| Author |
|
jmatthewsr
Junior
Joined: April 09 2008
Posts: 40
|
| Posted: April 17 2008 at 8:50pm | IP Logged
|
|
|
Using the multi session conference example ap, the protos test suite crashed the app around test #1000.
This also leads me to ask what kind of crash handling and analysis the media engine has. Is the media engine capable of creating windows minidump files for analysis, etc?
http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/sip/ index.html
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 18 2008 at 6:05am | IP Logged
|
|
|
Hi Justin,
Thanks for pointing out the failure. We will run the test suite yet today to see what is going on.
As far as crash reporting and mini dumps, we have continued to use Dr. Watson (drwtsn32) when needed. We have outgrown using Dr. Watson and know we are in need of a better fully integrated mini dump solution.
What we need to do is add crash handler support directly to the media engine that will only fire for unhandled exceptions in the address space of the loaded media engine DLL module. This has been on our “to do” list for about a year now. Eventually we will get it completed. Using this crash handler, we will be able grab all the debug info we need and give the end user a chance to send the information directly to our support servers for later analysis. This crash reporting would be enabled or disabled via the media engine API.
This was a great question. Apparently, mamma raised no fool. :)
Thanks,
Support
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 18 2008 at 6:10am | IP Logged
|
|
|
One other item…..
We know basically what we want to do with the integrated crash handling.
However, if you have previous experience with this and a good implementation of the crash handling as described above, feel free to forward the C/C++ source code to us. We will check it out. Doing so allow us to get the crash handling added to the product sooner. Just a thought….
Support
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 18 2008 at 2:47pm | IP Logged
|
|
|
Hi Justin,
We received your direct emails with the crasher.zip archive. Good job. We will look at it as soon as possible. We appreciate you sharing your thoughts and taking the time to craft very thoughtful email responses. Very nice... thank you.
Yes, the John Robbins books are “the” reference for understanding and handling mini dumps. They are here on the engineering bookshelf in the lab. Good to know you have experience with this.
For all releases of the media engine, we maintain PDB images for both Debug and Release builds so if we receive mini dumps from the field, we can do the post mortem. Sounds like you have been in tough field debugging situations before. Haven’t we all…..
Support
|
| Back to Top |
|
| |
jmatthewsr
Junior
Joined: April 09 2008
Posts: 40
|
| Posted: April 18 2008 at 2:58pm | IP Logged
|
|
|
Thanks. If I get some time I will catch the exception seen in the protos suite and send you the minidump and we can do a test-run.
-justin
|
| Back to Top |
|
| |
jmatthewsr
Junior
Joined: April 09 2008
Posts: 40
|
| Posted: April 27 2008 at 8:15pm | IP Logged
|
|
|
I have a crash dump for your review. This is appears to be happening when receiving a SUBSCRIBE (this is not during a protos test).
If possible, I would like to upload the minidump for your review. Please send the FTP (or other) information.
Thanks,
-justin
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 28 2008 at 11:59am | IP Logged
|
|
|
Hi Justin,
We will create a support FTP account here for you. We will email you the details shortly.
We have a "shut down" day today for maintenance and will be back in full swing tomorrow.
Thanks,
Support
|
| Back to Top |
|
| |
jmatthewsr
Junior
Joined: April 09 2008
Posts: 40
|
| Posted: April 28 2008 at 12:45pm | IP Logged
|
|
|
Minidump has been uploaded.
thanks,
-justin
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 29 2008 at 9:55am | IP Logged
|
|
|
OK, got it...
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 29 2008 at 10:17am | IP Logged
|
|
|
Justin,
We need a clarification:
1) So the exception you originally detected was not caused by running the protos test suite?
2) The exception is cause by sending the media engine “any old” SUBSCRIBE request?
Justin asked us these questions in an offline email:
Also, is there a workaround for the SUBSCRIBE issue? Can I somehow drop the SUBSCRIBE before the exception occurs?
Answer:
Not sure yet if there is a workaround for the failing SUBSCRIBE. However, yes you can intercept the raw SUBSCRIBE request that is received by the media engine (prior to the media engine performing any SIP parsing or processing) and it can be ignored. To do this, your app can handle the “immediate event” called SipModifySipMessage.
How to:
If your app handles this event, it will get the address of a SIP_MESSAGE_IMMEDIATE_DATA structure. Look at the Received structure member to determine it the SIP message is being transmitted or received. You can detect a received SIP message that is a SUBSCRIBE by using the ppSipMsg member to access the raw SIP message and simply scan it for the “SUBSCRIBE sip:” header. Once you determine you have received a SUBSCRIBE request, your app can then set the IgnoreSipMessage member in the SIP_MESSAGE_IMMEDIATE_DATA structure to non zero and the media engine will toss out the received SUBSCRIBE request. This method can be applies to any received SIP message.
Support
|
| Back to Top |
|
| |
jmatthewsr
Junior
Joined: April 09 2008
Posts: 40
|
| Posted: April 29 2008 at 10:24am | IP Logged
|
|
|
Exception occurs in both the protos test suite and in another test where I believe that the crash is related to a SUBSCRIBE. I've uploaded a log dump of the crash that is not related to the protos suite.
These crashes are probably not related, I should have started a different thread. Sorry for the confusion.
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: April 29 2008 at 1:29pm | IP Logged
|
|
|
Got it. Thanks for the clarification.
|
| Back to Top |
|
| |
support
Administrator
Joined: January 26 2005
Location: United States
Posts: 1666
|
| Posted: May 24 2008 at 6:47am | IP Logged
|
|
|
Hi Justin,
Regarding subjecting the VOIP Media Engine to the PROTOS SIP test suite:
We just completed testing the media engine against the latest Release 1 and Release 2 of the PROTOS test suite.
We did locate a few issues. After fixing them, the media engine now passes all test cases. We will be sure to roll all the fixes into the next v5.12.8.4 and upcoming v6 releases. You can read more about the test findings at this support forum post:
VOIP Media Engine and PROTOS SIP test suite (c07-sip):
http://www.lanscapecorp.com/forum/forum_posts.asp?TID=483&PN =1
Thanks for pointing out the PROTOS tests. We knew about the PROTOS tests a few years ago but did not find the time to execute them until now.
Support
|
| Back to Top |
|
| |
Active Topics 
Member List 
Search 
Help 
Register 
Login
LanScape Support Forum -> LanScape VOIP Media Engine™ - Pre-Sales Technical Support
Topic: sip stack fails protos test suite, possible dos
