[lwip-users] When the TCP_MSG have been exhausted, it could not be recovered.

[geckook Xu]

When the tcp_pcb have been exhausted,will meet the problem listed below.
Assertion "tcp_input: active pcb->state != CLOSED" at line 170 in tcp_in.c
below code is locate in tcp_in.c lines 602
pcb->state = CLOSED;

There are the only reason which make assert "tcp_input: active
pcb->state != CLOSED".

Why assert here? or what's reason will lead to the assertion?

There are still anothe problem when the tcp_pcb have been exhausted:
I set TCP_MSG to 255, and when the tcp_pcb are exhausted, it will be
exhausted too.
once TCP_MSG have been exhausted,then TCP_MSG values would not be recovered.
What should I do now?