000000534efa in main (argc=1, argv=) at emacs.c:1949 Lisp Backtrace: "clear-image-cache" (0xffff0650) "org-display-inline-images" (0xffff0a88) "org-mode" (0xffff1020) "set-auto-mode-0" (0xffff1308) "set-auto-mode" (0xffff17d0) "vc-find-revision-no-save" (0xffff1bb0) ---Type to continue, or q to quit--- "diff-syntax-fontify-hunk" (0xffff2130) "diff-syntax-fontify" (0xffff23f0) "diff--font-lock-syntax" (0xffff2788) "font-lock-fontify-keywords-region" (0xffff2d40) "font-lock-default-fontify-region" (0xffff30b8) "font-lock-fontify-region" (0xffff3358) 0x1c09e20 PVEC_COMPILED "run-hook-wrapped" (0xffff37a0) "jit-lock--run-functions" (0xffff3ae0) "jit-lock-fontify-now" (0xffff3ef8) "jit-lock-function" (0xffff4248) "redisplay_internal (C function)" (0x0) "read-key-sequence-vector" (0xffff9970) "read-key" (0xffff9ca0) "yes-or-no-p" (0xffffa0a0) "vc-revert" (0xffffa620) "funcall-interactively" (0xffffa618) "call-interactively" (0xffffa750) "command-execute" (0xffffaa78) (gdb) continue Continuing. warning: Watchpoint condition cannot be tested in the current scope Thread 1 "emacs" hit Hardware watchpoint 4: -location s->f->terminal->image_cache->images[0] Old value = (struct image *) 0x0 New value = (struct image *) 0x1f089b0 cache_image (f=f@entry=0x143b260, img=img@entry=0x1f089b0) at image.c:2044 2044 img->id = i; The result should include the Lisp backtrace as well. If the "print" > command above shows that images[0] is already NULL, type "bt" right > there and then, before continuing with the rest. > > Each time the watchpoint breaks, type "continue" until the program > segfaults, I want to see all the cases where the image in the cache > gets nullified. > Interestingly, the segfault did not happen when I set that breakpoint and proceeded as you suggested, as you see above. But I killed that gdb session and started again, redid steps to create and crash and got the segfault again: (gdb) r Starting program: /home/kmodi/downloads/git/emacs/src/emacs [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffec3ab700 (LWP 8054)] (emacs:8050): GLib-GIO-CRITICAL **: g_settings_schema_source_lookup: assertion 'source != NULL' failed xdisp.c:26154: Emacs fatal error: assertion failed: s->img Thread 1 "emacs" hit Breakpoint 1, terminate_due_to_signal (sig=sig@entry=6, backtrace_limit=backtrace_limit@entry=2147483647) at emacs.c:370 370 { (gdb) bt #0 terminate_due_to_signal (sig=sig@entry=6, backtrace_limit=backtrace_limit@entry=2147483647) at emacs.c:370 #1 0x00000000005a1622 in die (msg=msg@entry=0x67dc2c "s->img", file=file@entry=0x67dbaa "xdisp.c", line=line@entry=26154) at alloc.c:7453 #2 0x00000000004378fe in fill_image_glyph_string (s=s@entry=0x7fffffff7aa0) at xdisp.c:26154 #3 0x00000000004708cf in draw_glyphs (w=w@entry=0x13fa500, x=44, row=0x3c6a390, area=area@entry=TEXT_AREA, start=, start@entry=0, end=end@entry=6, hl=DRAW_NORMAL_TEXT, overlaps=0) at xdisp.c:26841 #4 0x0000000000474bd2 in x_write_glyphs (w=0x13fa500, updated_row=, start=, updated_area=TEXT_AREA, len=6) at xdisp.c:29042