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

[Oleg Kobrin]

URL:
  <https://savannah.nongnu.org/bugs/?58986>

                 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

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Details:

Hello!

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.




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