linux-kernel - Re: [tip:sched/locking] sched: Add p->pi_lock to task_rq

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Message-ID: <4DE8DC28.30709@die-jansens.de>
Date:	Fri, 03 Jun 2011 15:05:44 +0200
From:	Arne Jansen <lists@...-jansens.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, efault@....de,
	npiggin@...nel.dk, akpm@...ux-foundation.org,
	frank.rowand@...sony.com, tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/locking] sched: Add p->pi_lock to task_rq_lock()

On 03.06.2011 14:44, Linus Torvalds wrote:
> On Fri, Jun 3, 2011 at 7:02 PM, Arne Jansen <lists@...-jansens.de> wrote:
>>
>> No, it doesn't trigger, but the hang is not as complete as I first
>> thought. A running iostat via ssh continues to give output for a while,
>> the serial console still reacts to return and prompts for login. But
>> after a while more and more locks up. The console locks as soon as I
>> sysrq-t.
> 
> Is it the tty rescheduling bug?
> 
> That would explain the printk's mattering.
> 
> Remove the schedule_work() call from flush_to_ldisc() in
> drivers/tty/tty_buffer.c and see if the problem goes away. See the
> other discussion thread on lkml ("tty breakage in X (Was: tty vs
> workqueue oddities)")
> 
> Hmm?

No change. Also git bisect quite clearly points to
0122ec5b02f766c and ab2515c4b98f7bc4, both are older than
b1c43f82c5aa2654 mentioned in the other thread.

-Arne


>                    Linus
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