Caddy: Illegal instruction on Asus RT-AC68U router

[Enver-Yilmaz]

1. What version of Caddy are you using (caddy -version)?

Website says 10.0.6, caddy -version gives "illegal instruction"

2. What are you trying to do?

this is my first try to run Caddy on Asus RT-AC68U router with custom "Merlin" firmware. uname output is
"Linux router 2.6.36.4brcmarm #2 SMP PREEMPT Sun Jul 16 13:04:40 EDT 2017 armv7l ASUSWRT-Merlin"
I tried both Linux ARMv7 and ARMv6 versions of caddy. For your information I successfully run portainer which is build with golang on this platform.

3. What is your entire Caddyfile?

there's no caddy file yet

4. How did you run Caddy (give the full command and describe the execution environment)?

caddy - version

5. Please paste any relevant HTTP request(s) here.

6. What did you expect to see?

7. What did you see instead (give full error messages and/or log)?

Illegal instruction

8. How can someone who is starting from scratch reproduce the bug as minimally as possible?

To reproduce this you need an Asus RT series router hardware with stock or "merlin" firmware

[mholt]

Uhhh, huh, that's weird. I don't have that router (or access to one, that I know of) so you'll have to help out a bit!

Do you have any experience with gdb? Could you possibly run it with gdb and see if we can find the area where it's crashing?

[Enver-Yilmaz]

I have no experience with gdb. I tried "gdb caddy" but it raised an error about autoload scripts.
I can go further and figure out how to use gdb or I can give you ssh access to my router. Which one do you prefer?

[wader]

Could it be something similar to https://github.com/golang/go/issues/18483 ?

[Enver-Yilmaz]

@wader
Yes that's it. Either CPU or kernel doesn't has cpu support. I tried armv5 and it works. Here is /proc/cpuinfo

Processor : ARMv7 Processor rev 0 (v7l)
processor : 0
BogoMIPS : 1599.07

processor : 1
BogoMIPS : 1595.80

Features : swp half thumb fastmult edsp
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0

Hardware : Northstar Prototype
Revision : 0000
Serial : 0000000000000000

I actually tried to download armv5 with curl before but I guess I didn't give download server to enough time to compile before download and I thought download is broken. I did wait this time and took 58 seconds to compile and download.

[wader]

👍