[Octave-bug-tracker] [bug #63752] experimental-terminal-widget crashes Octave

[Pantxo Diribarne]

Follow-up Comment #4, bug #63752 (project octave):

This could be a threading issue. I am running Octave on a 10 years old machine
so it may be slow as compared to yours.

Here are more details. I attached a back-trace of the crash. It seams to
happen in QScintilla code:


#0  __pthread_kill_implementation (no_tid=0, signo=6,
threadid=140737116863488) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=140737116863488) at
./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=140737116863488, signo=signo@entry=6) at
./nptl/pthread_kill.c:89
#3  0x00007ffff50a7476 in __GI_raise (sig=sig@entry=6) at
../sysdeps/posix/raise.c:26
#4  0x00007ffff508d7f3 in __GI_abort () at ./stdlib/abort.c:79
#5  0x00007ffff50ee6f6 in __libc_message (action=action@entry=do_abort,
fmt=fmt@entry=0x7ffff5240b8c "%s\n") at ../sysdeps/posix/libc_fatal.c:155
#6  0x00007ffff5105d7c in malloc_printerr (str=str@entry=0x7ffff523e764
"free(): invalid pointer") at ./malloc/malloc.c:5664
#7  0x00007ffff5107ac4 in _int_free (av=<optimized out>, p=<optimized out>,
have_lock=0) at ./malloc/malloc.c:4439
#8  0x00007ffff510a4d3 in __GI___libc_free (mem=<optimized out>) at
./malloc/malloc.c:3391
#9  0x00007ffff4aee01f in
QsciAccessibleScintillaBase::textRange(QsciScintillaBase*, int, int) () at
/lib/libqscintilla2_qt5.so.15
#10 0x00007ffff4aef3ca in QsciAccessibleScintillaBase::characterRect(int)
const () at /lib/libqscintilla2_qt5.so.15
...


That made me suspect that the following change (that I think has happened
after the last time I tested the new terminal widget):


changeset:   31080:56ee6a223c51
user:        Torsten Lilge <ttl-octave@mailbox.org>
date:        Tue Jun 07 23:03:11 2022 +0200
summary:     use QScintilla instead of QTextEdit for new terminal widget


If I update to -r 31079 I can't trigger the crash anymore. From 31080 on, I
can reliably trigger the crash by simply typing 4 characters. E.g., if I type
"plot", after typing "t" the GUI window disappears and the message from
comment #0 appears in the calling terminal.


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