linux-ext4 - Re: tests: kill debugfs on interrupted MMP test

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Message-ID: <20120917020333.GC15224@thunk.org>
Date:	Sun, 16 Sep 2012 22:03:33 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: tests: kill debugfs on interrupted MMP test

On Sun, Sep 16, 2012 at 09:12:06PM -0400, Theodore Ts'o wrote:
> On Mon, Sep 10, 2012 at 09:04:47AM -0000, Andreas Dilger wrote:
> > If the f_mmp test is interrupted during its test run, then it can
> > leave debugfs busy-looping in the background.  Since f_mmp is a
> > relatively long-running test, and is likely to be running during
> > a parallel test run, this can happen fairly often.
> > 
> > Set a signal trap for the f_mmp test script being killed, so that
> > the background debugfs command will always be killed by the test.
> > 
> > Signed-off-by: Andreas Dilger <adilger@...ger.ca>
> 
> Thanks, applied.

Oops, I'm going to guess you didn't test your patch after making a
last minute change to it.  I had to make the following change to the
f_mmp script to fix a problem where kill would complain about a
non-existing process id (because it was triyng to kill the already
exited awk process):

diff --git a/tests/f_mmp/script b/tests/f_mmp/script
index c1f13fc..d921672 100644
--- a/tests/f_mmp/script
+++ b/tests/f_mmp/script
@@ -21,8 +21,8 @@ fi
 
 kill_debugfs() {
 	trap 0
-	PID=$(ps -o pid,command | awk "/debugfs -w $TMPFILE/ { print \$1 }" |
-	      grep -v awk)
+	PID=$(ps -o pid,command | grep -v awk |
+		awk "/debugfs -w $TMPFILE/ { print \$1 }")
 	[ "x$PID" != "x" ] && kill -9 $PID
 }
 

						- Ted
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