linux-kernel - Re: netconsole module cannot be removed

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Message-ID: <20070226214229.GA9797@redhat.com>
Date:	Mon, 26 Feb 2007 16:42:29 -0500
From:	Dave Jones <davej@...hat.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: netconsole module cannot be removed

On Mon, Feb 26, 2007 at 01:31:56PM -0800, Stephen Hemminger wrote:
 > On Mon, 26 Feb 2007 15:35:11 -0500
 > Chuck Ebbert <cebbert@...hat.com> wrote:
 > 
 > > Trying to remove netconsole, rmmod goes into a tight loop with
 > > 100% CPU usage. It can't be killed with 'kill -9'. Shutdown
 > > works, though. Kernel is 2.6.20 FC6 config, and I'm 99.9%
 > > sure the module signing has nothing to do with this.
 > > 
 > 
 > No it probably has to do with printing a message during module removal.

I just reproduced this, and something really spooky happened.
After echo t > /proc/sysrq-trigger, the 'rmmod' process doesn't
show up in the backtrace. Everything else is there though.
The process shows up in a regular 'ps', but not in the sysrq output.

Most bizarre.

		Dave

-- 
http://www.codemonkey.org.uk
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