1# Copyright (c) 2012 The Chromium OS Authors. All rights reserved. 2# Use of this source code is governed by a BSD-style license that can be 3# found in the LICENSE file. 4 5import logging, re 6 7from autotest_lib.client.common_lib import error 8from autotest_lib.server import test 9 10class kernel_EmptyLines(test.test): 11 version = 1 12 13 def run_once(self, host=None): 14 self.client = host 15 16 # Reboot the client 17 logging.info('kernel_EmptyLines: reboot %s' % self.client.hostname) 18 self.client.reboot() 19 20 # Get dmesg since boot and check for empty printk lines. 21 # Format is from start of line: '[ x.yyyyyy] ' where x.y is 22 # the timestamp. 23 # 24 # A typical example for an error: 25 # [ 3.799802] device-mapper: init: foo bar 26 # [ 3.799807] 27 # [ 3.799921] device-mapper: done 28 29 result = self.client.run('dmesg') 30 match = re.search('^\[[\s0-9\.]+\]\s*$', result.stdout, re.M) 31 32 lines = result.stdout.count('\n') 33 34 if match: 35 raise error.TestFail("Found an empty line in dmesg: '%s'" % 36 match.group(0)) 37 elif lines < 5: 38 raise error.TestFail("Only got %d lines of dmesg" % lines) 39 else: 40 logging.info('kernel_EmptyLines: checked %d lines' % lines) 41