This is due to a kernel bug where the fact that a socket is
marked non-blocking is ignored. It is reported that setting
xfrm_larval_drop to 1 helps but this may have negative side effects.
For more information, see:
xfrm_larval_drop can be set to 1 by the following procedure:
echo "1" > proc/sys/net/core/xfrm_larval_drop
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