buglwIP - A Lightweight TCP/IP stack - Bugs: bug #58986, Hard fault inside tcp_output()


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bug #58986: Hard fault inside tcp_output()

Submitted by:  Oleg Kobrin <kiabrin>
Submitted on:  Thu 20 Aug 2020 01:26:56 PM UTC  
Category:  IPv4 Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
lwIP version:  1.4.1

Thu 20 Aug 2020 05:58:50 PM UTC, comment #1: 

Such faults are most often caused by running 2 consecutive execution contexts in lwIP code (e.g. 2 threads, thread + interrupt). Since this problem is not known AND your version of lwIP is rather old, I'd suspect this is a problem in your port or application (i.e. ask TI).

Simon Goldschmidt <goldsimon>
Project Administrator
Thu 20 Aug 2020 01:26:56 PM UTC, original submission:  


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

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.

Oleg Kobrin <kiabrin>


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