linux-kernel - Re: [PATCH 5.10 0/2] mm/truncate: fix issue in ext4_set_page

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Message-ID: <ZaAJwEg4rvleFuC9@casper.infradead.org>
Date: Thu, 11 Jan 2024 15:31:12 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Roman Smirnov <r.smirnov@....ru>
Cc: stable@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Sergey Shtylyov <s.shtylyov@....ru>,
	Karina Yankevich <k.yankevich@....ru>, lvc-project@...uxtesting.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 5.10 0/2] mm/truncate: fix issue in ext4_set_page_dirty()

On Thu, Jan 11, 2024 at 02:37:45PM +0000, Roman Smirnov wrote:
> Syzkaller reports warning in ext4_set_page_dirty() in 5.10 stable 
> releases. The problem can be fixed by the following patches 
> which can be cleanly applied to the 5.10 branch.

I do not understand the crash, and I do not understand why this patch
would fix it.  Can you explain either?

> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
> 
> Link: https://syzkaller.appspot.com/bug?extid=02f21431b65c214aa1d6
> 
> Matthew Wilcox (Oracle) (2):
>   mm/truncate: Inline invalidate_complete_page() into its one caller
>   mm/truncate: Replace page_mapped() call in invalidate_inode_page()
> 
>  kernel/futex/core.c |  2 +-
>  mm/truncate.c       | 34 +++++++---------------------------
>  2 files changed, 8 insertions(+), 28 deletions(-)
> 
> -- 
> 2.34.1
>