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pick #6481

This fixes a concurrent map panic when mounting a snapshot through the
filesystem API.

This adds a global mutex around the mounts to prevent concurrent writes
to the map.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
(cherry picked from commit a02e65e)
@tonistiigi tonistiigi merged commit 2bcd66d into moby:v0.27 Jan 21, 2026
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2 participants