From: Tejun Heo <tj@kernel.org>
To: linux-kernel@vger.kernel.org, dvyukov@google.com,
mingo@kernel.org, peterz@infradead.org, sasha.levin@oracle.com,
torvalds@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling stuff
Date: Wed, 6 Jan 2016 15:17:23 -0500 [thread overview]
Message-ID: <20160106201723.GH3660@htj.duckdns.org> (raw)
In-Reply-To: <tip-be958bdc96f18bc1356177bbb79d46ea0c037b96@git.kernel.org>
On Wed, Jan 06, 2016 at 10:48:15AM -0800, tip-bot for Peter Zijlstra wrote:
> Commit-ID: be958bdc96f18bc1356177bbb79d46ea0c037b96
> Gitweb: http://git.kernel.org/tip/be958bdc96f18bc1356177bbb79d46ea0c037b96
> Author: Peter Zijlstra <peterz@infradead.org>
> AuthorDate: Wed, 25 Nov 2015 16:02:07 +0100
> Committer: Ingo Molnar <mingo@kernel.org>
> CommitDate: Wed, 6 Jan 2016 11:01:07 +0100
>
> sched/core: Fix unserialized r-m-w scribbling stuff
>
> Some of the sched bitfieds (notably sched_reset_on_fork) can be set
> on other than current, this can cause the r-m-w to race with other
> updates.
>
> Since all the sched bits are serialized by scheduler locks, pull them
> in a separate word.
>
> Reported-by: Tejun Heo <tj@kernel.org>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Sasha Levin <sasha.levin@oracle.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: akpm@linux-foundation.org
> Cc: hannes@cmpxchg.org
> Cc: mhocko@kernel.org
> Cc: vdavydov@parallels.com
> Link: http://lkml.kernel.org/r/20151125150207.GM11639@twins.programming.kicks-ass.net
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
cc stable?
--
tejun
prev parent reply other threads:[~2016-01-06 20:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20151125150207.GM11639@twins.programming.kicks-ass.net>
2016-01-06 18:48 ` [tip:sched/core] sched/core: Fix unserialized r-m-w scribbling stuff tip-bot for Peter Zijlstra
2016-01-06 20:17 ` Tejun Heo [this message]
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