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

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Message-ID: <Pine.LNX.4.44L0.0908201716190.2422-100000@iolanthe.rowland.org>
Date:	Thu, 20 Aug 2009 17:20:35 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <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 Thu, 20 Aug 2009, Bruno [UTF-8] PrÃ©mont wrote:

> No, that one does not really help (well it avoids dereferencing a bad
> pointer (NULL for pl2302 or invalid for ftdi) with serial_do_free() after
> destroy_serial() but is does underflow module refcount (refcount ends
> up at 2^32-1) and lets the kernel stall/panic a short time later without
> any useful information at that moment (only very first line of trace
> ever appears) [ftdi for the panic/freeze].

More information, please.  Does the problem occur with the pl2303 or 
only with the ftdi?  Which module's refcount underflows?  What else can 
you provide?

I don't see the same sort of thing with my pl2303 device, but maybe
I'm using a different version of minicom.

Alan Stern

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