linux-kernel - [tip: core/rcu] torture: Stop hanging on panic

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Message-ID: <161313344587.23325.14886256316738427651.tip-bot2@tip-bot2>
Date:   Fri, 12 Feb 2021 12:37:25 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: core/rcu] torture: Stop hanging on panic

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     f716348f29d30e8ef3a1ceed3fea19490aba4fe4
Gitweb:        https://git.kernel.org/tip/f716348f29d30e8ef3a1ceed3fea19490aba4fe4
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Thu, 03 Dec 2020 13:27:42 -08:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 04 Jan 2021 14:01:23 -08:00

torture: Stop hanging on panic

By default, the "panic" kernel parameter is zero, which causes the kernel
to loop indefinitely after a panic().  The rcutorture scripting will
eventually kill the corresponding qemu process, but only after waiting
for the full run duration plus a few minutes.  This works, but delays
notifying the developer of the failure.

This commit therefore causes the rcutorture scripting to pass the
"panic=-1" kernel parameter, which caused the kernel to instead
unceremoniously shut down immediately.  This in turn causes qemu to
terminate, so that if all of the runs in a given batch panic(), the
rcutorture scripting can immediately proceed to the next batch.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/testing/selftests/rcutorture/bin/functions.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh
index 97c3a17..c35ba24 100644
--- a/tools/testing/selftests/rcutorture/bin/functions.sh
+++ b/tools/testing/selftests/rcutorture/bin/functions.sh
@@ -203,6 +203,7 @@ identify_qemu () {
 # and the TORTURE_QEMU_INTERACTIVE environment variable.
 identify_qemu_append () {
 	echo debug_boot_weak_hash
+	echo panic=-1
 	local console=ttyS0
 	case "$1" in
 	qemu-system-x86_64|qemu-system-i386)