Re: [syzbot] [btrfs?] VFS: Busy inodes after unmount (use-after-free)

[Julian Sun]

On Wed, 2023-01-25 at 02:43 -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    edb2f0dc90f2 Merge branch 'for-next/core' 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=1484d22e480000
> kernel config: 
> https://syzkaller.appspot.com/x/.config?x=a1c301efa2b11613
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=0af00f6a2cba2058b5db
> 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=15e20341480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154fa4f1480000
> 
> Downloadable assets:
> disk image:
> https://storage.googleapis.com/syzbot-assets/ca1677dc6969/disk-edb2f0dc.raw.xz
> vmlinux:
> https://storage.googleapis.com/syzbot-assets/22527595a2dd/vmlinux-edb2f0dc.xz
> kernel image:
> https://storage.googleapis.com/syzbot-assets/45308e5f6962/Image-edb2f0dc.gz.xz
> mounted in repro:
> https://storage.googleapis.com/syzbot-assets/6105a892b6d5/mount_0.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the
> commit:
> Reported-by: syzbot+0af00f6a2cba2058b5db@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds. 
> Have a nice day...
> VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds. 
> Have a nice day...
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches

#syz test

-- 
Julian Sun <sunjunchao2870@xxxxxxxxx>