Without propagation, rbind submounts on the host (e.g., XFS zvol at
/srv/kind/solana) are invisible inside the kind node — it sees the
underlying filesystem (ZFS) instead. This causes agave's io_uring to
deadlock on ZFS transaction commits (D-state in dsl_dir_tempreserve_space).
HostToContainer propagation ensures host submounts propagate into the
kind node, so /mnt/solana correctly resolves to the XFS zvol.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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