Commit e6fb1fc1 authored Feb 07, 2016 by Artem Savkov Committed by Paul E. McKenney Mar 31, 2016

rcuperf: Do not wake up shutdown wait queue if "shutdown" is false.

After finishing its tests rcuperf tries to wake up shutdown_wq even if
"shutdown" param is set to false, resulting in a wake_up() call on an
unitialized wait_queue_head_t which leads to "BUG: spinlock bad magic" and
"BUG: unable to handle kernel NULL pointer dereference".

Fix by checking "shutdown" param before waking up the queue.

Signed-off-by: Artem Savkov <artem.savkov@gmail.com>

parent dba6f1ba

kernel/rcu/rcuperf.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -423,10 +423,12 @@ rcu_perf_writer(void *arg)
		b_rcu_perf_writer_finished =
		cur_ops->completed();
		}
		if (shutdown) {
		smp_mb(); /* Assign before wake. */
		wake_up(&shutdown_wq);
		}
		}
		}
		if (done && !alldone &&
		atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters)
		alldone = true;

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