I pinpointed the exact commits which affected the regression. [QEMU 4.2.0-rc0 : illegal hardware instruction] - Introduced in commit af28822 https://github.com/qemu/qemu/commit/af2882289951e58363d714afd16f80050685fa29 The commit affected LDREX/STREX translation, and broke dotnet command from .NET Core SDK.
[QEMU 4.2.0-rc2 : .NET SEHException] - Introduced in commit 655b026 https://github.com/qemu/qemu/commit/655b02646dc175dc10666459b0a1e4346fc8d46a The commit fixes STREX a bit. As a result, dotnet command is now executable except JIT compiling. I also tested lastest HEAD from the master, and it still has the SEHException regression. (Tested commit is 66234fee9c2d37bfbc523aa8d0ae5300a14cc10e) -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1882123 Title: ARM cpu emulation regression on QEMU 4.2.0 Status in QEMU: New 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 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1882123/+subscriptions
