From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [patch 0/4] DEBUG_RCU_HEAD: Debug and fix racy call_rcu() users
Date: Tue, 6 Oct 2009 21:20:54 -0700 [thread overview]
Message-ID: <20091007042054.GE6838@linux.vnet.ibm.com> (raw)
In-Reply-To: <20091006143727.868480435@polymtl.ca>
On Tue, Oct 06, 2009 at 10:37:28AM -0400, Mathieu Desnoyers wrote:
> Here is a patchset, done on 2.6.30.9, which permits to detect and fix racy
> call_rcu() users.
>
> Fix for vunmap, which happens to be one of them, is included.
>
> Note that some false-positives might come up when call_rcu() is called on
> uninitialized struct rcu_head. The solution is, surprisingly enough, to
> initialize them.
Very cool, Mathieu!!!
I do like adding the debug-only field to struct rcu_head. Lots of
additional places need initialization, or am I missing a trick here?
Thanx, Paul
next prev parent reply other threads:[~2009-10-07 4:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 14:37 [patch 0/4] DEBUG_RCU_HEAD: Debug and fix racy call_rcu() users Mathieu Desnoyers
2009-10-06 14:37 ` [patch 1/4] kernel call_rcu usage: initialize rcu_head structures Mathieu Desnoyers
2009-10-06 15:19 ` [patch 1/4] kernel call_rcu usage: initialize rcu_head structures (v2) Mathieu Desnoyers
2009-10-06 14:37 ` [patch 2/4] tree rcu: Add debug RCU head option Mathieu Desnoyers
2009-10-06 15:54 ` Eric Dumazet
2009-10-06 16:09 ` Mathieu Desnoyers
2009-10-06 16:17 ` Eric Dumazet
2009-10-06 16:35 ` Mathieu Desnoyers
2009-10-06 14:37 ` [patch 3/4] markers call_rcu usage: initialize rcu_head structures Mathieu Desnoyers
2009-10-06 14:37 ` [patch 4/4] vunmap: Fix racy use of rcu_head Mathieu Desnoyers
2009-10-06 14:37 ` Mathieu Desnoyers
2009-10-06 15:23 ` Mathieu Desnoyers
2009-10-06 15:23 ` Mathieu Desnoyers
2009-10-06 16:43 ` Christoph Lameter
2009-10-06 16:43 ` Christoph Lameter
2009-10-06 17:33 ` Mathieu Desnoyers
2009-10-06 17:33 ` Mathieu Desnoyers
2009-10-07 4:20 ` Paul E. McKenney [this message]
2009-10-07 12:36 ` [patch 0/4] DEBUG_RCU_HEAD: Debug and fix racy call_rcu() users Mathieu Desnoyers
2009-10-12 18:07 ` Ingo Molnar
2009-10-12 18:30 ` Mathieu Desnoyers
2009-10-12 18:37 ` Ingo Molnar
2009-10-12 18:56 ` Thomas Gleixner
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