Sync does not fully complete on firefox 27.0.1.

1394461229406	Sync.Engine.Forms	WARN	Got exception App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < resource://gre/modules/services-common/async.js:141 < resource://gre/modules/services-sync/engines/forms.js:63 < resource://gre/modules/services-sync/engines/forms.js:137 < doApplyBatch()@resource://services-sync/engines.js:889 < resource://services-sync/engines.js:1000 < resource://services-sync/record.js:625 < Channel_onDataAvail()@resource://services-sync/resource.js:542 < <file:unknown>, aborting processIncoming.
1394461229406	Sync.Collection	WARN	Got exception calling onProgress handler during fetch of https://phx-sync462.services.mozilla.com/1.1/kalium/storage/forms?newer=1394420841.85&full=1
1394461229407	Sync.Collection	DEBUG	App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < _sleep()@resource://services-sync/engines.js:275 < resource://services-sync/engines.js:1002 < resource://services-sync/record.js:625 < Channel_onDataAvail()@resource://services-sync/resource.js:542 < <file:unknown>
1394461229408	Sync.Status	DEBUG	Status for engine forms: error.engine.reason.unknown_fail
1394461229408	Sync.Status	DEBUG	Status.service: success.status_ok => error.sync.failed_partial
1394461229408	Sync.ErrorHandler	DEBUG	forms failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170
1394461229409	Sync.Engine.History	INFO	68 outgoing items pre-reconciliation
1394461229413	Sync.Status	DEBUG	Status for engine history: error.engine.reason.unknown_fail
1394461229413	Sync.Status	DEBUG	Status.service: error.sync.failed_partial => error.sync.failed_partial
1394461229413	Sync.ErrorHandler	DEBUG	history failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170
1394461229414	Sync.Engine.Passwords	INFO	0 outgoing items pre-reconciliation
1394461229415	Sync.Status	DEBUG	Status for engine passwords: error.engine.reason.unknown_fail
1394461229416	Sync.Status	DEBUG	Status.service: error.sync.failed_partial => error.sync.failed_partial
1394461229416	Sync.ErrorHandler	DEBUG	passwords failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170
1394461229416	Sync.Engine.Prefs	INFO	0 outgoing items pre-reconciliation
1394461229417	Sync.Engine.Prefs	INFO	Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled.
1394461229417	Sync.Engine.Tabs	INFO	1 outgoing items pre-reconciliation
1394461229417	Sync.Engine.Tabs	INFO	Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled.
1394461229434	Sync.Status	DEBUG	Status for engine tabs: error.engine.reason.unknown_fail
1394461229434	Sync.Status	DEBUG	Status.service: error.sync.failed_partial => error.sync.failed_partial
1394461229435	Sync.ErrorHandler	DEBUG	tabs failed: App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < _sleep()@resource://services-sync/engines.js:275 < resource://services-sync/engines.js:1365 < resource://services-sync/engines.js:1421 < WrappedNotify()@resource://services-sync/util.js:142 < resource://services-sync/engines.js:594 < _syncEngine()@resource://services-sync/stages/enginesync.js:192 < sync()@resource://services-sync/stages/enginesync.js:147 < onNotify()@resource://gre/modules/services-sync/service.js:1197 < WrappedNotify()@resource://services-sync/util.js:142 < WrappedLock()@resource://services-sync/util.js:97 < _lockedSync()@resource://gre/modules/services-sync/service.js:1191 < resource://gre/modules/services-sync/service.js:1182 < WrappedCatch()@resource://services-sync/util.js:71 < sync()@resource://gre/modules/services-sync/service.js:1170 < <file:unknown>
1394461229435	Sync.Engine.Addons	DEBUG	Refreshing reconciler state
1394461229435	Sync.AddonsReconciler	INFO	Refreshing global state from AddonManager.
1394461229436	Sync.Status	DEBUG	Status for engine addons: error.engine.reason.unknown_fail
1394461229436	Sync.Status	DEBUG	Status.service: error.sync.failed_partial => error.sync.failed_partial
1394461229436	Sync.ErrorHandler	DEBUG	addons failed: App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < resource://gre/modules/services-common/async.js:141 < _ensureStateLoaded()@resource://gre/modules/services-sync/addonsreconciler.js:579 < pruneChangesBeforeDate()@resource://gre/modules/services-sync/addonsreconciler.js:526 < _syncCleanup()@resource://gre/modules/services-sync/engines/addons.js:216 < resource://services-sync/engines.js:1424 < WrappedNotify()@resource://services-sync/util.js:142 < resource://services-sync/engines.js:594 < _syncEngine()@resource://services-sync/stages/enginesync.js:192 < sync()@resource://services-sync/stages/enginesync.js:147 < onNotify()@resource://gre/modules/services-sync/service.js:1197 < WrappedNotify()@resource://services-sync/util.js:142 < WrappedLock()@resource://services-sync/util.js:97 < _lockedSync()@resource://gre/modules/services-sync/service.js:1191 < resource://gre/modules/services-sync/service.js:1182 < WrappedCatch()@resource://services-sync/util.js:71 < sync()@resource://gre/modules/services-sync/service.js:1170 < <file:unknown>
1394461229437	Sync.Synchronizer	INFO	Sync completed at 2014-03-10 09:20:29 after 1219.25 secs.

This has been occurring across three computers, two Windows and one OS X. Errors from the sync-log look like this: <pre><nowiki>1394461229406 Sync.Engine.Forms WARN Got exception App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < resource://gre/modules/services-common/async.js:141 < resource://gre/modules/services-sync/engines/forms.js:63 < resource://gre/modules/services-sync/engines/forms.js:137 < doApplyBatch()@resource://services-sync/engines.js:889 < resource://services-sync/engines.js:1000 < resource://services-sync/record.js:625 < Channel_onDataAvail()@resource://services-sync/resource.js:542 < <file:unknown>, aborting processIncoming. 1394461229406 Sync.Collection WARN Got exception calling onProgress handler during fetch of https://phx-sync462.services.mozilla.com/1.1/kalium/storage/forms?newer=1394420841.85&full=1 1394461229407 Sync.Collection DEBUG App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < _sleep()@resource://services-sync/engines.js:275 < resource://services-sync/engines.js:1002 < resource://services-sync/record.js:625 < Channel_onDataAvail()@resource://services-sync/resource.js:542 < <file:unknown> 1394461229408 Sync.Status DEBUG Status for engine forms: error.engine.reason.unknown_fail 1394461229408 Sync.Status DEBUG Status.service: success.status_ok => error.sync.failed_partial 1394461229408 Sync.ErrorHandler DEBUG forms failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170 1394461229409 Sync.Engine.History INFO 68 outgoing items pre-reconciliation 1394461229413 Sync.Status DEBUG Status for engine history: error.engine.reason.unknown_fail 1394461229413 Sync.Status DEBUG Status.service: error.sync.failed_partial => error.sync.failed_partial 1394461229413 Sync.ErrorHandler DEBUG history failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170 1394461229414 Sync.Engine.Passwords INFO 0 outgoing items pre-reconciliation 1394461229415 Sync.Status DEBUG Status for engine passwords: error.engine.reason.unknown_fail 1394461229416 Sync.Status DEBUG Status.service: error.sync.failed_partial => error.sync.failed_partial 1394461229416 Sync.ErrorHandler DEBUG passwords failed: App. Quitting JS Stack trace: Res_get@resource.js:413 < @engines.js:1007 < @engines.js:1419 < WrappedNotify@util.js:142 < @engines.js:594 < _syncEngine@enginesync.js:192 < sync@enginesync.js:147 < onNotify@service.js:1197 < WrappedNotify@util.js:142 < WrappedLock@util.js:97 < _lockedSync@service.js:1191 < @service.js:1182 < WrappedCatch@util.js:71 < sync@service.js:1170 1394461229416 Sync.Engine.Prefs INFO 0 outgoing items pre-reconciliation 1394461229417 Sync.Engine.Prefs INFO Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled. 1394461229417 Sync.Engine.Tabs INFO 1 outgoing items pre-reconciliation 1394461229417 Sync.Engine.Tabs INFO Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled. 1394461229434 Sync.Status DEBUG Status for engine tabs: error.engine.reason.unknown_fail 1394461229434 Sync.Status DEBUG Status.service: error.sync.failed_partial => error.sync.failed_partial 1394461229435 Sync.ErrorHandler DEBUG tabs failed: App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < _sleep()@resource://services-sync/engines.js:275 < resource://services-sync/engines.js:1365 < resource://services-sync/engines.js:1421 < WrappedNotify()@resource://services-sync/util.js:142 < resource://services-sync/engines.js:594 < _syncEngine()@resource://services-sync/stages/enginesync.js:192 < sync()@resource://services-sync/stages/enginesync.js:147 < onNotify()@resource://gre/modules/services-sync/service.js:1197 < WrappedNotify()@resource://services-sync/util.js:142 < WrappedLock()@resource://services-sync/util.js:97 < _lockedSync()@resource://gre/modules/services-sync/service.js:1191 < resource://gre/modules/services-sync/service.js:1182 < WrappedCatch()@resource://services-sync/util.js:71 < sync()@resource://gre/modules/services-sync/service.js:1170 < <file:unknown> 1394461229435 Sync.Engine.Addons DEBUG Refreshing reconciler state 1394461229435 Sync.AddonsReconciler INFO Refreshing global state from AddonManager. 1394461229436 Sync.Status DEBUG Status for engine addons: error.engine.reason.unknown_fail 1394461229436 Sync.Status DEBUG Status.service: error.sync.failed_partial => error.sync.failed_partial 1394461229436 Sync.ErrorHandler DEBUG addons failed: App. Quitting Stack trace: resource://gre/modules/services-common/async.js:123 < waitForSyncCallback()@resource://gre/modules/services-common/async.js:98 < resource://gre/modules/services-common/async.js:141 < _ensureStateLoaded()@resource://gre/modules/services-sync/addonsreconciler.js:579 < pruneChangesBeforeDate()@resource://gre/modules/services-sync/addonsreconciler.js:526 < _syncCleanup()@resource://gre/modules/services-sync/engines/addons.js:216 < resource://services-sync/engines.js:1424 < WrappedNotify()@resource://services-sync/util.js:142 < resource://services-sync/engines.js:594 < _syncEngine()@resource://services-sync/stages/enginesync.js:192 < sync()@resource://services-sync/stages/enginesync.js:147 < onNotify()@resource://gre/modules/services-sync/service.js:1197 < WrappedNotify()@resource://services-sync/util.js:142 < WrappedLock()@resource://services-sync/util.js:97 < _lockedSync()@resource://gre/modules/services-sync/service.js:1191 < resource://gre/modules/services-sync/service.js:1182 < WrappedCatch()@resource://services-sync/util.js:71 < sync()@resource://gre/modules/services-sync/service.js:1170 < <file:unknown> 1394461229437 Sync.Synchronizer INFO Sync completed at 2014-03-10 09:20:29 after 1219.25 secs.</nowiki></pre>