From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755806AbbGQXrC (ORCPT ); Fri, 17 Jul 2015 19:47:02 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:51511 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754891AbbGQXpr (ORCPT ); Fri, 17 Jul 2015 19:45:47 -0400 X-Helo: d03dlp02.boulder.ibm.com X-MailFrom: paulmck@linux.vnet.ibm.com X-RcptTo: linux-kernel@vger.kernel.org From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 4/6] rcutorture: Fix rcu_torture_cbflood() for callback-free RCU Date: Fri, 17 Jul 2015 16:45:35 -0700 Message-Id: <1437176737-26668-4-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1437176737-26668-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20150717234518.GA26072@linux.vnet.ibm.com> <1437176737-26668-1-git-send-email-paulmck@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15071723-0029-0000-0000-00000B541C64 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" The rcu_torture_cbflood() function correctly checks for flavors of RCU that lack analogs to call_rcu() and rcu_barrier(), but in that case it fails to terminate correctly. In fact, it terminates so incorrectly that segfaults can result. This commit therefore causes rcu_torture_cbflood() to do the proper wait-for-stop procedure. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 1cead7806ca6..e0eda3c1b621 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -823,9 +823,7 @@ rcu_torture_cbflood(void *arg) } if (err) { VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); - while (!torture_must_stop()) - schedule_timeout_interruptible(HZ); - return 0; + goto wait_for_stop; } VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); do { @@ -844,6 +842,7 @@ rcu_torture_cbflood(void *arg) stutter_wait("rcu_torture_cbflood"); } while (!torture_must_stop()); vfree(rhp); +wait_for_stop: torture_kthread_stopping("rcu_torture_cbflood"); return 0; } -- 1.8.1.5