> Date: Wed, 08 Oct 2014 13:29:52 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 18649 <at> debbugs.gnu.org
>
> > Date: Wed, 08 Oct 2014 11:32:31 +0200
> > From: martin rudalics <rudalics <at> gmx.at>
> > CC: 18649 <at> debbugs.gnu.org
> >
> > > IOW, we throw to top level too early
> > > or too radically.
> >
> > Do you see any way to debug this?
>
> If no other idea presents itself, the hard way: by stepping through
> the code in keyboard.c that processes keyboard input.
There _is_ a better way: set a breakpoint in process_quit_flag (which
is called as part of QUIT), and see who called it. Using this method,
I was able to catch the villain in no time, see below.
> > > Update: the problem is definitely caused by r117587; reverting it
> > > fixes the problem. I reviewed the diffs, more than once, and I cannot
> > > see what could be the reason. Martin, your help will be appreciated.
> >
> > I'm just as lost as you are. I tried to partially revert changes that
> > could have affected this on w32 but with no luck.
>
> Sigh. I guess that commit just exposed some other bug, then.
It wasn't an old bug, it was indeed caused by the pixel-wise changes.
Specifically, the fact that as part of the call to change_frame_size,
we can now call Lisp (in frame_windows_min_size). The other part of
the puzzle is that w32_console_read_socket calls change_frame_size
unconditionally on every event it reads, because Windows doesn't tell
us about resizes of the console window.
So what happened was that we read the C-g key, called
kbd_buffer_store_event for it, which set Vquit_flag, and then we
called change_frame_size, which did QUIT when frame_windows_min_size
called Lisp.
I fixed that by passing a non-zero DELAY argument to
change_frame_size, so that it delays the actual resize to the next
opportunity, like the next redisplay cycle.
I'm closing this bug.
For the record, here's the backtrace I obtained from the breakpoint
set in process_quit_flag:
#0 process_quit_flag () at eval.c:1440
#1 0x0118e71f in Ffuncall (nargs=4, args=0x82e780) at eval.c:2659
#2 0x0118e5bd in call3 (fn=22541890, arg1=22499637, arg2=22425250,
arg3=22425250) at eval.c:2592
#3 0x01010acd in frame_windows_min_size (frame=22499637,
horizontal=22425250, pixelwise=22425250) at frame.c:333
#4 0x01010cce in adjust_frame_size (f=0x1575130 <dumped_data+85776>,
new_width=80, new_height=56, inhibit=5, pretend=false) at frame.c:409
#5 0x0100e9a2 in change_frame_size_1 (f=0x1575130 <dumped_data+85776>,
new_width=80, new_height=56, pretend=false, delay=false, safe=false,
pixelwise=false) at dispnew.c:5531
#6 0x0100ea00 in change_frame_size (f=0x1575130 <dumped_data+85776>,
new_width=80, new_height=56, pretend=false, delay=false, safe=false,
pixelwise=false) at dispnew.c:5562
#7 0x0123c934 in maybe_generate_resize_event () at w32inevt.c:605
#8 0x0123cc99 in w32_console_read_socket (
terminal=0x18fd358 <dumped_data+3789112>, hold_quit=0x82e9ac)
at w32inevt.c:795
#9 0x0110a875 in gobble_input () at keyboard.c:6911
#10 0x01104e33 in kbd_buffer_get_event (kbp=0x82eac4,
used_mouse_menu=0x82ed93, end_time=0x0) at keyboard.c:3957
#11 0x011011f4 in read_event_from_main_queue (end_time=0x0,
local_getcjmp=0x82ebec, used_mouse_menu=0x82ed93) at keyboard.c:2254
#12 0x01101430 in read_decoded_event_from_main_queue (end_time=0x0,
local_getcjmp=0x82ebec, prev_event=22425218, used_mouse_menu=0x82ed93)
at keyboard.c:2319
#13 0x01102886 in read_char (commandflag=0, map=24485206,
prev_event=22425218, used_mouse_menu=0x82ed93, end_time=0x0)
at keyboard.c:2916
#14 0x0110f4cb in read_key_sequence (keybuf=0x82eeb4, bufsize=30,
prompt=19897305, dont_downcase_last=false, can_return_switch_frame=false,
fix_current_buffer=false, prevent_redisplay=false) at keyboard.c:9171
#15 0x01110bf6 in read_key_sequence_vs (prompt=19897305,
continue_echo=22425218, dont_downcase_last=22425218,
can_return_switch_frame=22425218, cmd_loop=22425218, allow_string=true)
at keyboard.c:9865
#16 0x01110cad in Fread_key_sequence (prompt=19897305,
continue_echo=22425218, dont_downcase_last=22425218,
can_return_switch_frame=22425218, cmd_loop=22425218) at keyboard.c:9938
#17 0x0118eaf4 in Ffuncall (nargs=2, args=0x82f014) at eval.c:2739
#18 0x011d05f9 in exec_byte_code (bytestr=19897113, vector=19897141,
maxdepth=16, args_template=22425218, nargs=0, args=0x0) at bytecode.c:920
#19 0x011cfa56 in Fbyte_code (bytestr=19897113, vector=19897141, maxdepth=16)
at bytecode.c:486
#20 0x0118d70c in eval_sub (form=19897102) at eval.c:2184
#21 0x0118cf0e in Feval (form=19897102, lexical=22425218) at eval.c:1993
#22 0x01186634 in Fcall_interactively (function=24528330,
record_flag=22425218, keys=22450893) at callint.c:379
#23 0x0118ea75 in Ffuncall (nargs=4, args=0x82f56c) at eval.c:2730
#24 0x011d05f9 in exec_byte_code (bytestr=19853809, vector=19853829,
maxdepth=52, args_template=4100, nargs=1, args=0x82f8a0) at bytecode.c:920
#25 0x0118f24d in funcall_lambda (fun=19853789, nargs=1, arg_vector=0x82f89c)
at eval.c:2890
#26 0x0118ec5a in Ffuncall (nargs=2, args=0x82f898) at eval.c:2772
#27 0x0118e55d in call1 (fn=22471274, arg1=24528330) at eval.c:2576
#28 0x010ffab9 in command_loop_1 () at keyboard.c:1569
#29 0x0118b976 in internal_condition_case (bfun=0x10ff458 <command_loop_1>,
handlers=22478818, hfun=0x10fecbd <cmd_error>) at eval.c:1344
#30 0x010ff110 in command_loop_2 (ignore=22425218) at keyboard.c:1197
#31 0x0118af11 in internal_catch (tag=22476146,
func=0x10ff0ec <command_loop_2>, arg=22425218) at eval.c:1105
#32 0x010ff0c6 in command_loop () at keyboard.c:1176
#33 0x010fe85a in recursive_edit_1 () at keyboard.c:786
#34 0x010fea16 in Frecursive_edit () at keyboard.c:857
#35 0x010fcafd in main (argc=3, argv=0xa42808) at emacs.c:1643
Lisp Backtrace:
"read-key-sequence" (0x82f018)
"byte-code" (0x82f298)
"call-interactively" (0x82f570)
"command-execute" (0x82f89c)
This bug report was last modified 10 years and 232 days ago.