Consistent kernel panics when using timer

RE: Consistent kernel panics when using timer

Midhunjac — Mon, 02 Jan 2023 14:14:46 GMT

Hi,

I solved the issue couple of days before employing the workqueue for PTH_update(). Thank you for responding though. So sorry that I forgot to close the case.I will mark your answer as solution and close the case right away. Thanks again.

RE: Consistent kernel panics when using timer

Jared — Mon, 02 Jan 2023 14:11:03 GMT

Hi,

Sorry for the late reply.

If you comment out PTH_update() do you still get the error? I'm not totally sure if it's LedManager_TimerCallback() or PTH_update() that causes the issue, but the error message indicates that you're getting an error because you're trying to grab a semaphore while in a interrupt context. Try putting whatever task that is causing the issue into a workqueue.

regards

Jared

RE: Consistent kernel panics when using timer

Midhunjac — Fri, 23 Dec 2022 13:32:46 GMT

I think I found out the issue is. But Cannot figure out why this is happening. To reproduce the issue, execute the following steps in order.

Create a timer and corresponding expiry callback function. At the timer expiry, fetch data from sensors.

K_TIMER_DEFINE(m_global_timer,timer_expiry_cb,timer_stop_cb);
k_timer_expiry_t timer_expiry_cb()
{
    expiry_counter++;
    LedManager_TimerCallback();
    if(expiry_counter%5 == 0)
    {
        PTH_update();
    }
}

/*<The following function PTH_update() is in another file originally. Moved here for convenience>*/
void PTH_update()
{   
		sensor_sample_fetch(dev);
		sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
		sensor_channel_get(dev, SENSOR_CHAN_PRESS, &press);
		sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &humidity);
}

The crash happens only when I try to fetch the sensor values. Otherwise, it works fine. So, I believe it has something to do with timer expiry and reading sensor values API.
Thanks for taking a look at this.

RE: Consistent kernel panics when using timer

Jared — Fri, 23 Dec 2022 13:25:53 GMT

Hi there,

Can you share a minimal example that reproduces the issue on the development kit?

regards

Jared