Re: [lwip-users] lwip 2.0.3 "p->ref > 0" assert

[Markus Pischinger]

Thanks for the help.
I'm using NO_SYS=1 and all my calls are from main-loop context or callbacks.
From what context am I allowed to free a pbuf? My application only calls pbuf_free at the end of the receive callback.

Could you suggest such an application using NO_SYS that is known-to-work?

Kind regards,
Markus

Am 27/10/2017 um 15:13 schrieb Sergio R. Caprile:

That assertion is telling you that "someone" is trying to free a pbuf that has already been freed. Either by "himself" or "someone else".

That can be:
- a misbehaving application. You should check with a well-written and known-to-work application
- a buggy port, check your vendor forums
- a user not honoring the threading rules. Which API are you using ? NO_SYS= ? Do you have all your calls to low-level functions on the same context ? (either all foreground or all interrupts, no mixes)
- perhaps a buggy driver could also trash memory, but most of the times it is a threading problem or a crappy application


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