tests: Increase file descriptor limit

Sometimes (randomly), the integration tests fail on the CI. Try to increase the file
descriptor limit to see if it helps. This is a good idea in general though, as
the test become more complex this would be required anyway.

Signed-off-by: Matej Hrica <mhrica@redhat.com>

Author: mtjhrc

.github/workflows/integration_tests.yml

@@ -51,5 +51,9 @@ jobs:
       - name: Install libkrunfw
         run: curl -L -o /tmp/libkrunfw-4.9.0-x86_64.tgz https://github.com/containers/libkrunfw/releases/download/v4.9.0/libkrunfw-4.9.0-x86_64.tgz && mkdir tmp && tar xf /tmp/libkrunfw-4.9.0-x86_64.tgz -C tmp && sudo mv tmp/lib64/* /lib/x86_64-linux-gnu
 
+      - name: Increase file descriptor limit
+        run: |
+          ulimit -n unlimited
+
       - name: Integration tests
         run: RUST_LOG=trace KRUN_ENOMEM_WORKAROUND=1 KRUN_NO_UNSHARE=1 make test

tests/run.sh

@@ -16,6 +16,8 @@ cargo build -p runner
 
 export KRUN_TEST_GUEST_AGENT_PATH="target/$GUEST_TARGET_ARCH/debug/guest-agent"
 
+ulimit -n 4096
+
 if [ -z "${KRUN_NO_UNSHARE}" ] && which unshare 2>&1 >/dev/null; then
 	unshare --user --map-root-user --net -- /bin/sh -c "ifconfig lo 127.0.0.1 && exec target/debug/runner $@"
 else