From a86a66fc2cbb77cdf0df69f3589c325018261d67 Mon Sep 17 00:00:00 2001
From: Adrian Reber <areber@redhat.com>
Date: Thu, 4 Nov 2021 09:10:38 +0000
Subject: [PATCH] ci: fix userfaultfd test failures

Newer kernels (5.11) require echo 1 > /proc/sys/vm/unprivileged_userfaultfd

Without the 'echo 1' the kernel prints a message like this:

 uffd: Set unprivileged_userfaultfd sysctl knob to 1 if kernel faults must be handled without obtaining CAP_SYS_PTRACE capability

Signed-off-by: Adrian Reber <areber@redhat.com>
---
 scripts/ci/run-ci-tests.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/ci/run-ci-tests.sh b/scripts/ci/run-ci-tests.sh
index 51aa7db9e..096f907fb 100755
--- a/scripts/ci/run-ci-tests.sh
+++ b/scripts/ci/run-ci-tests.sh
@@ -197,6 +197,12 @@ fi
 # shellcheck disable=SC2086
 ./test/zdtm.py run -a -p 2 --keep-going $ZDTM_OPTS
 
+# Newer kernels are blocking access to userfaultfd:
+# uffd: Set unprivileged_userfaultfd sysctl knob to 1 if kernel faults must be handled without obtaining CAP_SYS_PTRACE capability
+if [ -e /proc/sys/vm/unprivileged_userfaultfd ]; then
+	echo 1 > /proc/sys/vm/unprivileged_userfaultfd
+fi
+
 LAZY_EXCLUDE="-x maps04 -x cmdlinenv00 -x maps007"
 
 LAZY_TESTS='.*(maps0|uffd-events|lazy-thp|futex|fork).*'