bugGNU Screen - Bugs: bug #33225, screen sometimes dies when started...


bug #33225: screen sometimes dies when started through ssh -t

Submitted by:  Cyril Roussillon <cyril42e>
Submitted on:  Tue 03 May 2011 06:02:18 PM UTC  
Category:  Crash/Freeze/Infloop Severity:  3 - Normal
Priority:  5 - Normal Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Release:  4.0.3
Fixed Release:  None Planned Release:  None
Work Required:  None

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Tue 03 May 2011 06:02:18 PM UTC, original submission:

I start commands in screens on distant machines using ssh with -t option, advertised in ssh man to allow the use of screen. It doesn't work at all without this option (the command is blocking). For instance with this command :

ssh -t <machine> "screen -d -m sleep 100"

- sometimes it doesn't seem to create a screen session (nothing with screen -ls),
- sometimes it creates a screen session but which is immediately "Dead",
- sometimes it creates a screen session correctly "Detached", but which never ends (here after 100s it is supposed to end). When trying to attach it it freezes, and ctrl-c makes the screen "Dead" with the message "Suddenly the Dungeon collapses!! - You die...",
-eventually sometimes it just works (creates a "Detached" screen, can attach it, detach it again, etc).

More interesting, on some machines it almost always works, and on some other machines it almost never works, even if they have exactly the same OS and software version, eg:

[~] uname -a
Linux bugsbunny 2.6.18-238.9.1.el5 #1 SMP Tue Apr 12 18:10:13 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
[~] cat /proc/version
Linux version 2.6.18-238.9.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Tue Apr 12 18:10:13 EDT 2011
[~] screen --version
Screen version 4.00.03 (FAU) 23-Oct-06
[~] ssh -v
OpenSSH_5.8p1-hpn13v10, OpenSSL 1.0.0d 8 Feb 2011

I tried with different machines with different OpenSSH versions, from 4.3 to 5.8, in the two directions, and it never worked perfectly. Actually I don't know if this is a bug of ssh, sshd or screen... Of course it is the same with other commands than sleep.

Cyril Roussillon <cyril42e>


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