The user reports that after upgrading from QEMU 2.7.0 to 2.8.0, the Ctrl-A B command (used to send a break signal to the VM) no longer works on their NetBSD amd64 system. Other Ctrl-A sequences are functioning correctly, and reverting to the previous version resolves the issue. This indicates that the problem is specific to the new version and likely related to how QEMU handles runtime inputs or commands.

Given that this is an issue occurring during runtime when using a specific command, it falls under the **runtime** category rather than being related to faulty instructions or system calls.

Runtime