RC Inputs & Outputs freeze (crashlog)

[simon88]

Bug report

Issue details
I suffered a RC In and Out freeze caused a crash on my hexa copter. Old issue with the same problem #5859

Version
4.2.2

Platform
[ ] All
[ ] AntennaTracker
[x] Copter
[ ] Plane
[ ] Rover
[ ] Submarine

Airframe type
Hexacopter

Hardware type
Cube Black

Logs
https://drive.google.com/file/d/11bzhfpx8oTY5SzQqDWa90Ej0akxuVKjA/view?usp=sharing

[IamPete1]

IOMCU failed, hard to say why.

[simon88]

it's frustrating to crash an expensive drone and not know why... Something that I find strange is that all the old bugs which are the "same", all are on hexa copters, no on quad...

[ludoplt]

#5859 -> same bug on hexarotor
#6127 -> same bug on hexarotor
https://discuss.ardupilot.org/t/rcout-freezes-during-the-flight-iomcu-reset/78207 -> same bug on helicopter with 6 outputs

Is it a coincidence that the bug always appears on hexa ?

[IamPete1]

Is it a coincidence that the bug always appears on hexa ?

Yes

There are some more steps we could take to debug, the subsequent log would tell us if there was a watchdog reboot. You could test if the IOMCU works now, or if it is permanently broken.

[simon88]

Yep @IamPete1 the IOMCU works right now, I've no PreArm message or something else, but I don't want take the risk to take off again with this cube and crash again.