linux-kernel - Re: scheduling while atomic & hang.

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Message-ID: <51D5BA25.9060207@zytor.com>
Date:	Thu, 04 Jul 2013 11:08:37 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: scheduling while atomic & hang.

On 07/03/2013 07:49 PM, Linus Torvalds wrote:
>>  [<ffffffff816f42bf>] __schedule+0x94f/0x9c0
>>  [<ffffffff816f487e>] schedule_user+0x2e/0x70
>>  [<ffffffff816f6de4>] retint_careful+0x12/0x2e

This call trace does indeed indicate that we took a hardware interrupt 
which caused a reschedule.  It doesn't necessarily have to be a quantum 
expiration interrupt, it could just as easily be an I/O completion 
interrupt.

	-hpa

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