linux-kernel - [PATCH AUTOSEL 4.4 09/38] rcutorture: Prevent hangs for invalid arguments

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Date:   Tue, 22 Dec 2020 21:24:47 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        Sasha Levin <sashal@...nel.org>, rcu@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 09/38] rcutorture: Prevent hangs for invalid arguments

From: "Paul E. McKenney" <paulmck@...nel.org>

[ Upstream commit 4994684ce10924a0302567c315c91b0a64eeef46 ]

If an rcutorture torture-test run is given a bad kvm.sh argument, the
test will complain to the console, which is good.  What is bad is that
from the user's perspective, it will just hang for the time specified
by the --duration argument.  This commit therefore forces an immediate
kernel shutdown if a rcu_torture_init()-time error occurs, thus avoiding
the appearance of a hang.  It also forces a console splat in this case
to clearly indicate the presence of an error.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/rcu/rcutorture.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 041a02b334d73..d808212822d71 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1914,6 +1914,10 @@ rcu_torture_init(void)
 unwind:
 	torture_init_end();
 	rcu_torture_cleanup();
+	if (shutdown_secs) {
+		WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST));
+		kernel_power_off();
+	}
 	return firsterr;
 }

-- 
2.27.0