linux-kernel - Re: [syzbot] kernel BUG in hfs_write

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Message-ID: <aN6laD5P8zq0F5ns@Bertha>
Date: Thu, 2 Oct 2025 17:16:40 +0100
From: George Anthony Vernon <contact@...rnon.com>
To: syzbot <syzbot+97e301b4b82ae803d21b@...kaller.appspotmail.com>
Cc: damien.lemoal@...nsource.wdc.com, jlayton@...nel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: [syzbot] kernel BUG in hfs_write_inode

On Fri, Nov 25, 2022 at 01:45:41AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    65762d97e6fa Merge branch 'for-next/perf' into for-kernelci
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=14e324e3880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=56d0c7c3a2304e8f
> dashboard link: https://syzkaller.appspot.com/bug?extid=97e301b4b82ae803d21b
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10983553880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13315ebb880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/52f702197b30/disk-65762d97.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/72189c2789ce/vmlinux-65762d97.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ec0349196c98/Image-65762d97.gz.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/6bfea2266b7f/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+97e301b4b82ae803d21b@...kaller.appspotmail.com
> 

I simplified the reproducer previously while working on a patch for this bug and found it no longer reproduces on mainline. I just want to sanity check this by testing mainline with syzbot's repro:

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.17

Thanks,

George