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bug#22739: 25.0.50; Hangs on revertig buffer

From: Eli Zaretskii
Subject: bug#22739: 25.0.50; Hangs on revertig buffer
Date: Fri, 19 Feb 2016 17:45:58 +0200

> From: Óscar Fuentes <address@hidden>
> Cc: address@hidden
> Date: Fri, 19 Feb 2016 14:21:48 +0100
> move_it_vertically_backward (address@hidden, address@hidden)
>     at ../../emacs/src/xdisp.c:9489
> 9489                   && SREF (it2.string, IT_STRING_BYTEPOS (it2) - 1) == 
> '\n')));
> Value returned is $6 = 812
> (gdb) 
> Run till exit from #0  move_it_vertically_backward (address@hidden, 
>     address@hidden) at ../../emacs/src/xdisp.c:9489
> 0x000000000054ae08 in internal_condition_case (
>     address@hidden <command_loop_1>, address@hidden, 
>     address@hidden <cmd_error>) at ../../emacs/src/eval.c:1300
> 1300      if (sys_setjmp (c->jmp))
> (gdb) 

This seems to say that the display engine signaled an error.  If so,
the error message should be in *Messages*.  One way of accessing the
error messages is to use the facilities in etc/emacs-buffer.gdb (after
you instruct GDB to load that file with the "source" command) to
access the text of *Messages*.  An alternative is to put a breakpoint
in Fsignal, and look at the error symbol and data when the breakpoint
breaks, using the commands in src/.gdbinit that display Lisp objects.
(But do NOT use "pp", because it invokes a function inside Emacs.)

Can you do any of these?  If you need more detailed instructions, just


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