Brad Fitzpatrick 121f5a00f7 wgengine/magicsock: fix DERP reader hang regression during concurrent reads
Fixes #1282

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit 6b365b02396b54536cb40dbbe235433493874935)
2021-02-08 14:39:02 -08:00
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