** Changed in: qemu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1882123
Title:
ARM cpu emulation regression on QEMU 4.2.0
Status in QEMU:
Confirmed
Bug description:
[*] Summary
Latest QEMU has an ARM CPU emulation regression.
Regression is reproducible by building any C# project with .NET Core SDK
3.1.300 on Debian 10 armhf guest OS.
Releases affected: QEMU 4.2.0, 5.0.0
Releases not affected: QEMU 4.1.0, QEMU 4.1.1
[*] Detail
.NET Core SDK 3.1 fails to run on Debian 10 emulated by qemu-system-
arm.
I occasionally test my C# projects on the virtual armhf/arm64 system
emulated by QEMU. MSBuild, a build engine of the .NET Core SDK,
crashes on QEMU 4.2.0 or later. The crash only happens when MSBuild
tries to do any JIT compiling (dotnet build / dotnet test).
I attached the MSBuild crash logs. MSBuild always crashes with
SEHException, which means it tried to call C binary from .NET binary.
I think the ARM CPU emulation regression happened between QEMU 4.1.1 ~
4.2.0. The issue affects QEMU 4.2.0 and 5.0.0. QEMU 4.1.0, 4.1.1, and
real Raspberry Pi 2 are not affected by this issue, and .NET Core SDK
works completely fine.
[*] Environment
[Host OS]
Distribution: Linux Mint 19.3 amd64
CPU: AMD Ryzen 5 3600
Kernel: Ubuntu 5.3.0-51-generic
[QEMU Guest OS]
Distribution: Debian 10 Buster armhf
Kernel: Debian 4.19.0-9-armmp-lpae
.NET Core SDK: 3.1.300
[Raspberry Pi 2]
Distribution: Raspberry Pi OS Buster armhf
Kernel: 4.19.118-v7+
[Tested C# Projects]
This is a list of C# projects I have tested on QEMU and RPI2.
- https://github.com/ied206/Joveler.DynLoader
- https://github.com/ied206/Joveler.Compression
- https://github.com/ied206/ManagedWimLib
[QEMU Launch Arguments]
qemu-system-arm \
-smp 3 -M virt -m 4096 \
-kernel vmlinuz-4.19.0-9-armmp-lpae \
-initrd initrd.img-4.19.0-9-armmp-lpae \
-append "root=/dev/vda2" \
-drive if=none,file=debian_arm.qcow2,format=qcow2,id=hd \
-device virtio-blk-device,drive=hd \
-netdev user,id=mynet,hostfwd=tcp::<PORT>-:22 \
-device virtio-net-device,netdev=mynet \
-device virtio-rng-device
[QEMU Configure Arguments]
./configure --enable-spice --enable-gtk --enable-vnc-jpeg --enable-vnc-png
--enable-avx2 --enable-libusb --enable-opengl --enable-virglrenderer
--enable-kvm --enable-system --enable-modules --audio-drv-list=pa
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