[Texmacs-dev] segfault caused by undo-history

[Norbert Nemec]

Hi there,

I experience a reproducible segfault that seems to be linked to the recently 
changed history management:

Type:
[backslash] [A] [A] [return]
---> works fine
[backslash] [x] [backspace] [A] [A] [return]
---> CRASH !!!

Seems like activating a hybrid works breaks when the history of entering its 
content is more complex than just a plain sequence of letters.

Unfortunately, I do not understand the new history code well enough to debug 
this any further from here... :-(

Greetings,
Norbert

------

Here is a backtrace starting from hitting the [return] key.


#0  0x00000000004214e0 in tree::tree(tree const&) ()
#1  0x000000000069f494 in clean_remove (t=..., p=..., nr=1) at 
./Kernel/Types/modification.cpp:257
#2  0x000000000069f4b7 in clean_remove (t=..., p=..., nr=1) at 
./Kernel/Types/modification.cpp:257
#3  0x000000000069f4b7 in clean_remove (t=..., p=..., nr=1) at 
./Kernel/Types/modification.cpp:257
#4  0x00000000006a1472 in clean_apply (t=..., mod=...) at 
./Kernel/Types/modification.cpp:387
#5  0x00000000006e7baa in clean_apply (p=..., t=...) at 
./Data/History/patch.cpp:286
#6  0x00000000006ea003 in join (p1=..., p2=..., t=...) at 
./Data/History/patch.cpp:504
#7  0x00000000006e9cd7 in join (p1=..., p2=..., t=...) at 
./Data/History/patch.cpp:492
#8  0x000000000042dd16 in archiver_rep::simplify (this=0x1fc8e90) at 
./Data/History/archiver.cpp:368
#9  0x000000000042f874 in archiver_rep::mark_end (this=0x1fc8e90, m=5.5) at 
./Data/History/archiver.cpp:531
#10 0x000000000053d9e2 in edit_modify_rep::mark_end (this=0x1da0b18, a=5.5) at 
./Edit/Modify/edit_modify.cpp:256
#11 0x0000000000530bdb in edit_interface_rep::interrupt_shortcut 
(this=0x1da0928) at ./Edit/Interface/edit_keyboard.cpp:74
#12 0x0000000000531b83 in edit_interface_rep::key_press (this=0x1da0928, 
key=...) at ./Edit/Interface/edit_keyboard.cpp:151
#13 0x0000000000531f30 in edit_interface_rep::emulate_keyboard (this=0x1da0928, 
keys=..., action=...) at ./Edit/Interface/edit_keyboard.cpp:172
#14 0x00000000006161f0 in tmg_emulate_keyboard (arg1=0x7f8288ee6fa0) at 
Guile/Glue/glue_editor.cpp:1385
#15 0x00007f828dfcea02 in ?? () from /usr/lib/libguile.so.17
#16 0x00007f828dfcc8d8 in scm_dapply () from /usr/lib/libguile.so.17
#17 0x00000000005c4583 in TeXmacs_call (args=0x7fffca697af0) at 
./Guile/Scheme/evaluate.cpp:161
#18 0x00007f828e0213d6 in scm_c_with_throw_handler () from 
/usr/lib/libguile.so.17
#19 0x00000000005c46d7 in TeXmacs_lazy_call_scm (args=0x7fffca697af0) at 
./Guile/Scheme/evaluate.cpp:181
#20 0x00007f828e0216fd in scm_c_catch () from /usr/lib/libguile.so.17
#21 0x00007f828e021964 in scm_internal_catch () from /usr/lib/libguile.so.17
#22 0x00000000005c4707 in TeXmacs_call_scm (args=0x7fffca697af0) at 
./Guile/Scheme/evaluate.cpp:188
#23 0x00000000005c4749 in call_scheme (fun=0x7f8288c5b870) at 
./Guile/Scheme/evaluate.cpp:194
#24 0x00000000006a75a6 in object_command_rep::apply() ()
#25 0x0000000000476307 in command::operator()() ()
#26 0x000000000051889c in edit_dynamic_rep::activate_latex (this=0x1da0b58) at 
./Edit/Modify/edit_dynamic.cpp:497
#27 0x0000000000518b1a in edit_dynamic_rep::activate_hybrid (this=0x1da0b58, 
with_args_hint=false) at ./Edit/Modify/edit_dynamic.cpp:509
#28 0x00000000006110ab in tmg_activate_hybrid (arg1=0x4) at 
Guile/Glue/glue_editor.cpp:411
#29 0x00007f828dfcea02 in ?? () from /usr/lib/libguile.so.17
#30 0x00007f828dfcc8d8 in scm_dapply () from /usr/lib/libguile.so.17
#31 0x00000000005c4583 in TeXmacs_call (args=0x7fffca698620) at 
./Guile/Scheme/evaluate.cpp:161
#32 0x00007f828e0213d6 in scm_c_with_throw_handler () from 
/usr/lib/libguile.so.17
#33 0x00000000005c46d7 in TeXmacs_lazy_call_scm (args=0x7fffca698620) at 
./Guile/Scheme/evaluate.cpp:181
#34 0x00007f828e0216fd in scm_c_catch () from /usr/lib/libguile.so.17
#35 0x00007f828e021964 in scm_internal_catch () from /usr/lib/libguile.so.17
#36 0x00000000005c4707 in TeXmacs_call_scm (args=0x7fffca698620) at 
./Guile/Scheme/evaluate.cpp:188
#37 0x00000000005c4749 in call_scheme (fun=0x7f82834c9100) at 
./Guile/Scheme/evaluate.cpp:194
#38 0x00000000006a75a6 in object_command_rep::apply() ()
#39 0x0000000000476307 in command::operator()() ()
#40 0x0000000000531260 in edit_interface_rep::try_shortcut (this=0x1da0928, 
comb=...) at ./Edit/Interface/edit_keyboard.cpp:103
#41 0x0000000000531afe in edit_interface_rep::key_press (this=0x1da0928, 
key=...) at ./Edit/Interface/edit_keyboard.cpp:149
#42 0x0000000000532267 in edit_interface_rep::handle_keypress (this=0x1da0928, 
key=..., t=10775) at ./Edit/Interface/edit_keyboard.cpp:190
#43 0x0000000000708f72 in process_event (ev=<value optimised out>) at 
./Plugins/Qt/qt_gui.cpp:485
#44 0x000000000070934a in qt_gui_rep::process_queued_events (this=<value 
optimised out>, max=1) at ./Plugins/Qt/qt_gui.cpp:561
#45 0x0000000000709564 in qt_gui_rep::update (this=0x19b5998) at 
./Plugins/Qt/qt_gui.cpp:712
#46 0x00000000007098aa in add_event (ev=<value optimised out>) at 
./Plugins/Qt/qt_gui.cpp:590
#47 0x0000000000709e4a in qt_gui_rep::process_keypress (this=<value optimised 
out>, wid=<value optimised out>, key=<value optimised out>, t=<value optimised 
out>)

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