stratux process fails to start

[shayfrendt]

I'm experiencing a somewhat difficult to debug scenario wherein the end result is that I can connect to the stratux wifi network, but cannot see a supported device connected in ForeFlight:

Here are the device components and versions I'm running:

Component	Version
Raspberry Pi	Model B Revision 2.0
NooElec	NESDR Mini 2
Edimax	EW-7811Un
iPad	A1416
iOS	9.1
stratux	v0.5b1
ForeFlight	7.5

When I ssh'd into the device, I was able to get a decent ways down the call stack, but not far enough to know what line of code was causing the root issue:

$ ssh pi@192.168.10.1
$ ps aux | grep stratux
pi        2313  0.0  0.3   3548  1596 pts/0    S+   00:06   0:00 grep --color=auto stratux

$ stratux
$ echo $?
0

$ cat /usr/bin/stratux
#!/bin/bash

screen -S stratux -d -m /usr/bin/start_uat

$ /usr/bin/start_uat
/usr/bin/start_uat: line 3:  2305 Illegal instruction     /usr/bin/gen_gdl90

$ /usr/bin/gen_gdl90
Illegal instruction

One thing I noticed above is that although the start_uat script exits with a non-zero status code, the stratux script seems to be swallowing that error and failing silently. Perhaps it's the way the screen session is being invoked?

I dropped into a gdb session to see if I could get any more info:

$ gdb /usr/bin/gen_gdl90
(gdb) run
Starting program: /usr/bin/gen_gdl90
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

Program received signal SIGILL, Illegal instruction.
runtime.check () at /root/go/src/runtime/runtime1.go:146
146 /root/go/src/runtime/runtime1.go: No such file or directory.

I'm definitely not a Go engineer: is this indicative of any deeper issue? Or is there perhaps something I'm misconfiguring with my setup? Any help is appreciated!

Oh, and thanks for this awesome project! :zap: :airplane: :metal:

[cyoung]

Hi Shay, thanks for starting to troubleshoot and including the info that you did in this ticket.

Could you paste the output of "cat /proc/cpuinfo", please?

[shayfrendt]

No problemo! :bow:

$ cat /proc/cpuinfo
processor   : 0
model name  : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS    : 2.00
Features    : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part    : 0xb76
CPU revision    : 7

Hardware    : BCM2708
Revision    : 000e
Serial      : 000000005c257558

I'm using the wrong hardware, aren't I...

I totally missed that there were like tail numbers on frequency:

• Raspberry Pi Model B Revision 2.0
• Raspberry Pi 2 Mobel B

I stared at the Pi 2 requirement on the README for like 5 minutes, too. But was like "yeah I totally have an old raspberry pi layin around".

[cyoung]

There you go :+1:

You can try "make; make install" in /root/stratux to recompile - the older RPi are ARMv6 procs. Should work alright, but the RPi 2 is only supported now. Recommend getting one of those.

[dalfry]

Running the same hardware. R-Pi B+.

Tried a make in /root/stratux, it fails with -

Makefile:8: recipe for target 'all' failed make: *\ [all] Illegal instruction

[cyoung]

Not too sure what that one is, you might want to hook it up to ethernet and apt-get update / apt-get upgrade. Or just get a new Pi2 ... they are quite a bit faster.