linux-kernel - [PATCH AUTOSEL 5.4 020/130] locktorture: Prevent hangs for invalid arguments

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Message-Id: <20201223021813.2791612-20-sashal@kernel.org>
Date:   Tue, 22 Dec 2020 21:16:23 -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>
Subject: [PATCH AUTOSEL 5.4 020/130] locktorture: Prevent hangs for invalid arguments

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

[ Upstream commit 6b74fa0a776e3715d385b23d29db469179c825b0 ]

If an locktorture 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 lock_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/locking/locktorture.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index e09562818bb74..410b0c586ba83 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/percpu-rwsem.h>
 #include <linux/torture.h>
+#include <linux/reboot.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Paul E. McKenney <paulmck@...ux.ibm.com>");
@@ -1044,6 +1045,10 @@ static int __init lock_torture_init(void)
 unwind:
 	torture_init_end();
 	lock_torture_cleanup();
+	if (shutdown_secs) {
+		WARN_ON(!IS_MODULE(CONFIG_LOCK_TORTURE_TEST));
+		kernel_power_off();
+	}
 	return firsterr;
 }
 
-- 
2.27.0