Snap fails on ARM64 architecture (Error: bad light userdata pointer)

[dstan82]

EDIT: Refer #6 (comment) for the exact problem.

I'm trying to run it from Raspberry Pi 3 with Ubuntu Mate:

Linux rp3b2-inc 4.4.38-v7+ #938 SMP Thu Dec 15 15:22:21 GMT 2016 armv7l armv7l armv7l GNU/Linux

snap run mari0
cannot apply seccomp profile: Invalid argument

any idea ?

[brlin-tw]

Please run the snap version command in a terminal and paste the output.

[dstan82]

dragos@rp3b2-inc:~$ snap version
snap    2.42.5
snapd   2.42.5
series  16
ubuntu  16.04
kernel  4.4.38-v7+

[brlin-tw]

kernel 4.4.38-v7+

This kernel distribution lacks features required for snap apps to function, refer: Cannot apply seccomp profile using hello-world - other - snapcraft.io, according to the discussion thread you should use the kernel shipped by the linux-raspi2 package instead.

[dstan82]

Well, i changed to latest Ubuntu for Pi 3, still no luck :| :

ubuntu@ubuntu:~$ uname -a
Linux ubuntu 5.3.0-1017-raspi2 #19-Ubuntu SMP Thu Jan 16 18:25:50 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@ubuntu:~$ snap version 
snap    2.42.5
snapd   2.42.5
series  16
ubuntu  19.10
kernel  5.3.0-1017-raspi2
ubuntu@ubuntu:~$ mari0 
Error: bad light userdata pointer
stack traceback:
	[string "boot.lua"]:637: in function <[string "boot.lua"]:633>
	[C]: at 0xffff947060d4
	[C]: in function 'require'
	[string "boot.lua"]:416: in function <[string "boot.lua"]:311>
	[C]: in function 'xpcall'
	[string "boot.lua"]:645: in function <[string "boot.lua"]:639>
	[C]: in function 'xpcall'
ubuntu@ubuntu:~$ 

[brlin-tw]

The problem seems to be in LuaJIT: fix lightud for 48bit virtual address by zhongweiy · Pull Request #230 · LuaJIT/LuaJIT, I'll check if there's anything can be done to deal this.

[brlin-tw]

The fix in the corresponding LOVE game engine:
rude / love / commit / 7bbb7c17ad28 — Bitbucket, which is landed in version 11.3.

I can try to build a version for it, however the new version may not be compatible with Mari0 thus no guarantees.

[dstan82]

Thanks, i think i'll try another distro, maybe Ubuntu Mate with raspi2 kernel.
Ubuntu server + xubuntu-desktop moves incredibly slow on Raspberry 3...

[brlin-tw]

This is a bug in the snap's dependencies, I doubt it will be resolved by switching a distro. Feel free to try though.

[dstan82]

Ok, i changed to Ubuntu Mate 18.04.2 (Bionic)

delivery@delivery-desktop:~$ uname -a
Linux delivery-desktop 4.15.0-1032-raspi2 #34-Ubuntu SMP PREEMPT Wed Feb 6 11:50:42 UTC 2019 armv7l armv7l armv7l GNU/Linux
delivery@delivery-desktop:~$ snap version 
snap    2.42.5
snapd   2.42.5
series  16
ubuntu  18.04
kernel  4.15.0-1032-raspi2

Now it's working.

[brlin-tw]

👍 Cheers!

[brlin-tw]

armv7l armv7l armv7l

I noticed that you've switched to a 32 bit distro, that explains why the snap is functional after the switch.

[dstan82]

yes i did. cheers!