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Startup/exit race condition

From: Michael Renner
Subject: Startup/exit race condition
Date: Wed, 31 Mar 2004 03:22:37 +0200 (CEST)


I'm reporting this here since there seems to be no official/public form of
bugtracking (bugzilla or something the like):

There seems to be a race condition when starting (a detached) screen from
within a screen which is about to exit, causing the newly started screen
to terminate.

This was verified with a simple three-liner shellscript:


sleep 5
screen -d -m $0


after a while (between 2 and 30 loops) of happy screen-respawning the
about-to-start screen fails. I haven't found a good way to debug this,
since strace doesn't seem to be able to follow the exec'ed processes when
the parent process exits. Putting a "sleep 1" after the screen call
(giving the new process enough time to start up?) fixes this problem.

This was tested on an "old" (Athlon 1Ghz) computer with a fairly loaded fs
(software raid5, vmstat showing a constant read of 1-3mb/sec), so if this
bug is related to the creation/deletion of socket files it could be hard
to reproduce on other computers. Version used is the one which is
currently in debian-tesing, reporting itself as "4.00.02 (FAU) 5-Dec-03",
OS/kernel is linux 2.6.4.

best regards,

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