import json import logging import errno import re from teuthology.contextutil import MaxWhileTries from teuthology.exceptions import CommandFailedError from teuthology.orchestra.run import wait from tasks.cephfs.cephfs_test_case import CephFSTestCase, long_running DAMAGED_ON_START = "damaged_on_start" DAMAGED_ON_LS = "damaged_on_ls" CRASHED = "server crashed" NO_DAMAGE = "no damage" FAILED_CLIENT = "client failed" FAILED_SERVER = "server failed" # An EIO in response to a stat from the client EIO_ON_LS = "eio" # An EIO, but nothing in damage table (not ever what we expect) EIO_NO_DAMAGE = "eio without damage entry" log = logging.getLogger(__name__) class TestDamage(CephFSTestCase): def _simple_workload_write(self): self.mount_a.run_shell(["mkdir", "subdir"]) self.mount_a.write_n_mb("subdir/sixmegs", 6) return self.mount_a.stat("subdir/sixmegs") def is_marked_damaged(self, rank): mds_map = self.fs.get_mds_map() return rank in mds_map['damaged'] @long_running #459s def test_object_deletion(self): """ That the MDS has a clean 'damaged' response to loss of any single metadata object """ self._simple_workload_write() # Hmm, actually it would be nice to permute whether the metadata pool # state contains sessions or not, but for the moment close this session # to avoid waiting through reconnect on every MDS start. self.mount_a.umount_wait() for mds_name in self.fs.get_active_names(): self.fs.mds_asok(["flush", "journal"], mds_name) self.fs.mds_stop() self.fs.mds_fail() self.fs.rados(['export', '/tmp/metadata.bin']) def is_ignored(obj_id, dentry=None): """ A filter to avoid redundantly mutating many similar objects (e.g. stray dirfrags) or similar dentries (e.g. stray dir dentries) """ if re.match("60.\.00000000", obj_id) and obj_id != "600.00000000": return True if dentry and obj_id == "100.00000000": if re.match("stray.+_head", dentry) and dentry != "stray0_head": return True return False def get_path(obj_id, dentry=None): """ What filesystem path does this object or dentry correspond to? i.e. what should I poke to see EIO after damaging it? """ if obj_id == "1.00000000" and dentry == "subdir_head": return "./subdir" elif obj_id == "10000000000.00000000" and dentry == "sixmegs_head": return "./subdir/sixmegs" # None means ls will do an "ls -R" in hope of seeing some errors return None objects = self.fs.rados(["ls"]).split("\n") objects = [o for o in objects if not is_ignored(o)] # Find all objects with an OMAP header omap_header_objs = [] for o in objects: header = self.fs.rados(["getomapheader", o]) # The rados CLI wraps the header output in a hex-printed style header_bytes = int(re.match("header \((.+) bytes\)", header).group(1)) if header_bytes > 0: omap_header_objs.append(o) # Find all OMAP key/vals omap_keys = [] for o in objects: keys_str = self.fs.rados(["listomapkeys", o]) if keys_str: for key in keys_str.split("\n"): if not is_ignored(o, key): omap_keys.append((o, key)) # Find objects that have data in their bodies data_objects = [] for obj_id in objects: stat_out = self.fs.rados(["stat", obj_id]) size = int(re.match(".+, size (.+)$", stat_out).group(1)) if size > 0: data_objects.append(obj_id) # Define the various forms of damage we will inflict class MetadataMutation(object): def __init__(self, obj_id_, desc_, mutate_fn_, expectation_, ls_path=None): self.obj_id = obj_id_ self.desc = desc_ self.mutate_fn = mutate_fn_ self.expectation = expectation_ if ls_path is None: self.ls_path = "." else: self.ls_path = ls_path def __eq__(self, other): return self.desc == other.desc def __hash__(self): return hash(self.desc) junk = "deadbeef" * 10 mutations = [] # Removals for obj_id in objects: if obj_id in [ # JournalPointers are auto-replaced if missing (same path as upgrade) "400.00000000", # Missing dirfrags for non-system dirs result in empty directory "10000000000.00000000", ]: expectation = NO_DAMAGE else: expectation = DAMAGED_ON_START log.info("Expectation on rm '{0}' will be '{1}'".format( obj_id, expectation )) mutations.append(MetadataMutation( obj_id, "Delete {0}".format(obj_id), lambda o=obj_id: self.fs.rados(["rm", o]), expectation )) # Blatant corruptions mutations.extend([ MetadataMutation( o, "Corrupt {0}".format(o), lambda o=o: self.fs.rados(["put", o, "-"], stdin_data=junk), DAMAGED_ON_START ) for o in data_objects ]) # Truncations mutations.extend([ MetadataMutation( o, "Truncate {0}".format(o), lambda o=o: self.fs.rados(["truncate", o, "0"]), DAMAGED_ON_START ) for o in data_objects ]) # OMAP value corruptions for o, k in omap_keys: if o.startswith("100."): # Anything in rank 0's 'mydir' expectation = DAMAGED_ON_START else: expectation = EIO_ON_LS mutations.append( MetadataMutation( o, "Corrupt omap key {0}:{1}".format(o, k), lambda o=o,k=k: self.fs.rados(["setomapval", o, k, junk]), expectation, get_path(o, k) ) ) # OMAP header corruptions for obj_id in omap_header_objs: if re.match("60.\.00000000", obj_id) \ or obj_id in ["1.00000000", "100.00000000", "mds0_sessionmap"]: expectation = DAMAGED_ON_START else: expectation = NO_DAMAGE log.info("Expectation on corrupt header '{0}' will be '{1}'".format( obj_id, expectation )) mutations.append( MetadataMutation( obj_id, "Corrupt omap header on {0}".format(obj_id), lambda o=obj_id: self.fs.rados(["setomapheader", o, junk]), expectation ) ) results = {} for mutation in mutations: log.info("Applying mutation '{0}'".format(mutation.desc)) # Reset MDS state self.mount_a.umount_wait(force=True) self.fs.mds_stop() self.fs.mds_fail() self.fs.mon_manager.raw_cluster_cmd('mds', 'repaired', '0') # Reset RADOS pool state self.fs.rados(['import', '/tmp/metadata.bin']) # Inject the mutation mutation.mutate_fn() # Try starting the MDS self.fs.mds_restart() # How long we'll wait between starting a daemon and expecting # it to make it through startup, and potentially declare itself # damaged to the mon cluster. startup_timeout = 60 if mutation.expectation not in (EIO_ON_LS, DAMAGED_ON_LS, NO_DAMAGE): if mutation.expectation == DAMAGED_ON_START: # The MDS may pass through active before making it to damaged try: self.wait_until_true(lambda: self.is_marked_damaged(0), startup_timeout) except RuntimeError: pass # Wait for MDS to either come up or go into damaged state try: self.wait_until_true(lambda: self.is_marked_damaged(0) or self.fs.are_daemons_healthy(), startup_timeout) except RuntimeError: crashed = False # Didn't make it to healthy or damaged, did it crash? for daemon_id, daemon in self.fs.mds_daemons.items(): if daemon.proc and daemon.proc.finished: crashed = True log.error("Daemon {0} crashed!".format(daemon_id)) daemon.proc = None # So that subsequent stop() doesn't raise error if not crashed: # Didn't go health, didn't go damaged, didn't crash, so what? raise else: log.info("Result: Mutation '{0}' led to crash".format(mutation.desc)) results[mutation] = CRASHED continue if self.is_marked_damaged(0): log.info("Result: Mutation '{0}' led to DAMAGED state".format(mutation.desc)) results[mutation] = DAMAGED_ON_START continue else: log.info("Mutation '{0}' did not prevent MDS startup, attempting ls...".format(mutation.desc)) else: try: self.wait_until_true(self.fs.are_daemons_healthy, 60) except RuntimeError: log.info("Result: Mutation '{0}' should have left us healthy, actually not.".format(mutation.desc)) if self.is_marked_damaged(0): results[mutation] = DAMAGED_ON_START else: results[mutation] = FAILED_SERVER continue log.info("Daemons came up after mutation '{0}', proceeding to ls".format(mutation.desc)) # MDS is up, should go damaged on ls or client mount self.mount_a.mount() self.mount_a.wait_until_mounted() if mutation.ls_path == ".": proc = self.mount_a.run_shell(["ls", "-R", mutation.ls_path], wait=False) else: proc = self.mount_a.stat(mutation.ls_path, wait=False) if mutation.expectation == DAMAGED_ON_LS: try: self.wait_until_true(lambda: self.is_marked_damaged(0), 60) log.info("Result: Mutation '{0}' led to DAMAGED state after ls".format(mutation.desc)) results[mutation] = DAMAGED_ON_LS except RuntimeError: if self.fs.are_daemons_healthy(): log.error("Result: Failed to go damaged on mutation '{0}', actually went active".format( mutation.desc)) results[mutation] = NO_DAMAGE else: log.error("Result: Failed to go damaged on mutation '{0}'".format(mutation.desc)) results[mutation] = FAILED_SERVER else: try: wait([proc], 20) log.info("Result: Mutation '{0}' did not caused DAMAGED state".format(mutation.desc)) results[mutation] = NO_DAMAGE except MaxWhileTries: log.info("Result: Failed to complete client IO on mutation '{0}'".format(mutation.desc)) results[mutation] = FAILED_CLIENT except CommandFailedError as e: if e.exitstatus == errno.EIO: log.info("Result: EIO on client") results[mutation] = EIO_ON_LS else: log.info("Result: unexpected error {0} on client".format(e)) results[mutation] = FAILED_CLIENT if mutation.expectation == EIO_ON_LS: # EIOs mean something handled by DamageTable: assert that it has # been populated damage = json.loads( self.fs.mon_manager.raw_cluster_cmd( 'tell', 'mds.{0}'.format(self.fs.get_active_names()[0]), "damage", "ls", '--format=json-pretty')) if len(damage) == 0: results[mutation] = EIO_NO_DAMAGE failures = [(mutation, result) for (mutation, result) in results.items() if mutation.expectation != result] if failures: log.error("{0} mutations had unexpected outcomes:".format(len(failures))) for mutation, result in failures: log.error(" Expected '{0}' actually '{1}' from '{2}'".format( mutation.expectation, result, mutation.desc )) raise RuntimeError("{0} mutations had unexpected outcomes".format(len(failures))) else: log.info("All {0} mutations had expected outcomes".format(len(mutations))) def test_damaged_dentry(self): # Damage to dentrys is interesting because it leaves the # directory's `complete` flag in a subtle state where # we have marked the dir complete in order that folks # can access it, but in actual fact there is a dentry # missing self.mount_a.run_shell(["mkdir", "subdir/"]) self.mount_a.run_shell(["touch", "subdir/file_undamaged"]) self.mount_a.run_shell(["touch", "subdir/file_to_be_damaged"]) subdir_ino = self.mount_a.path_to_ino("subdir") self.mount_a.umount_wait() for mds_name in self.fs.get_active_names(): self.fs.mds_asok(["flush", "journal"], mds_name) self.fs.mds_stop() self.fs.mds_fail() # Corrupt a dentry junk = "deadbeef" * 10 dirfrag_obj = "{0:x}.00000000".format(subdir_ino) self.fs.rados(["setomapval", dirfrag_obj, "file_to_be_damaged_head", junk]) # Start up and try to list it self.fs.mds_restart() self.fs.wait_for_daemons() self.mount_a.mount() self.mount_a.wait_until_mounted() dentries = self.mount_a.ls("subdir/") # The damaged guy should have disappeared self.assertEqual(dentries, ["file_undamaged"]) # I should get ENOENT if I try and read it normally, because # the dir is considered complete try: self.mount_a.stat("subdir/file_to_be_damaged", wait=True) except CommandFailedError as e: self.assertEqual(e.exitstatus, errno.ENOENT) else: raise AssertionError("Expected ENOENT") # The fact that there is damaged should have bee recorded damage = json.loads( self.fs.mon_manager.raw_cluster_cmd( 'tell', 'mds.{0}'.format(self.fs.get_active_names()[0]), "damage", "ls", '--format=json-pretty')) self.assertEqual(len(damage), 1) damage_id = damage[0]['id'] # If I try to create a dentry with the same name as the damaged guy # then that should be forbidden try: self.mount_a.touch("subdir/file_to_be_damaged") except CommandFailedError as e: self.assertEqual(e.exitstatus, errno.EIO) else: raise AssertionError("Expected EIO") # Attempting that touch will clear the client's complete flag, now # when I stat it I'll get EIO instead of ENOENT try: self.mount_a.stat("subdir/file_to_be_damaged", wait=True) except CommandFailedError as e: self.assertEqual(e.exitstatus, errno.EIO) else: raise AssertionError("Expected EIO") nfiles = self.mount_a.getfattr("./subdir", "ceph.dir.files") self.assertEqual(nfiles, "2") self.mount_a.umount_wait() # Now repair the stats scrub_json = self.fs.mds_asok(["scrub_path", "/subdir", "repair"]) log.info(json.dumps(scrub_json, indent=2)) self.assertEqual(scrub_json["passed_validation"], False) self.assertEqual(scrub_json["raw_stats"]["checked"], True) self.assertEqual(scrub_json["raw_stats"]["passed"], False) # Check that the file count is now correct self.mount_a.mount() self.mount_a.wait_until_mounted() nfiles = self.mount_a.getfattr("./subdir", "ceph.dir.files") self.assertEqual(nfiles, "1") # Clean up the omap object self.fs.rados(["setomapval", dirfrag_obj, "file_to_be_damaged_head", junk]) # Clean up the damagetable entry self.fs.mon_manager.raw_cluster_cmd( 'tell', 'mds.{0}'.format(self.fs.get_active_names()[0]), "damage", "rm", "{did}".format(did=damage_id)) # Now I should be able to create a file with the same name as the # damaged guy if I want. self.mount_a.touch("subdir/file_to_be_damaged")