deploy anbox cloud on huawei hi1616 arm cpu failed

[TianJinkun]

I'm trying to deploy anbox cloud to my server with Huawei hi1616 ARM CPU installed, but I got an error:
status: error
error: Failed to bootstrap Juju controller
update-available: false
reboot-needed: false
version: 1.22.1

An error occurred while bootstrapping the Anbox Cloud Appliance.

You can find more information about the failure in the log file at
/var/snap/anbox-cloud-appliance/common/logs/bootstrap.log

You can either file a bug report at https://bugs.launchpad.net/anbox-cloud/+filebug
or ask for help at https://discourse.ubuntu.com/c/anbox-cloud

I tried ubuntu 20.04 and ubuntu 22.04, but I got this error.the error log is in the attachment.and here is my lscpu info:
husky@aic:~$ lscpu
Architecture: aarch64
  CPU op-mode(s): 32-bit, 64-bit
  Byte Order: Little Endian
CPU(s): 64
  On-line CPU(s) list: 0-63
Vendor ID: ARM
  Model name: Cortex-A72
    Model: 2
    Thread(s) per core: 1
    Core(s) per socket: 32
    Socket(s): 2
    Stepping: r0p2
    BogoMIPS: 100.00
    Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
Caches (sum of all):
  L1d: 2 MiB (64 instances)
  L1i: 3 MiB (64 instances)
  L2: 16 MiB (16 instances)
  L3: 64 MiB (4 instances)
NUMA:
  NUMA node(s): 4
  NUMA node0 CPU(s): 0-15
  NUMA node1 CPU(s): 16-31
  NUMA node2 CPU(s): 32-47
  NUMA node3 CPU(s): 48-63
Vulnerabilities:
  Gather data sampling: Not affected
  Itlb multihit: Not affected
  L1tf: Not affected
  Mds: Not affected
  Meltdown: Not affected
  Mmio stale data: Not affected
  Retbleed: Not affected
  Spec rstack overflow: Not affected
  Spec store bypass: Vulnerable
  Spectre v1: Mitigation; __user pointer sanitization
  Spectre v2: Vulnerable
  Srbds: Not affected
  Tsx async abort: Not affected

[Alexis Janon (ajanon)]

Hi!

Thanks for the report.

Looking through the logs, we can find:

2024-07-14 09:23:06 INFO juju.packaging.manager run.go:88 Running: snap install --channel 4.4/stable juju-db
ERROR failed to start mongo: juju-db snap not installed correctly. Executable /snap/bin/juju-db.mongod
Error: signal: illegal instruction (core dumped)

The error stems from the juju-db snap, which we do not manage.

Thanks!

[Gary.Wang (gary-wzl77)]

When deploying anbox cloud appliance on a VM(Ubuntu22.04|arm64) launched from the MAAS, a similar problem also occurred.
```
Installing Juju machine agent
2024-07-15 09:47:29 INFO juju.cmd supercommand.go:56 running jujud [2.9.42 7b871e782195bdac9c90f8a8f01723cc3e08ab92 gc go1.19.6]
2024-07-15 09:47:30 INFO juju.agent identity.go:22 writing system identity file
2024-07-15 09:47:30 ERROR juju.mongo mongo.go:651 could not set the value of "/sys/kernel/mm/transparent_hugepage/enabled" to "never" because of: open /sys/kernel/mm/transparent_hugepage/enabled: permission denied
2024-07-15 09:47:30 ERROR juju.mongo mongo.go:651 could not set the value of "/sys/kernel/mm/transparent_hugepage/defrag" to "never" because of: open /sys/kernel/mm/transparent_hugepage/defrag: permission denied
2024-07-15 09:47:30 ERROR juju.mongo mongo.go:651 could not set the value of "/proc/sys/net/core/somaxconn" to "16384" because of: "/proc/sys/net/core/somaxconn" does not exist, will not set "16384"
2024-07-15 09:47:30 ERROR juju.mongo mongo.go:651 could not set the value of "/proc/sys/net/core/netdev_max_backlog" to "1000" because of: "/proc/sys/net/core/netdev_max_backlog" does not exist, will not set "1000"
2024-07-15 09:47:30 WARNING juju.mongo mongo.go:481 overwriting args.dataDir (set to /var/lib/juju) to /var/snap/juju-db/common
2024-07-15 09:47:30 INFO juju.mongo mongo.go:486 Ensuring mongo server is running; data directory /var/snap/juju-db/common; port 37017
2024-07-15 09:47:30 WARNING juju.mongo service.go:323 configuring mongod with --noauth flag enabled
2024-07-15 09:47:30 INFO juju.packaging manager.go:103 installing "juju-db" via "snap"
2024-07-15 09:47:30 INFO juju.packaging.manager run.go:88 Running: snap install --channel 4.4/stable juju-db
ERROR failed to start mongo: juju-db snap not installed correctly. Executable /snap/bin/juju-db.mongod
Error: signal: illegal instruction (core dumped)
ERROR failed to bootstrap model: subprocess encountered error code 1
```

[Ian Booth (wallyworld)]

Launchpad builders are used to build all the supported arches - the juju-db snap pulls a pinned upstream mongodb version and builds that with no changes. We do some testing on arm64 on AWS. Off the top of my head, without further investigation, I have no idea what's different with your arm hardware.

[Joseph Phillips (manadart)]

See also:

https://github.com/juju/juju-db-snap/issues/40

https://www.mongodb.com/community/forums/t/core-dump-on-mongodb-5-0-on-rpi-4/115291