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#!/usr/bin/env bash
set -ex
set -o pipefail
function refresh_loop() {
local dev_id="$1"
set +x
local i
for ((i = 1; ; i++)); do
echo 1 | sudo tee "${SYSFS_DIR}/${dev_id}/refresh" > /dev/null
if ((i % 100 == 0)); then
echo "Refreshed ${i} times"
fi
done
}
readonly SYSFS_DIR="/sys/bus/rbd/devices"
readonly IMAGE_NAME="watch-errors-test"
rbd create -s 1G --image-feature exclusive-lock "${IMAGE_NAME}"
# induce a watch error every 30 seconds
dev="$(sudo rbd device map -o osdkeepalive=60 "${IMAGE_NAME}")"
dev_id="${dev#/dev/rbd}"
# constantly refresh, not just on watch errors
refresh_loop "${dev_id}" &
refresh_pid=$!
sudo dmesg -C
# test that none of the above triggers a deadlock with a workload
fio --name test --filename="${dev}" --ioengine=libaio --direct=1 \
--rw=randwrite --norandommap --randrepeat=0 --bs=512 --iodepth=128 \
--time_based --runtime=1h --eta=never
num_errors="$(dmesg | grep -c "rbd${dev_id}: encountered watch error")"
echo "Recorded ${num_errors} watch errors"
kill "${refresh_pid}"
wait
sudo rbd device unmap "${dev}"
if ((num_errors < 60)); then
echo "Too few watch errors"
exit 1
fi
echo OK
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