On 10/13/21 1:40 PM, syzbot wrote:
Hello, syzbot found the following issue on:
[ +Paolo/Toke wrt veth/XDP, +Jussi wrt bond/XDP, please take a look, thanks! ]
HEAD commit: 683f29b781ae Add linux-next specific files for 20211008 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1525a614b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=673b3589d970c dashboard link: https://syzkaller.appspot.com/bug?extid=62e474dd92a35e3060d8 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=17c98e98b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+62e474dd92a35e3060d8@xxxxxxxxxxxxxxxxxxxxxxxxx IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready list_add double add: new=ffff888023417160, prev=ffff88807de3a050, next=ffff888023417160. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 9490 Comm: syz-executor.1 Not tainted 5.15.0-rc4-next-20211008-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: b1 24 c3 fa 4c 89 e1 48 c7 c7 60 56 04 8a e8 f2 8c f1 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 a0 57 04 8a e8 db 8c f1 ff <0f> 0b 48 89 f1 48 c7 c7 20 57 04 8a 4c 89 e6 e8 c7 8c f1 ff 0f 0b RSP: 0018:ffffc90002c26a48 EFLAGS: 00010286 RAX: 0000000000000058 RBX: 0000000000000040 RCX: 0000000000000000 RDX: ffff888023263a00 RSI: ffffffff815e0d78 RDI: fffff52000584d3b RBP: ffff888023417160 R08: 0000000000000058 R09: 0000000000000000 R10: ffffffff815dab5e R11: 0000000000000000 R12: ffff888023417160 R13: ffff888023417000 R14: ffff888023417160 R15: ffff888023417160 FS: 00007f841e9e8700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000601bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __list_add_rcu include/linux/rculist.h:79 [inline] list_add_rcu include/linux/rculist.h:106 [inline] netif_napi_add+0x3fd/0x9c0 net/core/dev.c:6889 veth_enable_xdp_range+0x1b1/0x300 drivers/net/veth.c:1009 veth_enable_xdp+0x2a5/0x620 drivers/net/veth.c:1063 veth_xdp_set drivers/net/veth.c:1483 [inline] veth_xdp+0x4d4/0x780 drivers/net/veth.c:1523 bond_xdp_set drivers/net/bonding/bond_main.c:5217 [inline] bond_xdp+0x325/0x920 drivers/net/bonding/bond_main.c:5263 dev_xdp_install+0xd5/0x270 net/core/dev.c:9365 dev_xdp_attach+0x83d/0x1010 net/core/dev.c:9513 dev_change_xdp_fd+0x246/0x300 net/core/dev.c:9753 do_setlink+0x2fb4/0x3970 net/core/rtnetlink.c:2931 rtnl_group_changelink net/core/rtnetlink.c:3242 [inline] __rtnl_newlink+0xc06/0x1750 net/core/rtnetlink.c:3396 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 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+0x44/0xae RIP: 0033:0x7f841f2718d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f841e9e8188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f841f375f60 RCX: 00007f841f2718d9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 00007f841f2cbcb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8978d37f R14: 00007f841e9e8300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 7281cadbc8534f23 ]--- RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: b1 24 c3 fa 4c 89 e1 48 c7 c7 60 56 04 8a e8 f2 8c f1 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 a0 57 04 8a e8 db 8c f1 ff <0f> 0b 48 89 f1 48 c7 c7 20 57 04 8a 4c 89 e6 e8 c7 8c f1 ff 0f 0b RSP: 0018:ffffc90002c26a48 EFLAGS: 00010286 RAX: 0000000000000058 RBX: 0000000000000040 RCX: 0000000000000000 RDX: ffff888023263a00 RSI: ffffffff815e0d78 RDI: fffff52000584d3b RBP: ffff888023417160 R08: 0000000000000058 R09: 0000000000000000 R10: ffffffff815dab5e R11: 0000000000000000 R12: ffff888023417160 R13: ffff888023417000 R14: ffff888023417160 R15: ffff888023417160 FS: 00007f841e9e8700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000601bd000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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
