[Mono-dev] Mono 2.4.2.2: too many roots set & other errors

[Zoltan Varga]

Hi,

  This is a known problem, but it should happen only under windows. It
should be fixed in
 SVN HEAD and the mono 2.4 branch (r139249). Unfortunately, there is no
workaround.

                         Zoltan

On Sat, Aug 1, 2009 at 7:38 PM, Maxim <makska at yandex.ru> wrote:

> Hello!
>
> I've upgraded mono on production server for about week ago and got trouble:
> several times (up to two per day) I've found error in apache error_log
> file:
> Too many root sets
>
> Stacktrace:
>
>  at (wrapper managed-to-native)
> object.__icall_wrapper_mono_delegate_begin_invoke (object,intptr) <0x00048>
>  at (wrapper managed-to-native)
> object.__icall_wrapper_mono_delegate_begin_invoke (object,intptr)
> <0xffffffff>
>  at (wrapper delegate-begin-invoke)
>
> System.Threading.WaitCallback.begin_invoke_IAsyncResult__this___object_AsyncCallback_object
> (object,System.AsyncCallback,object) <0xffffffff>
>  at System.Threading.ThreadPool.QueueUserWorkItem
> (System.Threading.WaitCallback,object) <0x0001f>
>  at System.Threading.Timer.SchedulerThread () <0x003c7>
>  at (wrapper runtime-invoke) object.runtime_invoke_void__this__
> (object,intptr,intptr,intptr) <0xffffffff>
>
> Native stacktrace:
>
>    /opt/mono/bin/mono [0x47e7a0]
>    /lib64/libpthread.so.0 [0x3e3e60e4c0]
>    /lib64/libc.so.6(gsignal+0x35) [0x3e3da30215]
>    /lib64/libc.so.6(abort+0x110) [0x3e3da31cc0]
>    /opt/mono/bin/mono [0x574553]
>    /opt/mono/bin/mono [0x572fc5]
>    /opt/mono/bin/mono [0x572f29]
>    /opt/mono/bin/mono [0x50a18e]
>    /opt/mono/bin/mono [0x4fee6c]
>    /opt/mono/bin/mono [0x502ef5]
>    /opt/mono/bin/mono [0x4c1083]
>    [0x40d34038]
>
> Debug info from gdb:
>
> =================================================================
> Got a SIGABRT while executing native code. This usually indicates
> a fatal error in the mono runtime or one of the native libraries
> used by your application.
> =================================================================
>
> and a lots of errors after it, for example:
> [Sat Aug 01 20:12:04 2009] [error] (104)Connection reset by peer:
> read_data failed
> [Sat Aug 01 20:12:04 2009] [error] (70014)End of file found: read_data
> failed
> [Sat Aug 01 20:12:04 2009] [error] Command stream corrupted, last
> command was -1
> [Sat Aug 01 20:12:04 2009] [notice] child pid 17038 exit signal
> Segmentation fault (11)
>
> After it all mono applications returns no data (nagios: HTTP CRITICAL -
> No data received from host).
> Only restart of apache make application healthy again.
>
> Also there are a lot of errors in error_log (almost every second), but
> it seems like no relation to this crash:
> [Sat Aug 01 14:12:05 2009] [crit] (13)Permission denied: Failed to
> attach to existing dashboard, and removing dashboard file
> '/tmp/mod_mono_dashboard_XXGLOBAL_1' failed (Operation not permitted).
> Further action impossible.
>
> How I set up mod_mono and apache (with mono 2.0.1 it works just fine. It
> seems like 2.0.1 is most stable release for me) :
> mod_mono.conf:
>    LoadModule mono_module /usr/lib64/httpd/modules/mod_mono.so
>    MonoAutoApplication enabled
>
>    MonoMaxActiveRequests 70
>    MonoMaxWaitingRequests 500
>    MonoServerPath "/opt/mono/bin/mod-mono-server2"
>
>    AddType application/x-asp-net .aspx
> ....
>    DirectoryIndex index.aspx
> -------------------
>
> For heavy loaded sites (about 20 on this server) I have separated
> mod_mono server instances and vhosts like this:
> <VirtualHost *:80>
>    ServerName mysite.com
>    AddMonoApplications mysite.com
> "mysite.com:/:/home/myuser/www/mysite.com"
>    MonoServerPath mysite.com "/opt/mono/bin/mod-mono-server2"
>    <Location />
>        AddHandler mono .aspx .ascx .config .axd .asax .ashx .asmx .dll
>        MonoSetServerAlias mysite.com
>    </Location>
>    MonoAutoApplication disabled
>    MonoSetEnv MONO_THREADS_PER_CPU=2000
>    MonoMaxActiveRequests 75
>    MonoMaxWaitingRequests 200
> ....
> </VirtualHost>
>
> For all other websites (for about 80) I have one instance of mod_mono
> server and hosts like this, with no special mono directives (I suppose
> mono auto applications work here):
> <VirtualHost *:80>
>    ServerName mysite.com
> ....
> </VirtualHost>
>
> So could anyone give me please advice how to fix this problem?
> Or how to set up mod_mono in more stable way?
>
> All the best,
> Maxim Karavaev
>
>
> _______________________________________________
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> Mono-devel-list at lists.ximian.com
> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>
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