linux-kernel - Re: [PATCH] fs: f2fs: remove WARN_ON in f2fs_is_valid

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Date:   Sat, 9 Apr 2022 08:27:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     Dongliang Mu <dzm91@...t.edu.cn>, Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Dongliang Mu <mudongliangabcd@...il.com>,
        syzbot+763ae12a2ede1d99d4dc@...kaller.appspotmail.com,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: f2fs: remove WARN_ON in f2fs_is_valid_blkaddr

On 2022/4/8 13:22, Dongliang Mu wrote:
> From: Dongliang Mu <mudongliangabcd@...il.com>
> 
> In f2fs_is_valid_blkaddr, if type is DATA_GENERIC_ENHANCE or
> DATA_GENERIC_ENHANCE_READ, it invokes WARN_ON(1) not matter
> blkaddr is in the range or not.

If we run into the path where we invoke WARN_ON(1) in f2fs_is_valid_blkaddr(),
It means f2fs image may be broken, or there is a bug in f2fs.

So, do you suffer any related issue in your environment?

Thanks,

> 
> Fix this by removing WARN_ON.
> 
> Note that, syzbot patch testing does not incur any further issues
> 
> Reported-by: syzbot+763ae12a2ede1d99d4dc@...kaller.appspotmail.com
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
>   fs/f2fs/checkpoint.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index f5366feea82d..521498b2dd8c 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -158,7 +158,6 @@ static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
>   		f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d",
>   			 blkaddr, exist);
>   		set_sbi_flag(sbi, SBI_NEED_FSCK);
> -		WARN_ON(1);
>   	}
>   	return exist;
>   }
> @@ -196,7 +195,6 @@ bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
>   			f2fs_warn(sbi, "access invalid blkaddr:%u",
>   				  blkaddr);
>   			set_sbi_flag(sbi, SBI_NEED_FSCK);
> -			WARN_ON(1);
>   			return false;
>   		} else {
>   			return __is_bitmap_valid(sbi, blkaddr, type);