[Bug 212716] recv() with MSG_WAITALL doesn't always unblock on EOF

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212716

Greg Becker <greg@codeconcepts.com> changed:

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--- Comment #12 from Greg Becker <greg@codeconcepts.com> ---
Created attachment 244557
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=244557&action=edit
sockets: re-check socket state after call to pr_rcvd()

I tested the KASSERT in sbwait without the fix to soreceive_generic() and it
panics as expected.  I am now currently running kyua test to evaluate the
before/after results.

I'm not too worried about the apparent double test of (sb_mb == NULL), as I
suspect the optimizer will eliminate the redundant test.

I still haven't fully evaluated whether all data in the socket will be fully
delivered before any socket errors or closed states are acted upon.

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