linux-kernel - [PATCH 0/2 v2] rcu: Fix series of spurious RCU softirqs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1292015471-19227-1-git-send-email-fweisbec@gmail.com>
Date:	Fri, 10 Dec 2010 22:11:09 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 0/2 v2] rcu: Fix series of spurious RCU softirqs

Hi,

Following Lai's idea.

An example of such series of spurious softirqs:

http://tglx.de/~fweisbec/trace_rcu_softirq.txt

In that example, the rcu softirq is raised at every tick
during 20 secs (was perhaps more, but the trace snapshot happened
during 20 secs). It happens randomly.

Ah and it survived several hours of rcutorture (with rcu cpu stall
detection).

Thanks.

Frederic Weisbecker (2):
  rcu: Stop chasing QS if another CPU did it for us
  rcu: Keep gpnum and completed fields synchronized

 kernel/rcutree.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

-- 
1.7.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/