linux-kernel - Re: [syzbot] [iomap?] WARNING in iomap

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Message-ID: <5f85c28d-5d06-4639-9453-41c38854173e@linux.alibaba.com>
Date: Tue, 15 Oct 2024 17:10:46 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: syzbot <syzbot+74cc7d98ae5484c2744d@...kaller.appspotmail.com>,
 brauner@...nel.org, chao@...nel.org, dhavale@...gle.com, djwong@...nel.org,
 huyue2@...lpad.com, jefflexu@...ux.alibaba.com,
 linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
 syzkaller-bugs@...glegroups.com, xiang@...nel.org
Subject: Re: [syzbot] [iomap?] WARNING in iomap_iter (3)

Hi,

On 2024/10/15 17:03, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d61a00525464 Add linux-next specific files for 20241011
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=175a3b27980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8554528c7f4bf3fb
> dashboard link: https://syzkaller.appspot.com/bug?extid=74cc7d98ae5484c2744d
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1513b840580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1313b840580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f615720e9964/disk-d61a0052.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/c4a45c7583c6/vmlinux-d61a0052.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d767ab86d0d0/bzImage-d61a0052.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/fce276498eea/mount_0.gz
> 
> The issue was bisected to:
> 
> commit 56bd565ea59192bbc7d5bbcea155e861a20393f4
> Author: Gao Xiang <hsiangkao@...ux.alibaba.com>
> Date:   Thu Oct 10 09:04:20 2024 +0000
> 
>      erofs: get rid of kaddr in `struct z_erofs_maprecorder`

I will look into that, but it seems it's just a trivial cleanup,
not quite sure what happens here...

Thanks,
Gao Xiang