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Fix KASSERT during tcp_newtcpcb when low on memory

Authored by rscheff on Jul 6 2020, 9:56 PM.



While testing with system default cc set to cubic, and
running a memory exhaustion validation, FreeBSD panics for a
missing inpcb reference / lock.

Test Plan

Modify modular CC, to return ENOMEM during the _cb_init() function;
load modified CC, and temporarily switch to it as default CC.
Validate that a new session fails with "socket: No buffer space available", instead of a kernel panic (kassert).
Unset the modified CC as default algorithm.

Diff Detail

Lint OK
No Unit Test Coverage
Build Status
Buildable 32174
Build 29675: arc lint + arc unit