[Bug 644825] Re: screen unpredictably crashes

[James Reily]

*** This bug is a duplicate of bug 375625 ***
    https://bugs.launchpad.net/bugs/375625

Happened to me twice today. Once while in irssi and the second time in
mutt. I have nethack mode on and have for a long time.

>From dmesg:
[743662.124228] screen[11639]: segfault at 0 ip 000000000040af4d sp 00007fffd6ebec10 error 4 in screen[400000+58000]
[745451.819338] screen[26757] general protection ip:40af4d sp:7fff1e2f1620 error:0 in screen[400000+58000]

fun at morpheus:~$ screen -ls
There are screens on:
        12546.pts-16.morpheus   (06/03/13 13:49:28)     (Attached)
        26757.pts-49.morpheus   (06/03/13 12:57:53)     (Dead ???)
        11639.pts-15.morpheus   (25/02/13 22:23:05)     (Dead ???)
Remove dead screens with 'screen -wipe'.
3 Sockets in /var/run/screen/S-fun.

fun at morpheus:~$ uname -a
Linux morpheus 2.6.32-45-server #104-Ubuntu SMP Tue Feb 19 21:35:01 UTC 2013 x86_64 GNU/Linux

fun at morpheus:~$ screen -v
Screen version 4.00.03jw4 (FAU) 2-May-06

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https://bugs.launchpad.net/bugs/644825

Title:
  screen unpredictably crashes

Status in byobu:
  Invalid
Status in “eglibc” package in Ubuntu:
  Confirmed
Status in “screen” package in Ubuntu:
  Incomplete

Bug description:
  Recently on a wide range of unconnected servers, I've been noticing
  byobu sessions crashing out, with the message "Error: Cannot find
  master process to attach to!" appearing on the console/shell. I have
  not yet noticed any unifying factors; this happens when logged on to
  the physical console as well as over ssh, while the screen is in use
  as well as when it has been idle for a long time.

  byobu 2.68-0ubuntu1.1 and screen 4.0.3-14ubuntu1 are in use in all the
  cases I've seen (i.e. current upgraded Ubuntu 10.04 servers)

  {{{
  $ screen -ls
  There is a screen on:
  	4384.pts-0.leela	(14/09/10 23:55:39)	(Dead ???)
  Remove dead screens with 'screen -wipe'.
  1 Socket in /var/run/screen/S-jim.
  }}}

  I have never noticed this behaviour before, and I've been using
  vanilla screen for a long time; recently I've been switching to byobu
  because I find the on-screen info bars to be useful. For this reason
  I'm listing this bug against byobu, but I cannot prove that.

  Suggestions for increasing debug visibility would be appreciated -- I
  don't want to have to run multi-day sessions under strace, but if
  that's what it takes I can do that on at least one server.

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