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bug#22739: 25.0.50; Hangs on revertig buffer
From: |
Óscar Fuentes |
Subject: |
bug#22739: 25.0.50; Hangs on revertig buffer |
Date: |
Fri, 19 Feb 2016 23:09:02 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
> 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*.
After using ybuffer-save for recovering *Messages*, the last lines are
reverting...
reverted
Quit
The "reverting... reverted" lines are the output of a wrapper function I
wrote for executing revert-buffer:
(defun ofv-revert-buffer ()
(interactive)
(message "reverting...")
(revert-buffer nil (not (buffer-modified-p)))
(message "reverted"))
It is interesting that the last line of *Messages* is "Quit", but the
minibuffer on the frozen Emacs session shows "reverted". From where
comes "Quit"? Why it was not displayed? When Emacs froze, I tried C-g,
but that was after a few seconds.
> 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.)
I'm afraid that the Emacs instance is not resumable anymore. After using
the "finish" trick on the previous message, I was unable to interrup
Emacs either with C-c on the gdb console (as I did the first time after
attaching gdb) nor C-z on the Emacs window (as DEBUG suggests.) I sent a
SIGSTOP signal to the Emacs process to gain access to the gdb command
line and now it can't resume.