** No longer affects: linux (Ubuntu)
** Also affects: snapcraft
Importance: Undecided
Status: New
** Summary changed:
- Subiquity segfault in ARM64 with -64k Kernel
+ classic snaps do not work on ARM64 kernel configured to use 64k pages
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https://bugs.launchpad.net/bugs/2002427
Title:
classic snaps do not work on ARM64 kernel configured to use 64k pages
Status in Snapcraft:
New
Status in subiquity:
New
Bug description:
[Problem Description]
Subiquity fails to execute when running on ARM64 with -64k Kernel. It
exits with the "Segmentation fault" message
[Additional Info]
The problem seems to be with python3.8 binary in the snap. The same
problem occurs with wget binary in the same snap, but ubuntu-distro-
info works fine. Both python3.8 and wget are statically compiled,
while ubuntu-distro-info is not.
root@jammy-arm:~# file /snap/subiquity/4236/usr/bin/python3.8
/snap/subiquity/4236/usr/bin/python3.8: ELF 64-bit LSB executable, ARM
aarch64, version 1 (SYSV), dynamically linked, interpreter
/snap/core20/current/lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0,
BuildID[sha1]=bad3f5d001ec1e2ec539f16d8f6729a06cdd68df, stripped
root@jammy-arm:~# /snap/subiquity/4236/usr/bin/python3.8
Segmentation fault
root@jammy-arm:~# ldd /snap/subiquity/4236/usr/bin/python3.8
not a dynamic executable
root@jammy-arm:~# file /snap/subiquity/4236/usr/bin/wget
/snap/subiquity/4236/usr/bin/wget: ELF 64-bit LSB pie executable, ARM
aarch64, version 1 (SYSV), dynamically linked, interpreter
/snap/core20/current/lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0,
BuildID[sha1]=0f2234825d67c22b6b320139445759f6662aa01e, stripped
root@jammy-arm:~# /snap/subiquity/4236/usr/bin/wget
Segmentation fault
root@jammy-arm:~# ldd /snap/subiquity/4236/usr/bin/wget
not a dynamic executable
root@jammy-arm:~# file /snap/subiquity/4236/usr/bin/ubuntu-distro-info
/snap/subiquity/4236/usr/bin/ubuntu-distro-info: ELF 64-bit LSB pie
executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter
/snap/core20/current/lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0,
BuildID[sha1]=5d8c4c52d7ce614024eba1ba9069e48ad4192508, stripped
root@jammy-arm:~# /snap/subiquity/4236/usr/bin/ubuntu-distro-info
ubuntu-distro-info: You have to select exactly one of --all, --devel,
--latest, --lts, --stable, --supported, --supported-esm, --series,
--unsupported.
root@jammy-arm:~# ldd /snap/subiquity/4236/usr/bin/ubuntu-distro-info
linux-vdso.so.1 (0x0000fffe72270000)
libc.so.6 => /snap/core20/current/lib/aarch64-linux-gnu/libc.so.6
(0x0000fffe720b0000)
/snap/core20/current/lib/ld-linux-aarch64.so.1 =>
/lib/ld-linux-aarch64.so.1 (0x0000fffe72280000)
The same VM, using the non -64k kernel works:
# uname -a
Linux jammy-arm 5.15.0-27-generic #28-Ubuntu SMP Thu Apr 14 12:56:31 UTC 2022
aarch64 aarch64 aarch64 GNU/Linux
# /snap/subiquity/4236/usr/bin/python3.8 -c "print('Works')"
Works
Tried other kernels (5.17, 5.19) with the same error.
[Reproducer]
1. Run a VM in ARM64 architecture:
virt-install --arch aarch64 --boot uefi --osinfo detect=on,require=off --name
jammy-arm --memory 8096 --vcpus 4
--disk=jammy-server-cloudimg-arm64.img,bus=virtio
--disk=jammy-arm-seed.qcow2,bus=virtio --network network=default,model=virtio
--boot hd --noautoconsole
2. Connect to the VM and install a -64k kernel
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/bootstrap/+build/23546569
3. Reboot in the kernel (I disabled secure boot)
# uname -a
Linux jammy-arm 5.15.0-27-generic-64k #28-Ubuntu SMP Thu Apr 14 19:01:31 UTC
2022 aarch64 aarch64 aarch64 GNU/Linux
4. Install subiquity
sudo snap install subiquity
5. Try to run it
# /snap/bin/subiquity
Segmentation fault
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jan 10 18:24 seq
crw-rw---- 1 root audio 116, 33 Jan 10 18:24 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: arm64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: unknown
DistroRelease: Ubuntu 22.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 480M
MachineType: QEMU QEMU Virtual Machine
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-27-generic-64k
root=UUID=a6c92eea-e1ae-4ec4-9fbc-69e3ab11d0f7 ro console=tty1 console=ttyS0
ProcVersionSignature: Ubuntu 5.15.0-27.28-generic-64k 5.15.30
RelatedPackageVersions:
linux-restricted-modules-5.15.0-27-generic-64k N/A
linux-backports-modules-5.15.0-27-generic-64k N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: jammy uec-images
Uname: Linux 5.15.0-27-generic-64k aarch64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 02/06/2015
dmi.bios.release: 0.0
dmi.bios.vendor: EFI Development Kit II / OVMF
dmi.bios.version: 0.0.0
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: virt-6.2
dmi.modalias:
dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:br0.0:svnQEMU:pnQEMUVirtualMachine:pvrvirt-6.2:cvnQEMU:ct1:cvrvirt-6.2:sku:
dmi.product.name: QEMU Virtual Machine
dmi.product.version: virt-6.2
dmi.sys.vendor: QEMU
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