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

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Date:	Sun, 9 Aug 2009 11:00:29 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
cc:	Bruno Prémont <bonbons@...ux-vserver.org>,
	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 Sun, 9 Aug 2009, [UTF-8] Ozan ÃaÄlayan wrote:

> Bruno PrÃ©mont 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.
> >
> > Regards,
> > Bruno
> >
> >   
> 
> That may be a related/possible fix for that,
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b68f2fb9e73f46037fbeca5fbd4ae8a7ddd8ef6b

That patch is already present in 2.6.31-rc5.

The problem here may be related to the fact that the serial port is
being used as a console.  For non-console ports this doesn't happen.

Alan Stern

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