Illegal instruction on Raspberry Pi with arm version

[franzs]

Output of restic version

restic 0.16.1

Problem description / Steps to reproduce

Calling restic 0.16.1 for arm on a Raspberry Pi results in an Illegal instruction.

./restic_0.16.1_linux_arm version
Illegal instruction

More details:

cat /proc/cpuinfo 
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 697.95
Features        : half thumb fastmult vfp edsp java tls 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

uname -a
Linu xxx 6.1.21+ #1642 Mon Apr  3 17:19:14 BST 2023 armv6l GNU/Linux

cat /etc/debian_version 
11.7

Version 0.16.0 runs on the same Raspberry Pi without issues:

./restic_0.16.0_linux_arm version
restic 0.16.0 compiled with go1.20.6 on linux/arm

[JsBergbau]

Same problem with me. The official binary seems not to be build with go run build.go --goos linux --goarch arm --goarm 6

You can use this binary in the meantime. I've just built it from repo with commit from yesterday.

resticARM6.zip

Update: Probably RPi 1 is not used widely anmore, but the popular Raspberry Pi Zero (W) is also uses ARM v6, which makes ARM v6 support so important.

[MichaelEischer]

restic 0.16.0 was built using GOARM=5, whereas restic 0.16.1 uses GOARM=7. This has apparently changed in Go 1.21 https://go.dev/blog/rebuild :

“assume HWFP unless the build is running on an ARM system without floating-point hardware”

Calling restic 0.16.1 for arm on a Raspberry Pi results in an Illegal instruction.

This only affect the Raspberry Pi 1, which only supports the ARMv6 instruction set. All later models support ARMv7.

[MichaelEischer]

#4542 will change the build process to set GOARM=6. I'm a bit undecided whether we should already drop GOARM=5 support for a 0.16.2 release or only in 0.17.0. At least from a semver standpoint the latter would be the way to go.

[franzs]

@MichaelEischer Thanks a lot for your efforts. 😃

[mirabilos]

I’m in the process of setting up an RPi 1 right now, so thanks for keeping it supported ;)