Subject: Re: console lost to Ctrl+Alt+F$n in 2.6.0-test5
From: Pat LaVarre <p.lavarre@ieee.org>
To: mhf@linuxmail.org
Cc: mpm@selenic.com, linux-kernel@vger.kernel.org
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Date: 13 Sep 2003 17:12:30 -0600
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> script ... switches every $wait (5) seconds between VT
> $vt (1) and X @vt$x (7) ...

Yes, logging in via ssh to run this script does reliably crash my
2.6.0-test5, I think because of `chvt $x`, while I am not touching the
console keyboard or mouse.

Cycles required varies.  Counting cycles completed before crashing, I
saw: 1 18 20 20 ... 4 16 ...

The script as was posted creates a small ./X and produces logs such as:

Cycle 1 switching to VT 1
Cycle 1 switching to X
...
Cycle 20 switching to VT 1
Cycle 20 switching to X
Cycle 21 switching to VT 1

This log could have been produced by crashing in `chvt $vt`, but I think
I saw it was produced by crashing in the `sleep $wait` that follows
`chvt $x`.  That is, I think the $vt was the last non-blank display, not
the $x.

To increase my confidence, I ran with every command echoed, and indeed
via ssh I saw the last command echoed was `sleep 5`.

I ended by running the third variant script quoted below.  Now my logs
comfortingly end with 'switching to X'.  I presume I'm catching the
crash in the last sleep $wait.

Pat LaVarre

#!/bin/bash
cycle=1
log=/tmp/_vt.log
vt=1
x=7
wait=3
rm -f $log
echo 'Starting VT <> X test'
while ((1)); do
	echo Cycle $cycle switching to VT $vt | tee -a $log
	sync
	sleep $wait
	chvt $vt
	sleep $wait
	echo Cycle $cycle switching to X | tee -a $log
	sync
	sleep $wait
	chvt $x
	sleep $wait
	((cycle += 1))
done
;;


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