This is actually normal. See the end of http://www.plope.com/Books/2_7Edition/Sessions.stx ("Conflict Errors") for a short explanation.
On Tue, 2005-05-03 at 08:00 -0700, [EMAIL PROTECTED] wrote: > I'm getting a ZODB.POSException.ReadConflictError on my Plone 2.0.5 > site (Zope 2.7.3, Python 2.3.4 on Mac OS X Server 10.3.9). It happens > most frequently when members try to register on my site (about 10% of > the time), but occasionally happens when other pages are accessed (no > pattern). Alternatively, a blank page is returned. No messages appear > in the Zope or Plone error log. > > I've reproduced the error messages below, all of which resulted from a > member registration. I received 7 error reports were from the past two > days, with two types of errors. Of the two types of errors, the "oid > 0x07e8, class BTrees.IOBTree.IOBucket" error was seen 5 times and the > "oid 0x08, class Products.Transience.Transience.Length2" error was seen > twice. > > Is there something wrong with my installation or is there something > wrong with my data.fs file? How do I correct either? > > Marshall > > -- > > TYPE 1 ERROR > > Site Error > > An error was encountered while publishing this resource. > > ZODB.POSException.ReadConflictError > Sorry, a site error occurred. > > Traceback (innermost last): > > * Module ZPublisher.Publish, line 175, in publish_module_standard > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 139, in publish > * Module Zope.App.startup, line 163, in zpublisher_exception_hook > * Module ZPublisher.Publish, line 101, in publish > * Module ZPublisher.mapply, line 88, in mapply > * Module ZPublisher.Publish, line 39, in call_object > * Module Products.CMFFormController.ControllerPageTemplate, line > 80, in __call__ > * Module Products.CMFFormController.BaseControllerPageTemplate, > line 39, in _call > * Module Products.CMFFormController.ControllerBase, line 243, in > getNext > * Module Products.CMFFormController.Actions.TraverseTo, line 36, in > __call__ > * Module ZPublisher.mapply, line 88, in mapply > * Module ZPublisher.Publish, line 39, in call_object > * Module Products.CMFFormController.FSControllerPythonScript, line > 102, in __call__ > * Module Products.CMFFormController.FormController, line 354, in > validate > * Module ZPublisher.BaseRequest, line 156, in items > * Module ZPublisher.HTTPRequest, line 1178, in get > * Module Products.Sessions.SessionDataManager, line 94, in > getSessionData > * Module Products.Sessions.SessionDataManager, line 181, in > _getSessionDataObject > * Module Products.Transience.Transience, line 840, in > new_or_existing > * Module Products.Transience.Transience, line 487, in get > * Module Products.Transience.Transience, line 293, in _move_item > * Module ZODB.Connection, line 599, in setstate > * Module ZODB.Connection, line 628, in _is_invalidated > > ReadConflictError: database read conflict error (oid 0x0f81, class > BTrees.IOBTree.IOBucket) > > -- > > TYPE 2 ERROR > > Site Error > > An error was encountered while publishing this resource. > > ZODB.POSException.ReadConflictError > Sorry, a site error occurred. > > Traceback (innermost last): > > * Module ZPublisher.Publish, line 175, in publish_module_standard > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 149, in publish > * Module Products.PlacelessTranslationService.PatchStringIO, line > 51, in new_publish > * Module ZPublisher.Publish, line 139, in publish > * Module Zope.App.startup, line 163, in zpublisher_exception_hook > * Module ZPublisher.Publish, line 101, in publish > * Module ZPublisher.mapply, line 88, in mapply > * Module ZPublisher.Publish, line 39, in call_object > * Module Products.CMFFormController.ControllerPageTemplate, line > 80, in __call__ > * Module Products.CMFFormController.BaseControllerPageTemplate, > line 39, in _call > * Module Products.CMFFormController.ControllerBase, line 243, in > getNext > * Module Products.CMFFormController.Actions.TraverseTo, line 36, in > __call__ > * Module ZPublisher.mapply, line 88, in mapply > * Module ZPublisher.Publish, line 39, in call_object > * Module Products.CMFFormController.FSControllerPythonScript, line > 102, in __call__ > * Module Products.CMFFormController.FormController, line 354, in > validate > * Module ZPublisher.BaseRequest, line 156, in items > * Module ZPublisher.HTTPRequest, line 1178, in get > * Module Products.Sessions.SessionDataManager, line 94, in > getSessionData > * Module Products.Sessions.SessionDataManager, line 181, in > _getSessionDataObject > * Module Products.Transience.Transience, line 840, in > new_or_existing > * Module Products.Transience.Transience, line 487, in get > * Module Products.Transience.Transience, line 276, in _move_item > * Module Products.Transience.Transience, line 939, in _housekeep > * Module Products.Transience.Transience, line 566, in _finalize > * Module Products.Transience.Transience, line 600, in > _do_finalize_work > * Module ZODB.Connection, line 599, in setstate > * Module ZODB.Connection, line 628, in _is_invalidated > > ReadConflictError: database read conflict error (oid 0x08, class > Products.Transience.Transience.Length2) > > -- 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