bitwalker / bitwalker/swarm

Swarm.Tracker stuck in `syncing` state when lots of nodes starting/crashing

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Description

I can't reproduce this on reliably, but I've noticed that occasionally `Swarm.Tracker` gets stuck in the `syncing` state when a lot of nodes are crashing & restarting.

Based on inspecting the process on each surviving node last time I saw it, it looks like they are stuck in the `syncing` state, and have a list of `pending_sync_requests`, including PIDs from nodes no longer in the cluster. (I think)

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