<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)">  <style>  </style> </head> <body lang=EN-US link=blue vlink=blue> <div class=Section1> Hi Naveen,<o:p></o:p> The program I am running is doing a stress test. <o:p></o:p> 4 threads (configurable number from command line) are making the upstart sync/asyncapi (upstart_get_version()) calls. 1 separate thread is running the g_main_loop_run() to handle responses from the async calls.<o:p></o:p> The test runs fine for several hundreds of api call request per thread and then crashes. <o:p></o:p> The initial  dbus_g_bus_get() is successful. I do a null check. I did not show it in my steps below.<o:p></o:p> The fact that connection is null after several api calls leads me to think there is some memory corruption happening.<o:p></o:p> <o:p> </o:p> The same program runs fine for several thousands of successful api calls on a ppc based board running 2 cores.<o:p></o:p> Output from a ppc based board<o:p></o:p> ---------------------------------------------<o:p></o:p>  [PTHREAD 2].Count[41352] sent async request<o:p></o:p>  [PTHREAD 3].Count[41352] sent async request<o:p></o:p>  [PTHREAD 2].Count[41352] Async CallBack. Got Version[init (upstart 0.5.0)]<o:p></o:p>  [PTHREAD 3].Count[41352] Async CallBack. Got Version[init (upstart 0.5.0)]<o:p></o:p>  [PTHREAD 1].Count[41352] sent async request<o:p></o:p>  [PTHREAD 4].Count[41352] sent async request<o:p></o:p>  [PTHREAD 1].Count[41352] Async CallBack. Got Version[init (upstart 0.5.0)]<o:p></o:p>  [PTHREAD 4].Count[41352] Async CallBack. Got Version[init (upstart 0.5.0)]<o:p></o:p> <o:p> </o:p> Thanks,<o:p></o:p> Sandeep<o:p></o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: Naveen Verma [mailto:ernaveenverma@gmail.com] Sent: Tuesday, June 09, 2009 11:27 PM To: Sandeep Puddupakkam (spuddupa) Cc: dbus@lists.freedesktop.org Subject: Re: Application crash when invoking upstart dbus api's.<o:p></o:p> </div> <o:p> </o:p> Hi,<o:p></o:p> <div> <blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt; margin-left:4.8pt;margin-right:0in'> <o:p> </o:p> <div link=blue vlink=purple> <div> Hello,<o:p></o:p> I am trying to investigate a crash in the dbus/dbus-glib code when trying to use dbus-glib to communicate with upstart 0.5.<o:p></o:p>  <o:p></o:p> Whenever a crash occurs, it always seems to be failing with a similar stack trace (see below).<o:p></o:p> The system is a 4 core cavium board (mips).<o:p></o:p> The test application is using 4 gthreads to make upstart async api calls to get upstart version in a while loop.<o:p></o:p> We have started a separate gthread to that does a g_main_loop_run() to handle responses from the async calls.<o:p></o:p> The application crashes after several successful api requests (1000 +)<o:p></o:p> The same code does not crash on a 2 core ppc based board.<o:p></o:p>  <o:p></o:p> The software versions we are using are as follows.<o:p></o:p> Upstart     Version   0.5<o:p></o:p> dbus-glib   Version  0.76<o:p></o:p> dbus         Version  1.2.1<o:p></o:p> glib           Version  2.6.6<o:p></o:p>  <o:p></o:p> The code flow looks like this<o:p></o:p> main()<o:p></o:p> {<o:p></o:p> g_type_init ();<o:p></o:p> g_thread_init(NULL);<o:p></o:p> dbus_g_thread_init();<o:p></o:p> //Create dbus connection<o:p></o:p> connection = dbus_g_bus_get (DBUS_BUS_SYSTEM,&error);<o:p></o:p> </div> </div> </blockquote> <div> -- Could you check if you get the connection here, because in the bt it look like your connection object is NULL.  <o:p></o:p> </div> <blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt; margin-left:4.8pt;margin-right:0in'> <div link=blue vlink=purple> <div> //Create upstart proxy to be shared by the 4 threads.<o:p></o:p> upstartProxy = dbus_g_proxy_new_for_name (connection,<o:p></o:p>                                                 UPSTART_SERVICE, /* "com.ubuntu.Upstart"*/<o:p></o:p>                                                 UPSTART_SERVICE_PATH, /* "/com/ubuntu/Upstart"*/<o:p></o:p>                                                 UPSTART_INTERFACE); /* "com.ubuntu.Upstart"*/<o:p></o:p> //Create mutex to lock/unlock before each of the threads makes the async call.<o:p></o:p> myMutex=g_mutex_new();<o:p></o:p> //Upstart Proxy and mutex are passed to all 4 threads.<o:p></o:p> //Create 1 gthread that runs g_main_loop_run() to handle callbacks for async calls.<o:p></o:p> //Create 4 gthreads to make async calls.<o:p></o:p> //call g_thread_join() on all 5 threads.<o:p></o:p> }<o:p></o:p> </div> </div> </blockquote> <div> -- Well, did not understand, why you are creating so many threads.  <o:p></o:p> </div> <blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt; margin-left:4.8pt;margin-right:0in'> <div link=blue vlink=purple> <div> <o:p> </o:p>  <o:p></o:p> Thanks,<o:p></o:p> Sandeep<o:p></o:p> </div> </div> -Br<o:p></o:p> </blockquote> <div> Naveen <o:p></o:p> </div> <blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt; margin-left:4.8pt;margin-right:0in'> _______________________________________________ dbus mailing list <a href="mailto:dbus@lists.freedesktop.org">dbus@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/dbus" target="_blank">http://lists.freedesktop.org/mailman/listinfo/dbus</a><o:p></o:p> </blockquote> </div> <o:p> </o:p> </div> </body> </html>