I make a quick review, use checkpatch and post it. Thanks for testing and sorry to not always take the time needed to propose a patch to mainline. Christophe On 10/26/2017 12:54 PM, Jonas Bonn wrote: On 10/26/2017 12:43 PM, Christophe Ronco wrote: Seems to be this: i) When the modem is first powered on, service discovery takes some time (more than 5 seconds) ii) The service discovery timeout fires before the QMI request returns so discover_reply gets called before discover_callback and things get cleaned up iii) Then the QMI request returns and discover_callback gets called even though the request has timed out in ii) ...and this is where things go wrong because the userdata pointer to discover_callback is probably no longer valid. How do we handle the QMI request returning a _late_ response, i.e. after it technically has timed out? I'll dig a bit more... /Jonas Hi Jonas, When I look at my personal patches, it seems I've already seen that. Please find attached the patch I currently have in my setup on this subject. Yes, that's exactly what I was just in the process of implementing. Glad you beat me to it. :) I tested your patch and it solves the problem. Can you submit it to the list? If not, I will... :) I think service_create_reply() has the same issue but I don't hit it in my setup.. Eswaran: try the patch from Christophe... I'm 99% certain it solves your issue. /Jonas Hi, Sorry, I couldn't able to run GDB on my test bench. Hence, not able to provide the necessary core dumps. I applied the patch you had provided. This fixes the issue during enabling the modem. The ofono is running fine when I run enable-modem. But I am seeing some other issues. After starting the system, I am running the scripts when I identify the modem device and ofono service is in active state. /enable-modem /online-modem /list-modems --> here I am checking the ofono sim interface for SIM card status. The ofono is reporting that SIM is not present even though the SIM card is attached to the system /offline-modem -> the oFono process gets exited. I have attached the ofono debug messages. I will send the gdb backtrace logs as soon as possible. Regards, vinoth