linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Message-ID: <20100326124901.GC7039@amit-x200.redhat.com>
Date:	Fri, 26 Mar 2010 18:19:01 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Sachin Sant <sachinp@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, a.p.zijlstra@...llo.nl,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Anton Blanchard <anton@...ba.org>, tglx@...utronix.de,
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...e.hu
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
	hvc_remove

On (Fri) Mar 26 2010 [11:52:33], Alan Cox wrote:
> > >> mount: can't find /root/proc in /etc/fstab or /etc/mtab
> > >> /sbin/smart_agetty: can not determine 'console' speed
> > >>     
> > >
> > > OK, this gets even murkier. I don't know why taking a few krefs modifies
> > > hvc_console behaviour to such an extent.
> 
> Can you see if the agetty is getting a hangup or open failing. I wonder
> if its just a timing change ?

Can someone please try this? Looks like it only reproduces on ppc, I
can't get it to reproduce in my kvm vm. I'm trying to get hold of a ppc
box, though. (btw ppc, ppc64, both should trigger this, right?)

		Amit
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