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![Josh Bleecher Snyder](/assets/img/avatar_default.png)
We can't access b.netMap without holding b.mu. We already grabbed it earlier in the function with the lock held. Introduced in Nov 2020 in 7ea809897df1764ea420be2ff6ae58459b0e6902. Discovered during stress testing. Apparently it's a pretty rare? Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>