netdev - Re: [ROSE] [AX25] 6.15.10 long term stable kernel oops

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Message-ID: <90efee88-b9dc-4f87-86f2-6ab60701c39f@free.fr>
Date: Thu, 21 Aug 2025 13:28:08 +0200
From: F6BVP <f6bvp@...e.fr>
To: linux-hams@...r.kernel.org, netdev <netdev@...r.kernel.org>
Cc: Dan Cross <crossd@...il.com>, Folkert van Heusden
 <folkert@...heusden.com>, David Ranch <dranch@...nnet.net>
Subject: Re: [ROSE] [AX25] 6.15.10 long term stable kernel oops

Hi,

I confirm that linux-6.14 branch up to linux-6.14.11 is fine while ALL 
following kernels Oops with kernel panics when using mkiss driver for AX25.

I did not find how to see changes from 6.14.11 to 6.15.1 that Oops !

Having read that 6.15.1 should not be used and be replaced by 6.15.2, I 
maked and installed it and found something more interesting during 
kernel panics.

Actually a new event is triggered by mkiss. As shown in attached picture 
new kind of message says :

Workqueue: event_unbound flush_to_ldisc
RIP: 0010:__netif_receive_skb_core.constprop.0+0x1051/0x1330

I grepped kernel net files and found netif_receive_skb_core in /core/dev.c

Could it be that the bug is inside this function when receiving some 
kind of unexpected buffer from mkiss ?

Not being a software engineer (I was actually MD before retiring at 75 
from université Pitie-Salpetriere associate professor and hospital...), 
I need some help to perform further investigations.

Bernard,
hamradio f6bvp /ai7bg

Download attachment "netif_receive_6.15.2-1.jpg" of type "image/jpeg" (173845 bytes)