** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2002427
Title:
Subiquity segfault in ARM64 with -64k Kernel
Status in subiquity:
New
Status in linux package in Ubuntu:
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
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