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bug#7149: Emacs 23.2.1: exiting last `emacsclient -c' frame, and then re

From: Chen Levy
Subject: bug#7149: Emacs 23.2.1: exiting last `emacsclient -c' frame, and then rerun client, segfaults `emacs --daemon'
Date: Sat, 2 Oct 2010 15:12:56 +0200


When starting emacs server with `emacs --daemon', and connecting to it with `emacsclient -c', then closing the last `emacsclient -c' frame and trying to open a new `emacsclient -c' frame, the `emacs --daemon' process receive SYSSEGV.

Steps to reproduce:

0. Make sure no Emacs processes are running.

1. Run: emacs --daemon
  It prints:
  Starting Emacs daemon.

  and the process starts normally.

2. Run: emacsclient -c
  It prints: Waiting for Emacs...
  and a new frame opens as expected.

3. Close the frame, started on strep 2.
  Observe that the `/tmp/emacs${UID}/server' socket seem to be active. 
  `fuser' on it prints the `emacs --daemon' PID.

4. (optional) Open `gdb', `attach' to the `emacs --daemon' process, and `continue' it.

5. Run: emacsclient -c
  It prints: Waiting for Emacs...
  but no new frame is opened.

  gdb prints something like:
  Program received signal SIGSEGV, Segmentation fault.
  0x00007f989f211527 in kill () from /lib/libc.so.6

  And the output of `fuser /tmp/emacs${UID}/server' confirms that the socket is stale.

6. Run: `emacsclient -c' prints:
  emacsclient: connect: Connection refused
  emacsclient: No socket or alternate editor.  Please use:

          --server-file      (or environment variable EMACS_SERVER_FILE)
          --alternate-editor (or environment variable ALTERNATE_EDITOR)

Version information:

# (version)
GNU Emacs 23.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.12.9)
(compiled from source)

# uname -a
Linux xxxxxx 2.6.24-28-generic #1 SMP Thu Sep 16 14:18:43 UTC 2010 x86_64 GNU/Linux

# cat /etc/lsb-release

See also:


| Cheers,
| Chen.

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