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On ARM64 macOS, qemu-system-x86_64 uses TCG (software emulation)
instead of KVM. The isa-debug-exit shutdown request is processed
asynchronously, so the guest vCPU can continue executing after the
first port write. This lets the fallthrough `exit_qemu(Failed)` in
`_start` overwrite the success exit code before QEMU actually shuts
down, causing intermittent test failures with exit code 35 instead
of 33.
Add `loop {}` after each `exit_qemu(Success)` in test runners so
the vCPU spins harmlessly until the shutdown completes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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On ARM64 macOS, qemu-system-x86_64 uses TCG (software emulation) instead of KVM. The isa-debug-exit shutdown request is processed asynchronously, so the guest vCPU can continue executing after the first port write. This lets the fallthrough
exit_qemu(Failed)in_startoverwrite the success exit code before QEMU actually shuts down, causing intermittent test failures with exit code 35 instead of 33.Add
loop {}after eachexit_qemu(Success)in test runners so the vCPU spins harmlessly until the shutdown completes.