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

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Date:	Mon, 10 Aug 2009 11:18:29 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
cc:	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 Sat, 8 Aug 2009, Bruno [UTF-8] 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.

By the way, there are quite a few serial patches in Greg KH's tree.  At 
least one of them looks like it is meant to fix exactly this problem.

Can you try running with

http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-all-2.6.31-rc5.patch

applied to the standard 2.6.31-rc5 source?

Alan Stern

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