[lwip-devel] [bug #65786] tcpip_init fails LWIP_ASSERT_CORE_LOCKED assertion

[Godmar Back]

URL:
  <https://savannah.nongnu.org/bugs/?65786>

                 Summary: tcpip_init fails LWIP_ASSERT_CORE_LOCKED assertion
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: godmar
               Submitted: Fri 24 May 2024 01:49:59 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.2.0


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 24 May 2024 01:49:59 PM UTC By: Godmar Back <godmar>
I'm trying to use lwip 2.2-STABLE with

#define LWIP_TCPIP_CORE_LOCKING    1

and have implemented the necessary sys_arch functions.

Calling tcpip_init leads to a sequence where the startup sequence fails since
the code asserts that the TCP core lock is held before it was even created. 

Specifically, tcpip_init calls lwip_init, which calls netif_init, which calls
netif_add for the loopback interface, which asserts
LWIP_ASSERT_CORE_LOCKED().

See https://lists.nongnu.org/archive/html/lwip-users/2024-05/msg00002.html

Possible fix: move lines 668ff before lwip_init, see
https://github.com/lwip-tcpip/lwip/blob/86c9f7999150199374d7697fd2eed62dcd9b1afa/src/api/tcpip.c#L668-L672

I'm happy to submit a PR if needed (on Github?)

 







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