netdev - Re: [Linux Kernle Bug] INFO: rcu detected stall in e1000

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Message-ID: <CACT4Y+YLTF0bG6yJABOXg7zZt+1nV6ajHLJxSWzazSk2sH=tfA@mail.gmail.com>
Date: Thu, 28 Aug 2025 13:05:07 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Jiaming Zhang <r772577952@...il.com>
Cc: "anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>, davem@...emloft.net, 
	intel-wired-lan@...ts.osuosl.org, jesse.brandeburg@...el.com, kuba@...nel.org, 
	netdev@...r.kernel.org, security@...nel.org, linux-kernel@...r.kernel.org, 
	syzkaller@...glegroups.com
Subject: Re: [Linux Kernle Bug] INFO: rcu detected stall in e1000_watchdog

On Thu, 28 Aug 2025 at 12:40, Jiaming Zhang <r772577952@...il.com> wrote:
>
> Dear Linux kernel developers and maintainers:
>
> We are writing to report a kernel bug discovered with our modified
> version of syzkaller.
>
> The bug was initially found in Linux kernel v5.15.189 (commit
> c79648372d02944bf4a54d87e3901db05d0ac82e). We have attached the
> .config file and symbolized crash report for your reference.
>
> Unfortunately, we do not have a reliable reproducer at this time. We
> are actively analyzing the root cause and working to create a
> consistent reproducer, which we will share as soon as it is available.
>
> Please let us know if you need any further information.
>
> Best regards,
> Jiaming Zhang

Hi Jiaming,

This is likely to be a false positive. We found the default kernel
timeouts are not really suitable for fuzzing. Consider using the
official syzkaller-recommended configs with proper tuning for fuzzing.

Additionally, v5.15 is extremely old. Check out:
https://github.com/google/syzkaller/blob/master/docs/linux/reporting_kernel_bugs.md