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Differential D12772

Prevent bge_init and bge_rxeof from running in parallel
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Authored by rstone on Oct 24 2017, 3:53 AM.
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Summary

Fix a race that allowed bge_rxeof to send an mbuf up the stack
while another thread running bge_init was freeing it. This would
lead to a double free of the mbuf and potential memory corruption.

MFC after: 1 week
Sponsored by: Dell EMC Isilon

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Buildable 12197
Build 12495: arc lint + arc unit

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sys/
dev/
bge/
4 lines

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sys/dev/bge/if_bge.c

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