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[lwip-devel] [bug #58986] Hard fault inside tcp_output()

From: Oleg Kobrin
Subject: [lwip-devel] [bug #58986] Hard fault inside tcp_output()
Date: Thu, 20 Aug 2020 09:26:59 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36


                 Summary: Hard fault inside tcp_output()
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: kiabrin
            Submitted on: Чт 20 авг 2020 13:26:56
                Category: IPv4
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 1.4.1




I work on project using Tiva C MCU (ARM Cortex M4F) and lwip port supplied by

The device have constant traffic via TCP/IP with third-party device. Rarely I
face a hard fault exception caused by code inside tcp_output() function, in
line 1022

useg = useg->next;

and I see useg->next is 0x363BCB17, which is out of memory range. 

Currently project is in debug state, stopped at this line, so I can browse any
variables and memory.


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