FDS multiple GC completed events and crash

RE: FDS multiple GC completed events and crash

Justin — Tue, 12 Sep 2017 17:54:49 GMT

it would be really nice if peer manager could be used without fds if desired (ram only).

i will close this item, since i believe sdk 12.3 actually fixed the fds issue i was seeing.

i think the resulting issue was due to the freertos timer task priority.

thanks for the assistance.

RE: FDS multiple GC completed events and crash

MartinBL — Tue, 12 Sep 2017 11:31:04 GMT

Unfortunately peer manager thinks that it is in the same application context or softdevice event context, but with freertos it can be in any context. So it is still not thread safe.

RE: FDS multiple GC completed events and crash

Justin — Mon, 11 Sep 2017 23:28:08 GMT

thanks for the update.

i'll look at the SDK14 changes.

i'm not using FDS outside of peer manager.

RE: FDS multiple GC completed events and crash

MartinBL — Mon, 11 Sep 2017 08:46:53 GMT

According to the SDK team, FDS is not thread safe and hence, when using FreeRTOS it might not work as intended. Make sure that FDS always works within critical region by using some sort of mutual exclusion techniques.

Furthermore, there is a bug fix in SDK 14 that might be relevant. You can try to port FDS from SDK 14 back to SDK 12.3.

RE: FDS multiple GC completed events and crash

Justin — Thu, 07 Sep 2017 16:26:59 GMT

Yes, I've been able to speed up the reset.

However, using SDK 12.3, I'm not seeing the FDS GC before the WDT reset. The RTT log posted above was from 12.1.

I've been able to break into the debugger when the crash occurs and usually it is in vApplicationStackOverflowHook.

Currently attempting to locate the cause. Any suggestions?

Thanks!

RE: FDS multiple GC completed events and crash

MartinBL — Thu, 07 Sep 2017 09:05:26 GMT

Strange. Any luck in speeding things up?

RE: FDS multiple GC completed events and crash

Justin — Fri, 01 Sep 2017 16:39:47 GMT

i clear RESETREAS (by writing 0xFFFFFFFF) after reading it when the device starts. i will try to make this issue happen more quickly.

RE: FDS multiple GC completed events and crash

MartinBL — Fri, 01 Sep 2017 13:46:32 GMT

Are you sure that it is the WDT that causes the final reset? RESETREAS = 0x6 indicates both a WDT reset and a System reset (the register is probably not cleared between the two events). Is it possible that your application does a system reset on a function assert? Have you tried debugging like this?

Could you try to speed up the use of the peer manager to see if we can reproduce quicker?

Maybe it is an idea to clear the RESETREAS register at application startup too, to pinpoint the actual reset reason.