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[screen-devel] [bug #42178] byobu >= 5.77 crashes screen server process

From: Axel Beckert
Subject: [screen-devel] [bug #42178] byobu >= 5.77 crashes screen server process on pressing Ctrl-A c
Date: Wed, 23 Apr 2014 15:58:19 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20140319 conkeror/1.0pre (Debian-1.0~~pre+git120527-1+deb7u1)


                 Summary: byobu >= 5.77 crashes screen server process on
pressing Ctrl-A c
                 Project: GNU Screen
            Submitted by: abe
            Submitted on: Mi 23 Apr 2014 15:58:18 GMT
                Category: Crash/Freeze/Infloop
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Cur Dev Sources
           Fixed Release: None
         Planned Release: None
           Work Required: None



Initially reported in Ubuntu at and also tracked
in Debian at

See for more information about byobu, a screen and tmux
wrapper. To reproduce at least byobu 5.77 is needed. 5.70 and lower versions
are known to not trigger this issue.

The server processs of a GNU Screen session can be crashed by

1. rm -rf ~/.byobu
2. calling byobu-screen
3. pressing Ctrl-A to get byobu's Ctrl-A behaviour menu
4. choosing "screen behaviour"
5. pressing Ctrl-A c (some other Ctrl-A sequences work also)

Reproducible with the following versions of GNU Screen:

* 4.2.0 (as patched in Debian tbh.)
* commit db59704 (of 2012, as currently in Debian Stable)
* current HEAD of the screen-v4 branch (commit fe8103c) without any further
patches (just autoreconf + configure + make)

I haven't yet found a minimal .screenrc which triggers this issue without
calling byobu first. But since there's a crash involved, it can't be byobu's
fault alone...


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