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

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Message-ID: <CAF1ivSaFt9ZBsM4s7NyjJWz6QBE7xcS21bXGADp4NPp=2XcYEA@mail.gmail.com>
Date:	Sun, 4 Sep 2011 22:25:40 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Alan Stern <stern@...land.harvard.edu>
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, 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?

I have not checked, but think umount code path will not send signal to process.
Curiously, where does the exit signal come from?

Dave,
Did you press "Ctrl + C" on cat?

Lin Ming
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