Public bug reported:
Running QEMU with the max CPU model causes the AArch64 UEFI firmware to
hang:
qemu-system-aarch64 \
-machine virt \
-cpu max \
-m 2G \
-smp 2 \
-bios /usr/share/qemu-efi-aarch64/QEMU_EFI.fd \
-nographic
Output:
UEFI firmware (version 2025.11-3ubuntu7.2 built at 14:10:51 on Aug 26
2026)
The firmware hangs at this point.
With -d int enabled for debugging, the following exception is reported
continuously:
Taking exception 3 [Prefetch Abort] on CPU 0
...from EL1 to EL1
...with ESR 0x21/0x86000006
...with FAR 0x5200
...with SPSR 0x23c5
...with ELR 0x5200
...to EL1 PC 0x5200 PSTATE 0x23c5
For comparison, the issue is not observed when using -cpu neoverse-v1 or
other CPU models instead of -cpu max.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: qemu-efi-aarch64 2025.11-3ubuntu7.2
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
Date: Mon Sep 21 15:46:44 2026
InstallationDate: Installed on 2025-07-21 (427 days ago)
InstallationMedia: Ubuntu-Server 25.04 "Plucky Puffin" - Release amd64
(20250415.2)
PackageArchitecture: all
ProcEnviron:
LANG=C.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=alacritty
XDG_RUNTIME_DIR=<set>
SourcePackage: edk2
UpgradeStatus: Upgraded to resolute on 2026-04-25 (149 days ago)
** Affects: edk2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2167864
Title:
EDK2 hangs when launched with qemu-system-aarch64 -cpu max
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