linux-kernel - Re: [BUG] WARNING in sendmsg

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Message-ID: <CANn89iKjjZ2rBBFjMZsPgGWi7-EwVUpJ=jMdkn2s-=BJEjvvuw@mail.gmail.com>
Date: Mon, 9 Jun 2025 06:48:15 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: Xianying Wang <wangxianying546@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] WARNING in sendmsg

On Mon, Jun 9, 2025 at 6:40 AM Xianying Wang <wangxianying546@...il.com> wrote:
>
> Hi,
>
> I discovered a kernel WARNING described as "WARNING in sendmsg"when
> fuzzing the Linux 6.8 kernel using Syzkaller. This issue occurs in the
> memory allocation path within the sendmsg system call, specifically in
> the __alloc_pages function at mm/page_alloc.c:4545. The warning is
> triggered by a WARN_ON_ONCE assertion in the page allocator during an
> attempt to allocate memory via kmalloc from the socket layer.

linux-6.8 is not supported.

Please do not send us syzkaller reports on old versions, always use
the latest trees.