netdev - Re: new splat

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Message-ID: <48e12ec7-61ae-4e48-a3f8-71e776bd5bb9@uliege.be>
Date: Tue, 1 Apr 2025 20:16:34 +0200
From: Justin Iurman <justin.iurman@...ege.be>
To: Stanislav Fomichev <stfomichev@...il.com>
Cc: Paolo Abeni <pabeni@...hat.com>,
 Alexei Starovoitov <alexei.starovoitov@...il.com>, bpf
 <bpf@...r.kernel.org>, Network Development <netdev@...r.kernel.org>,
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: new splat

On 4/1/25 18:45, Stanislav Fomichev wrote:
> On 04/01, Justin Iurman wrote:
>>
>> Correct, I came to the same conclusion based on that trace. However, I can't
>> reproduce it with a PREEMPT kernel. It goes through without problem and the
>> output is (as expected), i.e., "lwtunnel_xmit(): recursion limit reached on
>> datapath".
> 
> For me adding the following to the config did the trick:
> CONFIG_PREEMPT
> CONFIG_DEBUG_PREEMPT
> 
> And reverting your patch made it go away.

*Sigh* Looks like CONFIG_DEBUG_PREEMPT did the trick... thanks!

@Paolo, I'll provide a fix ASAP.