containerd 2.2 mount manager slower and buggier than manual disk setup

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A developer benchmarked containerd 2.2's new mount manager against a manual four-command sequence for formatting and attaching a 200MiB ext4 image as a loopback device. The mount manager's Activate call took between 29.6ms and 47.2ms per run, while the manual approach consistently finished in 23.5 to 25.9ms. Beyond being slower, the manager also panicked once, leaked a raw BoltDB error, and left an orphaned loop device that could not be recovered. The overhead stems from BoltDB writes, symlink creation, and bookkeeping rather than any difference in the underlying formatting tools, since the manager shells out to the same mkfs.ext4 binary as the manual path. The mount manager is designed for composability within snapshotters and runtime shims, not for raw performance, and the developer tested against containerd v2.2.2 bundled with Docker Engine 29.3.1.

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