From: "Paul E. McKenney" <paulmck@linux.ibm.com>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, 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,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
"Paul E. McKenney" <paulmck@linux.ibm.com>
Subject: [PATCH tip/core/rcu 6/9] rcutorture: Fix cleanup path for invalid torture_type strings
Date: Tue, 26 Mar 2019 16:31:15 -0700 [thread overview]
Message-ID: <20190326233118.23057-6-paulmck@linux.ibm.com> (raw)
In-Reply-To: <20190326233054.GA21523@linux.ibm.com>
If the specified rcutorture.torture_type is not in the rcu_torture_init()
function's torture_ops[] array, rcutorture prints some console messages
and then invokes rcu_torture_cleanup() to set state so that a future
torture test can run. However, rcu_torture_cleanup() also attempts to
end the test that didn't actually start, and in doing so relies on the
value of cur_ops, a value that is not particularly relevant in this case.
This can result in confusing output or even follow-on failures due to
attempts to use facilities that have not been properly initialized.
This commit therefore sets the value of cur_ops to NULL in this case
and inserts a check near the beginning of rcu_torture_cleanup(),
thus avoiding relying on an irrelevant cur_ops value.
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
---
kernel/rcu/rcutorture.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b42682b94cb7..e3c0f57ab0aa 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2089,6 +2089,10 @@ rcu_torture_cleanup(void)
cur_ops->cb_barrier();
return;
}
+ if (!cur_ops) {
+ torture_cleanup_end();
+ return;
+ }
rcu_torture_barrier_cleanup();
torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_task);
@@ -2262,6 +2266,7 @@ rcu_torture_init(void)
pr_cont("\n");
WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST));
firsterr = -EINVAL;
+ cur_ops = NULL;
goto unwind;
}
if (cur_ops->fqs == NULL && fqs_duration != 0) {
--
2.17.1
next prev parent reply other threads:[~2019-03-26 23:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-26 23:30 [PATCH tip/core/rcu 0/9] Torture-test updates for v5.2 Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 1/9] torture: Don't try to offline the last CPU Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 2/9] tools/.../rcutorture: Convert to SPDX license identifier Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 3/9] rcutorture: Make rcutorture_extend_mask() comment match the code Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 4/9] rcutorture: Remove ->ext_irq_conflict field Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 5/9] rcutorture: Fix expected forward progress duration in OOM notifier Paul E. McKenney
2019-03-26 23:31 ` Paul E. McKenney [this message]
2019-03-26 23:31 ` [PATCH tip/core/rcu 7/9] rcuperf: Fix cleanup path for invalid perf_type strings Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 8/9] locktorture: NULL cxt.lwsa and cxt.lrsa to allow bad-arg detection Paul E. McKenney
2019-03-26 23:31 ` [PATCH tip/core/rcu 9/9] torture: Suppress false-positive CONFIG_INITRAMFS_SOURCE complaint Paul E. McKenney
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