From: Matthew Wilcox <willy@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Xianying Wang <wangxianying546@gmail.com>,
viro@zeniv.linux.org.uk, brauner@kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [BUG] WARNING in bdev_getblk
Date: Mon, 9 Jun 2025 21:48:49 +0100 [thread overview]
Message-ID: <aEdIsaZIcR_co42X@casper.infradead.org> (raw)
In-Reply-To: <x3govm5j2nweio5k3r4imvg6cyg3onadln4tvj7bh4gmleuzqn@zmnbnjfqawfo>
On Mon, Jun 09, 2025 at 03:54:01PM +0200, Jan Kara wrote:
> Hi!
>
> On Mon 09-06-25 16:39:15, Xianying Wang wrote:
> > I encountered a kernel WARNING in the function bdev_getblk() when
> > fuzzing the Linux 6.12 kernel using Syzkaller. The crash occurs during
> > a block buffer allocation path, where __alloc_pages_noprof() fails
> > under memory pressure, and triggers a WARNING due to an internal
> > allocation failure.
>
> Ah, this is a warning about GFP_NOFAIL allocation from direct reclaim:
It's the same discussion we had at LSFMM. It seems like we have a lot
of "modified syzkaller" people trying this kind of thing.
next prev parent reply other threads:[~2025-06-09 20:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-09 8:39 [BUG] WARNING in bdev_getblk Xianying Wang
2025-06-09 13:54 ` Jan Kara
2025-06-09 20:48 ` Matthew Wilcox [this message]
2025-06-10 8:02 ` Jan Kara
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