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Steven Allen authored
This deadlock would happen when calling SessionsForBlock (holding bitswap.sessLk) while the session's main loop was trying to deregister the session (taking bitswap.sessLk). I've also defensively added selects on contexts for two other channel writes just in case. fixes #4394 ...well, it fixes *a* deadlock showing up in that issue, there may be more. License: MIT Signed-off-by:Steven Allen <steven@stebalien.com>
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