[Bug 644825] Re: screen unpredictably crashes

[Mark Smith]

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

screen not freezing up nor turning zombie, but i got the error described
above.  it happens reliably.  i just manufactured Ubuntu 14.04.  when
exiting using ^A^D it does exactly what this bug describes.  my screen
is then lost completely (no longer exists), then i get logged out.  the
commands i'm running are:

byobu-screen -d -m -L -a -t amp703 -S amp703 -T xterm-color
byobu-screen -d -r amp703

i then type ^A^D it hangs for about 10 seconds.  it then returns this:

Error: Cannot find master process to attach to!

my PS1 appears as would normally happen after a command completes, but
then i am logged out immediately through no action of my own complete
with the word "logout" as if the ^D part was interpreted by my shell.

sure enough, if i just type ^A by itself within byobu, after 10s it
drops to my shell with the master process error above.

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

Title:
  screen unpredictably crashes

Status in 〣 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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