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Date:   Mon, 31 Jul 2023 13:55:56 +0800
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Subject: Re: [syzbot] WARNING in lookup_inline_extent_backref
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To:     syzbot <syzbot+d6f9ff86c1d804ba2bc6@syzkaller.appspotmail.com>,
        clm@fb.com, dsterba@suse.com, josef@toxicpanda.com,
        linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
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On 2022/12/5 16:13, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    a4412fdd49dc error-injection: Add prompt for function er=
ro..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D1469bdbd8800=
00
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3D2325e409a9a8=
93e1
> dashboard link: https://syzkaller.appspot.com/bug?extid=3Dd6f9ff86c1d804=
ba2bc6
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2d=
a-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D12d8924788=
0000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D16b1ca838800=
00
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/3bbe66b25958/di=
sk-a4412fdd.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6851483ca667/vmlin=
ux-a4412fdd.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2d5b23cb4616/=
bzImage-a4412fdd.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/1f178223d=
d56/mount_0.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the com=
mit:
> Reported-by: syzbot+d6f9ff86c1d804ba2bc6@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 6559 at fs/btrfs/extent-tree.c:865 lookup_inline_ex=
tent_backref+0x8c1/0x13f0
> Modules linked in:
> CPU: 0 PID: 6559 Comm: syz-executor311 Not tainted 6.1.0-rc7-syzkaller-0=
0123-ga4412fdd49dc #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS =
Google 10/26/2022
> RIP: 0010:lookup_inline_extent_backref+0x8c1/0x13f0 fs/btrfs/extent-tree=
.c:865
> Code: 98 00 00 00 0f 87 42 0b 00 00 e8 5a 9c 07 fe 4c 8b 6c 24 28 eb 3d =
83 7d 28 00 4c 8b 6c 24 28 0f 84 b0 04 00 00 e8 3f 9c 07 fe <0f> 0b 41 bc =
fb ff ff ff e9 f3 05 00 00 e8 2d 9c 07 fe e9 ca 05 00
> RSP: 0018:ffffc90006296e40 EFLAGS: 00010293
> RAX: ffffffff8382fbb1 RBX: 0000000000000000 RCX: ffff88801eab1d40
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffc90006296ff0 R08: ffffffff8382f700 R09: ffffed100faf1008
> R10: ffffed100faf1008 R11: 1ffff1100faf1007 R12: dffffc0000000000
> R13: ffff888075edcd10 R14: ffffc90006296f60 R15: ffff88807d788000
> FS:  00007fdb617d5700(0000) GS:ffff8880b9900000(0000) knlGS:000000000000=
0000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055912e028900 CR3: 000000001954b000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   insert_inline_extent_backref+0xcc/0x260 fs/btrfs/extent-tree.c:1152
>   __btrfs_inc_extent_ref+0x108/0x5e0 fs/btrfs/extent-tree.c:1455
>   btrfs_run_delayed_refs_for_head+0xf00/0x1df0 fs/btrfs/extent-tree.c:19=
43
>   __btrfs_run_delayed_refs+0x25f/0x490 fs/btrfs/extent-tree.c:2008
>   btrfs_run_delayed_refs+0x312/0x490 fs/btrfs/extent-tree.c:2139
>   qgroup_account_snapshot+0xce/0x340 fs/btrfs/transaction.c:1538
>   create_pending_snapshot+0xf35/0x2560 fs/btrfs/transaction.c:1800
>   create_pending_snapshots+0x1a8/0x1e0 fs/btrfs/transaction.c:1868
>   btrfs_commit_transaction+0x13f0/0x3760 fs/btrfs/transaction.c:2323
>   create_snapshot+0x4aa/0x7e0 fs/btrfs/ioctl.c:833
>   btrfs_mksubvol+0x62e/0x760 fs/btrfs/ioctl.c:983
>   btrfs_mksnapshot+0xb5/0xf0 fs/btrfs/ioctl.c:1029
>   __btrfs_ioctl_snap_create+0x339/0x450 fs/btrfs/ioctl.c:2184
>   btrfs_ioctl_snap_create+0x134/0x190 fs/btrfs/ioctl.c:2211
>   btrfs_ioctl+0x15c/0xc10
>   vfs_ioctl fs/ioctl.c:51 [inline]
>   __do_sys_ioctl fs/ioctl.c:870 [inline]
>   __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7fdb6184aa69
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 48 89 f8 48 89 =
f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 =
ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fdb617d52f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007fdb618d57f0 RCX: 00007fdb6184aa69
> RDX: 00000000200000c0 RSI: 0000000050009401 RDI: 0000000000000004
> RBP: 00007fdb618a226c R08: 00007fdb617d5700 R09: 0000000000000000
> R10: 00007fdb617d5700 R11: 0000000000000246 R12: 8000000000000000
> R13: 00007fdb618a1270 R14: 0000000100000000 R15: 00007fdb618d57f8
>   </TASK>

# syz test: git://github.com/adam900710/linux.git inline_lookup_debug
>
>
> ---
> 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@googlegroups.com.
>
> 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