If I downgrade tmux from 2.5-3 to 2.3-4 (the version in Ubuntu 17.04),
then byobu does not ever get killed after detaching.
It looks like the bug is in how tmux runs the status line script,
/usr/bin/byobu-status. If byobu-status takes long time to finish, then even my
"good" computer becomes affected by the bug. For example, with following line
placed at the beginning of byobu-status
seq 10000000 | awk '{i=i+$0} END {print i}'
byobu is a lot more likely to be killed after detaching.
In tmux 2.5-3, the status line is reloaded every time a session is
reattached as you can see the status line says "byobu-status not ready"
at the beginning. But in tmux 2.3-4, the status line is NOT reloaded.
This difference might be a useful clue to solve the problem.
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https://bugs.launchpad.net/bugs/1734811
Title:
Detaching session sometimes kills the session
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