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udp: Fix soroverflow SOCKBUF unlocking
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Authored by kbowling on Aug 1 2021, 2:54 PM.

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Summary

Author: Konstantin Kukushkin <darkdestructor@rambler.ru>

We hold the SOCKBUF_LOCK so use soroverflow_locked here.
This bug may manifest as a non-killable process stuck in [*so_rcv].

Reviewed by:    Roy Marples <roy@marples.name>
Fixes:  7045b1603bdf
MFC after:  10 days

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R10 FreeBSD src repository
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