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

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Message-ID: <aK9AuSkhr37VnRQS@strlen.de>
Date: Wed, 27 Aug 2025 19:30:33 +0200
From: Florian Westphal <fw@...len.de>
To: F6BVP <f6bvp@...e.fr>
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

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.