qa: add script to test udev event reaping

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
(cherry picked from commit 898c113f93a05a18f47f2dd6a94f7cf56c858185)

diff --git a/qa/suites/krbd/rbd-nomount/tasks/krbd_udev_netlink_enobufs.yaml b/qa/suites/krbd/rbd-nomount/tasks/krbd_udev_netlink_enobufs.yaml
new file mode 100644 (file)
index 0000000..b0530d5
--- /dev/null
+++ b/qa/suites/krbd/rbd-nomount/tasks/krbd_udev_netlink_enobufs.yaml
@@ -0,0 +1,10 @@
+overrides:
+  ceph:
+    log-whitelist:
+      - pauserd,pausewr flag\(s\) set
+
+tasks:
+- workunit:
+    clients:
+      all:
+        - rbd/krbd_udev_netlink_enobufs.sh

diff --git a/qa/workunits/rbd/krbd_udev_netlink_enobufs.sh b/qa/workunits/rbd/krbd_udev_netlink_enobufs.sh
new file mode 100755 (executable)
index 0000000..7c9c53a
--- /dev/null
+++ b/qa/workunits/rbd/krbd_udev_netlink_enobufs.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# This is a test for https://tracker.ceph.com/issues/41404, verifying that udev
+# events are properly reaped while the image is being (un)mapped in the kernel.
+# UDEV_BUF_SIZE is 1M (giving us a 2M socket receive buffer), but modprobe +
+# modprobe -r generate ~28M worth of "block" events.
+
+set -ex
+
+rbd create --size 1 img
+
+ceph osd pause
+sudo rbd map img &
+PID=$!
+sudo modprobe scsi_debug max_luns=16 add_host=16 num_parts=1 num_tgts=16
+sudo udevadm settle
+sudo modprobe -r scsi_debug
+[[ $(rbd showmapped | wc -l) -eq 0 ]]
+ceph osd unpause
+wait $PID
+[[ $(rbd showmapped | wc -l) -eq 2 ]]
+sudo rbd unmap img
+
+echo OK