linux-kernel - Re: 2.6.31-rc5 regression: Oops when USB Serial disconnected while in use

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Message-ID: <20090810181306.GA24989@kroah.com>
Date:	Mon, 10 Aug 2009 11:13:06 -0700
From:	Greg KH <greg@...ah.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.31-rc5 regression: Oops when USB Serial disconnected while
 in use

On Mon, Aug 10, 2009 at 07:18:22PM +0200, Bruno Prémont wrote:
> On Mon, 10 August 2009 Greg KH <greg@...ah.com> wrote:
> > On Mon, Aug 10, 2009 at 11:18:29AM -0400, Alan Stern wrote:
> > > On Sat, 8 Aug 2009, Bruno Prémont wrote:
> > > 
> > > > I tried bisecting this but bisect did end up on a fully unrelated
> > > > commit (which is not even being compiled into my kernel).
> > > > Possibly the failed bisect could be related to mis-classified
> > > > kernel panic/hang while pulling the USB cable (there were two
> > > > such panics for the whole iteration)?
> > > > 
> > > > There are quite a few patches touching tty, ttyUSB and friends
> > > > between rc4 and now so pretty hard to guess on the correct one.
> > > > 
> > > > The oops always happens when I disconnect the USB serial console
> > > > (here the one built into Marvell SheevaPlug) while having minicom
> > > > connected to it.
> > > > During the bisection for the last few bad iterations minicom got
> > > > killed (segfault), the bad ones on the iteration left a minicom
> > > > zombie in 'D' state.

Ok, a few questions.

Are you pulling the device out when you have a console attached to the
device, or just a "normal" minicom connection with it?  I can't seem to
duplicate this here at the moment for some reason :(

thanks,

greg k-h
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