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Extracting core dumps when running Spectrum in a VM

When using a VM to run the Spectrum host system, a special mechanism is available to enable easy introspection of core files.

When a program on the Spectrum host system dumps core, the system will attempt to upload the core file to its host (i.e. the system running Spectrum in a VM) using the vsock(7) protocol, on port 1129271877.

For example, when running Spectrum in a VM using make run in the host/rootfs directory (which automatically sets up a virtio-vsock device), the running this command on the development Linux system will listen for a core file from Spectrum, and write it to a file:

socat -u VSOCK-LISTEN:1129271877 CREATE:spectrum.core