linux-kernel - Re: [BUG] D state process after unplug and umount usb disk

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Date:	Sun, 4 Sep 2011 21:17:02 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lin Ming <mlin@...pku.edu.cn>
cc:	Dave Young <hidave.darkstar@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<fengguang.wu@...el.com>, <linux-usb@...r.kernel.org>
Subject: Re: [BUG] D state process after unplug and umount usb disk

On Sun, 4 Sep 2011, Lin Ming wrote:

> On Sun, Sep 4, 2011 at 9:49 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> >
> >> Where does this exit signal come from?
> >> Does USB interrupt handler will send kill signal to all processes
> >> accessing it when it's unplugged(by hand)?
> >
> > The USB stack does not send any signals at all unless a process
> > specifically asks for them.
> 
> How to ask?

With the USBDEVFS_DISCSIGNAL ioctl.

> I have not checked, but think umount code path will not send signal to process.

I don't think so either.

Alan Stern

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