mqtt sample error. USAGE FAULT and Hardware exception

[MosheSmartAmr]

Build and flash mqtt sample.  Use board nRF9160. Ubuntu 16.04. Firstly flash secure boot, just after that flash mqtt sample.
Have this in terminal:

The MQTT simple sample started

LTE Link Connecting ...

LTE Link Connected!

***** USAGE FAULT *****

  Unaligned memory access

***** Hardware exception *****

Current thread ID = 0x20020244

Faulting instruction address = 0x539fa

Fatal fault in essential thread! Spinning...

As I understand correctly it falls in function static void broker_init(void):

in this line :

getaddrinfo(CONFIG_MQTT_BROKER_HOSTNAME, NULL, &hints, &result);

[Jan Tore Guggedal]

Hi,

you're right that the error originates from this line. It was a bug, and on latest master it's now fixed. You can either pull in latest master branch or make sure that all members of the hints struct are initialized to zero by using memset or the fix in master:
https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/samples/nrf9160/mqtt_simple/src/main.c#L222

Best regards,

Jan Tore