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From "Dominik Psenner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4NET-496) RollingFileAppender.ActivateOptions throws UnauthorizedAccessException
Date Tue, 15 Dec 2015 08:29:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057612#comment-15057612
] 

Dominik Psenner commented on LOG4NET-496:
-----------------------------------------

I do not think that you have to grant permissions to the log directory as a mutex is requested
operating system wide. The second process requesting the mutex throws an UnauthorizedAccessException
because the mutex already exists and the process does not have the mutex privilege SYNCHRONIZE|MUTEX_MODIFY
or MUTEX_ALL respectively. I'm not that familiar with cloud services, but maybe there's some
magic switch or configuration option that allows you to configure this for your application?

Another option could be to try to create the mutex and if that fails with an UnauthorizedAccessException
we could try to open the existing mutex. But this feels hacky and it would introduce a race
condition if the mutex exists but is released by the first process before the second process
can open it.

> RollingFileAppender.ActivateOptions throws UnauthorizedAccessException
> ----------------------------------------------------------------------
>
>                 Key: LOG4NET-496
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-496
>             Project: Log4net
>          Issue Type: Bug
>    Affects Versions: 1.2.14
>            Reporter: Fabian Pachner
>
> We upgraded our Azure cloud service project from log4net 1.2.13 to 1.2.14 and received
the following exception when the web roles are starting up:
> {code}
> System.UnauthorizedAccessException: Access to the path 'C__Resources_directory_9b9a1e064b78414281c81f861d0634b0.Role.Web.Frontend.DiagnosticStore_LogFiles_UI_UI_0'
is denied.
>    at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
>    at System.Threading.Mutex.MutexTryCodeHelper.MutexTryCode(Object userData)
>    at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object userData)
>    at System.Threading.Mutex.CreateMutexWithGuaranteedCleanup(Boolean initiallyOwned,
String name, Boolean& createdNew, SECURITY_ATTRIBUTES secAttrs)
>    at System.Threading.Mutex..ctor(Boolean initiallyOwned, String name, Boolean&
createdNew, MutexSecurity mutexSecurity)
>    at System.Threading.Mutex..ctor(Boolean initiallyOwned, String name, Boolean&
createdNew)
>    at log4net.Appender.RollingFileAppender.ActivateOptions()
>    at Base.Logging.AzureFileLogAppender.ActivateOptions() in j:\Source\Commons\Logging\AzureFileLogAppender.cs:line
95
>    at log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement
appenderElement)
> {code}
> This affects the w3wp process of the web role. A consequence of this is that file logging
isn't working for that process. We didn't have that exception with log4net 1.2.13 and recognized
there was a change in 1.2.14 in RollingFileAppender.ActivateOptions: A mutex is created there
and that seems to lead to the mentioned exception.
> Can you tell us whether it is likely that this issue was already fixed with 1.2.15? And
if so, when will this version be available via Nuget package? Thank you!



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