Package: emacs;
Reported by: "Mark A. Hershberger" <mah <at> everybody.org>
Date: Tue, 14 Feb 2023 21:05:02 UTC
Severity: normal
Found in version 30.0.50
Done: Gregory Heytings <gregory <at> heytings.org>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: mah <at> everybody.org, 61514 <at> debbugs.gnu.org Subject: bug#61514: 30.0.50; sadistically long xml line hangs emacs Date: Mon, 20 Feb 2023 14:41:17 +0200
> Cc: 61514 <at> debbugs.gnu.org
> Date: Sun, 19 Feb 2023 18:38:52 -0500
> From: Stefan Monnier via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>
> > After this, Emacs appears to hang and nothing else is displayed.
>
> That's a second and separate bug (tho probably triggered by the first).
> These tend to be nastier to diagnose.
What happens here that causes the "hang" is clear: the problematic
regexp is used in a looking-at call that is called via
fontification-functions, so its being pathologically slow wedges
redisplay. The backtrace is below:
#2 0x0121ccc0 in re_match_2_internal (bufp=0x19c5a50 <searchbufs+5744>,
string1=0x83207d0 "<id name=\"", 'n' <repeats 4193280 times>, "\">\n",
size1=0,
string2=0x83207d0 "<id name=\"", 'n' <repeats 4193280 times>, "\">\n",
size2=250000, pos=10, regs=0x1870074 <main_thread+116>, stop=250000)
at regex-emacs.c:4581
#3 0x0121b22e in rpl_re_match_2 (bufp=0x19c5a50 <searchbufs+5744>,
string1=0x83207d0 "<id name=\"", 'n' <repeats 4193280 times>, "\">\n",
size1=0,
string2=0x83207d0 "<id name=\"", 'n' <repeats 4193280 times>, "\">\n",
size2=250000, pos=10, regs=0x1870074 <main_thread+116>, stop=250000)
at regex-emacs.c:3861
#4 0x01208bba in looking_at_1 (string=XIL(0x8000000007a39ed8), posix=false,
modify_data=true) at search.c:314
#5 0x01208db4 in Flooking_at (regexp=XIL(0x8000000007a39ed8),
inhibit_modify=XIL(0)) at search.c:350
#6 0x01279aad in funcall_subr (subr=0x187b8c0 <Slooking_at>, numargs=1,
args=0x6c40448) at eval.c:3036
#7 0x012ec2be in exec_byte_code (fun=XIL(0xa000000006c10520),
args_template=769, nargs=2, args=0x6c40458) at bytecode.c:809
#8 0x0127a046 in fetch_and_exec_byte_code (fun=XIL(0xa000000007ea04f8),
args_template=257, nargs=1, args=0x6c401c8) at eval.c:3081
#9 0x0127a5a5 in funcall_lambda (fun=XIL(0xa000000007ea04f8), nargs=1,
arg_vector=0x6c401c8) at eval.c:3153
#10 0x01279512 in funcall_general (fun=XIL(0xa000000007ea04f8), numargs=1,
args=0x6c401c8) at eval.c:2945
#11 0x01279897 in Ffuncall (nargs=2, args=0x6c401c0) at eval.c:2995
#12 0x0127895a in run_hook_wrapped_funcall (nargs=2, args=0x6c401c0)
at eval.c:2773
#13 0x01278e11 in run_hook_with_args (nargs=2, args=0x6c401c0,
funcall=0x1278912 <run_hook_wrapped_funcall>) at eval.c:2854
#14 0x012789a9 in Frun_hook_wrapped (nargs=2, args=0x6c401c0) at eval.c:2788
#15 0x01279ef7 in funcall_subr (subr=0x187ff80 <Srun_hook_wrapped>,
numargs=2, args=0x6c401c0) at eval.c:3059
#16 0x012ec2be in exec_byte_code (fun=XIL(0xa00000000615096c),
args_template=514, nargs=2, args=0x6c400f8) at bytecode.c:809
#17 0x0127a046 in fetch_and_exec_byte_code (fun=XIL(0xa00000000615043c),
args_template=257, nargs=1, args=0x82ac08) at eval.c:3081
#18 0x0127a5a5 in funcall_lambda (fun=XIL(0xa00000000615043c), nargs=1,
arg_vector=0x82ac08) at eval.c:3153
#19 0x01279512 in funcall_general (fun=XIL(0xa00000000615043c), numargs=1,
args=0x82ac08) at eval.c:2945
#20 0x01279897 in Ffuncall (nargs=2, args=0x82ac00) at eval.c:2995
#21 0x0127394d in internal_condition_case_n (bfun=0x127974b <Ffuncall>,
nargs=2, args=0x82ac00, handlers=XIL(0x30),
hfun=0x10428ae <safe_eval_handler>) at eval.c:1558
#22 0x01042ae1 in safe__call (inhibit_quit=false, nargs=2,
func=XIL(0x477df6c), ap=0x82acc4 "") at xdisp.c:3024
#23 0x01042b5a in safe_call (nargs=2, func=XIL(0x477df6c)) at xdisp.c:3039
#24 0x01042bae in safe_call1 (fn=XIL(0x477df6c), arg=make_fixnum(1))
at xdisp.c:3050
#25 0x01046b6a in handle_fontified_prop (it=0x82af58) at xdisp.c:4445
#26 0x0104554e in handle_stop (it=0x82af58) at xdisp.c:3978
#27 0x01052103 in reseat (it=0x82af58, pos=..., force_p=true) at xdisp.c:7509
#28 0x010444d5 in init_iterator (it=0x82af58, w=0x7967568, charpos=1,
bytepos=1, row=0x7adeaf0, base_face_id=DEFAULT_FACE_ID) at xdisp.c:3488
#29 0x0104484d in start_display (it=0x82af58, w=0x7967568, pos=...)
at xdisp.c:3595
#30 0x0107ccaa in try_window (window=XIL(0xa000000007967568), pos=...,
flags=1) at xdisp.c:20568
#31 0x01079885 in redisplay_window (window=XIL(0xa000000007967568),
just_this_one_p=false) at xdisp.c:19960
#32 0x01070924 in redisplay_window_0 (window=XIL(0xa000000007967568))
at xdisp.c:17446
#33 0x0127373a in internal_condition_case_1 (
bfun=0x10708cc <redisplay_window_0>, arg=XIL(0xa000000007967568),
handlers=XIL(0xc00000000648471c), hfun=0x107058e <redisplay_window_error>)
at eval.c:1498
#34 0x01070550 in redisplay_windows (window=XIL(0xa000000007967568))
at xdisp.c:17416
#35 0x0106ed14 in redisplay_internal () at xdisp.c:16866
#36 0x0106c42e in redisplay () at xdisp.c:16049
#37 0x0117570b in read_char (commandflag=1, map=XIL(0xc000000007e4f0f0),
prev_event=XIL(0), used_mouse_menu=0x82f41f, end_time=0x0)
at keyboard.c:2627
#38 0x0118f671 in read_key_sequence (keybuf=0x82f6f8, prompt=XIL(0),
dont_downcase_last=false, can_return_switch_frame=true,
fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:10074
#39 0x01170cf9 in command_loop_1 () at keyboard.c:1375
#40 0x01273650 in internal_condition_case (bfun=0x1170698 <command_loop_1>,
handlers=XIL(0x90), hfun=0x116f666 <cmd_error>) at eval.c:1474
#41 0x01170105 in command_loop_2 (handlers=XIL(0x90)) at keyboard.c:1124
#42 0x012724d7 in internal_catch (tag=XIL(0x10380),
func=0x11700ce <command_loop_2>, arg=XIL(0x90)) at eval.c:1197
#43 0x01170070 in command_loop () at keyboard.c:1102
#44 0x0116f0c6 in recursive_edit_1 () at keyboard.c:711
#45 0x0116f364 in Frecursive_edit () at keyboard.c:794
#46 0x0116a10e in main (argc=2, argv=0xa428e0) at emacs.c:2529
Lisp Backtrace:
"looking-at" (0x6c40448)
"xmltok-scan-attributes" (0x6c403f0)
"xmltok-scan-after-lt" (0x6c403b8)
"xmltok-forward" (0x6c40388)
"nxml-tokenize-forward" (0x6c40350)
"nxml-extend-region" (0x6c40308)
"font-lock-default-fontify-region" (0x6c40298)
"font-lock-fontify-region" (0x6c40230)
0x7ea04f8 PVEC_COMPILED
"run-hook-wrapped" (0x6c401c0)
"jit-lock--run-functions" (0x6c400e8)
"jit-lock-fontify-now" (0x6c40058)
"jit-lock-function" (0x82ac08)
"redisplay_internal (C function)" (0x0)
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