[Zope-dev] Sporadic IOErrors...?

[Shane Hathaway]

Bjorn Stabell wrote:
> Hi Zope gurus,
> 
> After upgrading to Zope 2.6.1 on Linux, when submitting forms, we
> sometimes get this error:
> 
>     Site Error
>     ...
>     exceptions.IOError
>     ...
>     Traceback:
> 	Module ZPublisher.Publish, line 150, in publish_module
> 	Module ZPublisher.Publish, line 114, in publish
> 	Module Zope.App.startup, line 149, in zpublisher_exception_hook
> 	Module Products.SiteErrorLog.SiteErrorLog, line 195, in raising
> 	Module Products.SiteErrorLog.SiteErrorLog, line 206, in
> 	_do_copy_to_zlog
> 	Module zLOG, line 130, in LOG
> 	Module ZLogger.ZLogger, line 16, in log_write
> 	Module ZLogger.stupidFileLogger, line 27, in __call__
> 	Module ZLogger.stupidFileLogger, line 90, in stupid_log_write
> 	IOError: [Errno 5] Input/output error
> 	...
> 
> It's terrible hard to debug as it happens sporadically, not
> consistently, and we don't get any more debug info than this.  Even
> worse, we have a standard-error-message that emails errors to us, but it
> fails to do anything in this case.  Any ideas what could be wrong and
> how to troubleshoot better?  The disks have plenty of free space; after
> restarting, or waiting a while, things work again.

This usually means Python is trying to write to stdout or stderr and 
failing because stdout/stderr don't go anywhere.  Make sure you have a 
log file configured (using the EVENT_LOG_FILE environment variable, 
rather than the old STUPID_LOG_FILE).

Shane