test/common: Log all system uevents during autotest

This may be useful in debugging and pinpointing devices which may
take longer time to initialize during the tests.

Signed-off-by: Michal Berger <michalx.berger@intel.com>
Change-Id: I5abad17e1a2690a063b6152462dcf49d22c70d0f
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3656
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

autotest.sh

@@ -36,6 +36,11 @@ if [ $(uname -s) = Linux ]; then
 	# make sure nbd (network block device) driver is loaded if it is available
 	# this ensures that when tests need to use nbd, it will be fully initialized
 	modprobe nbd || true
+
+	if udevadm=$(type -P udevadm); then
+		"$udevadm" monitor --property &> "$output_dir/udev.log" &
+		udevadm_pid=$!
+	fi
 fi
 
 trap "process_core; autotest_cleanup; exit 1" SIGINT SIGTERM EXIT

test/common/autotest_common.sh

@@ -1186,6 +1186,9 @@ function autotest_cleanup() {
 	if [[ -n $old_core_pattern ]]; then
 		echo "$old_core_pattern" > /proc/sys/kernel/core_pattern
 	fi
+	if [[ -e /proc/$udevadm_pid/status ]]; then
+		kill "$udevadm_pid" || :
+	fi
 }
 
 function freebsd_update_contigmem_mod() {