SSDPServerController.OnExpirationTimerElapsed: Cannot acquire synchronization lock. Maybe a deadlock (2 Viewers)

[MrTechno]

The service has started but the error log is full of these (one per second)

 

[morpheus_xx]

Thanks for reporting! Maybe @MJGraf can check this, as he already works in UPnP library parts

 

[MrTechno]

If it's any help I'm running on WHS 2011. Not seen the error before and the only thing I've done recently is enable remote access VPN. I'll turn it off and see if it helps.

 

[MrTechno]

Already tried a vanilla reinstall just in case it was SlimTV causing the issue. Still seeing the error

 

[breese]

In Computer Management / Services
is SSDP Discovery enabled?

 

[MrTechno]

This lock really is locked! Service wouldn't stop, couldn't kill the process. Had to put it in manual mode, then reboot, then turn off VPN. Another reboot and everything is fine again. SSDP is running at the moment. Going to try turning VPN on again now

 

[morpheus_xx]

I took already a look into code, the affected object is "_cpData.SyncObj", which is used in many places for synchronization.

So there could one process hanging during any network action, which would lock out other callers from the CpData object.

Can you please describe more in detail what lead to the lock? Did MP2-Server worked once and suddenly hung? Or did it never work until you deactivated VPN? I could imagine that VPN network could be a cause for the problem.

 

[MrTechno]

When the VPN is active MP2-Server doesn't start properly. From a cold boot Services reports it as "Started" but MP2 ServiceMonitor status is "Disconnected from server".

Comparing successful logs with VPN disabled and unsuccessful logs with VPN enabled there's an extra network interface in the unsuccessful log:

[2014-01-05 17:40:43,546] [5218 ] [Main ] [DEBUG] - UPnPServer: Initializing IP endpoint '169.254.0.20'
[2014-01-05 17:40:43,546] [5218 ] [Main ] [INFO ] - UPnPServerController: SSDP enabled for IP endpoint '169.254.0.20', search port is 1900

According to ipconfig that address belongs to "PPP adapter RAS (Dial In) Interface"

 

[morpheus_xx]

Can you please upload both logfiles so we can compare them also?

MP2 currently starts its UPnP services on each available network adapter. Maybe we need to introduce a setting to limit it to one or more chosen network adapters.
Another way would be to add timeouts for service creation.

 

[MrTechno]

Here's a successful startup with VPN disabled