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lwip的pbuf_free有点问题 #3248

@Simon-Leung

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@Simon-Leung

pbuf.c里面的pbuf_free函数,650行里的LWIP_ASSERT("pbuf_free: p->ref > 0", p->ref > 0),建立UDP服务端后,以小于1ms间隔不断给RTT系统发送数据,结果就卡在这个assert里了。

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