netdev - Re: BUG: general protection fault in batadv_bla_del_backbone

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Message-ID: <2212852.CQOukoFCf9@sven-l14>
Date: Thu, 29 Aug 2024 08:27:20 +0200
From: Sven Eckelmann <sven@...fation.org>
To: Xingyu Li <xli399@....edu>
Cc: mareklindner@...mailbox.ch, sw@...onwunderlich.de, a@...table.cc,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 b.a.t.m.a.n@...ts.open-mesh.org, Yu Hao <yhao016@....edu>
Subject: Re: BUG: general protection fault in batadv_bla_del_backbone_claims

On Thursday, 29 August 2024 06:30:23 CEST Xingyu Li wrote:
> > Which line would that be in your build?
> 
> Somehow, the bug report does not include the line number in my end.

You can try to use gdb or similar tools to figure out more about it [1]. Maybe 
even adjust your kernel build to create better debuggable crashes

> 
> At the moment, I am unable to reproduce this crash with the provided
> reproducer.

Since I am missing information and you don't have a working reproducer - how 
should I then fix anything? Your comment from the first doesn't seem to apply 
and it is unclear how you came to the conclusion in the first place.

> > Can you reproduce it with it?
> 
> Sorry. The above syzkaller reproducer needs the additional support  to run it.
> But here is a C reproducer:
> https://gist.github.com/freexxxyyy/0be5002c45d7f060cb599dd7595cab78

I've tried to run it with the normal syz-execprog - but you seem to say now 
that this reproducer is not working the upstream one? In this case, please try 
to get it working with upstream. See also the mail from Kees Cook [2].

Kind regards,
	Sven

[1] https://www.open-mesh.org/projects/devtools/wiki/Crashlog_with_pstore#Decoding-the-stack-trace
[2] https://lore.kernel.org/r/202408281812.3F765DF@keescook
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