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

[tip-bot2 for Paul E. McKenney]

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@xxxxxxxxxx>
AuthorDate:    Thu, 03 Dec 2020 13:27:42 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
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@xxxxxxxxxx>
---
 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)