[Bug 1882123] Re: ARM cpu emulation regression on QEMU 4.2.0

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/271


** Changed in: qemu
       Status: Confirmed => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #271
   https://gitlab.com/qemu-project/qemu/-/issues/271

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https://bugs.launchpad.net/bugs/1882123

Title:
  ARM cpu emulation regression on QEMU 4.2.0

Status in QEMU:
  Expired

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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