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+id = 1659
+title = "x86 vm fails to stop on Darwin aarch64 when qemu compiled with -O1/-O2"
+state = "closed"
+created_at = "2023-05-17T18:19:05.804Z"
+closed_at = "2023-06-25T08:25:34.498Z"
+labels = ["accel: TCG", "host: arm", "hostos: macOS", "target: i386"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1659"
+host-os = "MacOS Ventura 13.3.1 (a)"
+host-arch = "ARM64"
+qemu-version = "8.0.0"
+guest-os = "Ubuntu 20.04"
+guest-arch = "x86"
+description = """When compiled with `-O2` or `-O1` qemu process hangs on full VM stopping on macOS aarch64 host if `shutdown -P now` initiated from guest system."""
+reproduce = """1. Compile latest qemu version with -O2 (default value) or -O1 passed 
+2. Run qemu-system-x86_64 with ubuntu image, e.g. https://cloud-images.ubuntu.com/focal/20230215/focal-server-cloudimg-amd64.img and custom cloud-init (for user/password authentication)
+3. Wait until image is loaded, connect via vnc or provide login/password in stdio
+4. Initiate shutdown with `sudo shutdown -P now`
+5. See that VM indefinitely shutdowns
+6. Kill VM from host system with kill -9 <qemu-system-x86_64-process-pid>
+7. Recompile qemu with -O0
+8. Repeat steps 2-4
+9. See that vm successfully stopped, and qemu process exited with code 0"""
+additional = """I've created thread dump from activity monitor with threads which qemu hanging on, attached below
+[sample-qemu-system-x86_64.txt](/uploads/119b89b7f55f4374acb9ae1f9dc2e517/sample-qemu-system-x86_64.txt)
+
+Probably there is some compiler optimisation which prevents qemu threads from receive shutdown signal or appropriate notification from another threads.
+
+The compiler version with which qemu is built:
+```bash
+% cc --version
+Apple clang version 14.0.3 (clang-1403.0.22.14.1)
+Target: arm64-apple-darwin22.4.0
+Thread model: posix
+InstalledDir: /Library/Developer/CommandLineTools/usr/bin
+```"""