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

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Message-ID: <eb979954-b43c-4e3d-8830-10ac0952e606@free.fr>
Date: Thu, 28 Aug 2025 18:39:28 +0200
From: F6BVP <f6bvp@...e.fr>
To: Florian Westphal <fw@...len.de>
Cc: Eric Dumazet <edumazet@...gle.com>,
 Dan Carpenter <dan.carpenter@...aro.org>, linux-hams@...r.kernel.org,
 netdev <netdev@...r.kernel.org>, Dan Cross <crossd@...il.com>,
 David Ranch <dranch@...nnet.net>,
 Folkert van Heusden <folkert@...heusden.com>
Subject: Re: [ROSE] [AX25] 6.15.10 long term stable kernel oops

Florian, thanks a lot for suggestions I followed when I understood more 
clearly what to do....

Here is linux-6.15.1 kernel panic captured by netconsole remotely and 
decoded by stacktrace script.

I guess next step is bisecting between 6.14.11 (good) and 6.15.1 (bad).

Regards,

Bernard

Le 27/08/2025 à 19:30, Florian Westphal a écrit :
> F6BVP <f6bvp@...e.fr> wrote:
>> Here I am. Next step is probably to discover why the call to
>> receive_buf() fails when bytes are not small and tty_ldisc_deref() is
>> acting after flush_to_ldisc probably leading to an error. What value is
>> wrong ? ld->tty , p, f ?
> 
> Did you enable CONFIG_KASAN?
> 
> Also, since you seem to be able to reproduce this easily, did you
> try a 'git bisect' to identify the breaking change?
> 
> That would allow to CC the author of that change.
> 
>> 4,19346,153786988,-;Hardware name: To be filled by O.E.M. To be filled by O.E.M./CK3, BIOS 5.011 09/16/2020
>> 4,19347,153786990,-;Workqueue: events_unbound flush_to_ldisc
>> 4,19348,153786998,-;Here I am: tty_ldisc_deref:283 !tty
>> 4,19349,153787003,-;Here I am: tty_ldisc_deref:283 !tty
>> 4,19350,153787005,-;RIP: 0010:__netif_receive_skb_core.constprop.0+0xfe5/0x12d0
>> 4,19398,153787265,-; __netif_receive_skb_one_core+0x3d/0xa0
> 
> as Eric noted, you need to pipe this through
> 
> scripts/decode_stacktrace.sh so this gets translated to line numbers.

View attachment "linux-6.15.1_stacktrace.txt" of type "text/plain" (12602 bytes)