Re: [syzbot] WARNING in ovs_dp_cmd_new (2)

[Paolo Abeni]

On Wed, 2022-10-12 at 10:33 -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    e8bc52cb8df8 Merge tag 'driver-core-6.1-rc1' of git://git...
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1112f08a880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1b85abe77fd80fd6
> dashboard link: https://syzkaller.appspot.com/bug?extid=6c1a3b18294de0f138d8
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1112607c880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=144b0ca4880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/40287b1866de/disk-e8bc52cb.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1ef7d0e94dfc/vmlinux-e8bc52cb.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6c1a3b18294de0f138d8@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> ------------[ cut here ]------------
> Dropping previously announced user features
> WARNING: CPU: 1 PID: 3616 at net/openvswitch/datapath.c:1619 ovs_dp_reset_user_features net/openvswitch/datapath.c:1619 [inline]
> WARNING: CPU: 1 PID: 3616 at net/openvswitch/datapath.c:1619 ovs_dp_cmd_new+0xdf5/0x1300 net/openvswitch/datapath.c:1822
> Modules linked in:
> CPU: 1 PID: 3616 Comm: syz-executor259 Not tainted 6.0.0-syzkaller-07994-ge8bc52cb8df8 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
> RIP: 0010:ovs_dp_reset_user_features net/openvswitch/datapath.c:1619 [inline]
> RIP: 0010:ovs_dp_cmd_new+0xdf5/0x1300 net/openvswitch/datapath.c:1822
> Code: 2a 0f b6 04 02 84 c0 74 04 3c 03 7e 21 c7 43 68 00 00 00 00 e9 30 fe ff ff e8 b7 fe 53 f8 48 c7 c7 00 13 21 8b e8 c7 a5 16 00 <0f> 0b eb be 4c 89 e7 e8 9f 14 a1 f8 eb d5 e8 38 14 a1 f8 e9 3f ff
> RSP: 0018:ffffc90003f0f4e8 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: ffff8880126fa000 RCX: 0000000000000000
> RDX: ffff88801e751d80 RSI: ffffffff8160f738 RDI: fffff520007e1e8f
> RBP: ffff888016a0ae00 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000080000000 R11: 676e6970706f7244 R12: ffff8880126fa068
> R13: 0000000000000008 R14: ffff888016a0ae58 R15: ffff8880266cd880
> FS:  000055555626b300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000916 CR3: 00000000265ee000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
>  genl_family_rcv_msg net/netlink/genetlink.c:808 [inline]
>  genl_rcv_msg+0x441/0x780 net/netlink/genetlink.c:825
>  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540
>  genl_rcv+0x24/0x40 net/netlink/genetlink.c:836
>  netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
>  netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
>  netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
>  sock_sendmsg_nosec net/socket.c:714 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:734
>  ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
>  ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
>  __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f9aa25fce89
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fff35f65558 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00000000000095e8 RCX: 00007f9aa25fce89
> RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
> RBP: 0000000000000000 R08: 00007fff35f656f8 R09: 00007fff35f656f8
> R10: 00007fff35f64fd0 R11: 0000000000000246 R12: 00007fff35f6556c
> R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
>  </TASK>
> 
> 
> ---
> 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 dup: WARNING in ovs_dp_reset_user_features