linux-kernel - Re: [2.6.25 on Power5 64bit] badness in fs/sysfs/dir.c:424

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Message-ID: <20081009194033.GJ28224@vanheusden.com>
Date:	Thu, 9 Oct 2008 21:40:34 +0200
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.25 on Power5 64bit] badness in fs/sysfs/dir.c:424

> > While running my modprobe-killerscript I got the following in dmesg:
> 
> Where are your scripts, please?

I've got two versions. The one one intel is:
----------------------------------------------------------------------
#! /usr/bin/perl -w

use POSIX;

@mods = <>;

for(;;)
{
        $n = floor(rand(@mods));

        print $mods[$n]."\n";
        if (rand(2) < 1.0)
        {
                system('rmmod ' . $mods[$n]);
        }
        else
        {
                system('modprobe ' . $mods[$n]);
        }
}
----------------------------------------------------------------------
invoked as:
lsmod | awk '{ print $1; }' | ./pyk-perl.mod


The script I used on the power5-platform is:
----------------------------------------------------------------------
#! /usr/bin/perl -w

use POSIX;

@mods = <>;

fork();
fork();

srand(time() ^ getpid() ^ getppid());

for(;;)
{
        $n = floor(rand(@mods));

        print $mods[$n]."\n";
        if (rand(2) < 1.0)
        {
                system('rmmod ' . $mods[$n]);
        }
        else
        {
                system('modprobe ' . $mods[$n]);
        }
}
----------------------------------------------------------------------
invoked as:
lsmod | grep -v -e ibmveth -v -e windfarm_cpufreq_clamp | awk '{ print $1; }' | ./pyk-perl.mod

I'm removing ibmveth from the list or else I would loose connection
during tests and windfarm_cpufreq_clamp because the script would hang
during a modprobe on that. Maybe something to investigate later.


Folkert van Heusden

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