On Fri, Apr 26, 2019 at 3:05 PM Eli Zaretskii wrote: > > So the window's start point is outdated. How did that happen? What > kind of stuff do you have on window-scroll-functions? This should > show us: > > (gdb) pp Vwindow_scroll_functions > Seems like that caused gdb to crash again? (gdb) pp Vwindow_scroll_functions xdisp.c:3047: Emacs fatal error: assertion failed: charpos == BYTE_TO_CHAR (bytepos) Thread 1 "emacs" hit Breakpoint 1, terminate_due_to_signal (sig=sig@entry=6, backtrace_limit=backtrace_limit@entry=2147483647) at emacs.c:375 375 { The program being debugged stopped while in a function called from GDB. Evaluation of the expression containing the function (safe_debug_print) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) But from an uncrashed emacs, with beacon loaded as before, C-h v window-scroll-functions gives ... (beacon--window-scroll-function) beacon--window-scroll-function: http://git.savannah.gnu.org/cgit/emacs/elpa.git/tree/packages/beacon/beacon.el#n425 > Also, what buffer does the window-start marker record? > > (gdb) fr 2 > (gdb) p w->start > (gdb) xmarker > (gdb) p $->buffer->name_ > (gdb) xstring > (gdb) pp Vwindow_scroll_functions xdisp.c:3047: Emacs fatal error: assertion failed: charpos == BYTE_TO_CHAR (bytepos) Thread 1 "emacs" hit Breakpoint 1, terminate_due_to_signal (sig=sig@entry=6, backtrace_limit=backtrace_limit@entry=2147483647) at emacs.c:375 375 { The program being debugged stopped while in a function called from GDB. Evaluation of the expression containing the function (safe_debug_print) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) fr 2 #2 0x0000000000456b44 in init_iterator (it=it@entry=0x7ffffffef990, w=w@entry=0x89da880, charpos=2874, bytepos=, row=, base_face_id=base_face_id@entry=DEFAULT_FACE_ID) at xdisp.c:3047 3047 eassert (charpos == BYTE_TO_CHAR (bytepos)); (gdb) p w->start $16 = XIL(0x89daa95) (gdb) xmarker $17 = (struct Lisp_Marker *) 0x89daa90 (gdb) p $->buffer->name_ $18 = XIL(0x7960234) (gdb) xstring $19 = (struct Lisp_String *) 0x7960230 "standard-reading.org" (gdb) That "standard-reading.org" is the Org file whose ~3000 character snippet that I linked earlier.