netlink: 132 bytes leftover after parsing attributes in process `syz-executor.4'. skbuff: skb_over_panic: text:0000000049c9ff5b len:56 put:8 head:000000002bf43b4d data:0000000082fdc689 tail:0xc8 end:0xc0 dev:ip6tnl0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:104! invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI Modules linked in: CPU: 0 PID: 4957 Comm: kworker/0:3 Not tainted 4.14.157-syzkaller #0 Workqueue: ipv6_addrconf addrconf_dad_work task: 0000000024d9a86a task.stack: 000000001e6db9e7 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: 0018:ffff8881c9267868 EFLAGS: 00010286 RAX: 0000000000000085 RBX: ffff88819767cdc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff9a66a420 RDI: ffffed103924ceff RBP: ffffffff9a88a0a0 R08: 0000000000000085 R09: ffffed103b744ce9 R10: ffffed103b744ce8 R11: ffff8881dba26747 R12: ffffffff99f8664e R13: 0000000000000008 R14: ffff8881d453e600 R15: 00000000000000c0 FS: 0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000271a978 CR3: 000000017aa26004 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: skb_over_panic net/core/skbuff.c:109 [inline] skb_put.cold+0x24/0x24 net/core/skbuff.c:1699 mld_newpack+0x4ce/0x7a0 net/ipv6/mcast.c:1608 add_grhead.isra.0+0x29c/0x370 net/ipv6/mcast.c:1691 add_grec+0x6a3/0xf10 net/ipv6/mcast.c:1822 mld_send_initial_cr.part.0+0xb1/0x140 net/ipv6/mcast.c:2072 mld_send_initial_cr net/ipv6/mcast.c:2090 [inline] ipv6_mc_dad_complete+0x163/0x1b0 net/ipv6/mcast.c:2084 addrconf_dad_completed+0x7eb/0xad0 net/ipv6/addrconf.c:4079 addrconf_dad_begin net/ipv6/addrconf.c:3867 [inline] addrconf_dad_work+0x99e/0x1170 net/ipv6/addrconf.c:3969 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Code: 20 ff 4c 8b 4c 24 10 8b 4b 78 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 c0 9a 88 9a ff 74 24 10 ff 74 24 20 e8 e9 9d ee fe <0f> 0b e8 67 78 fd fe 4c 8b 64 24 18 e8 fd 3e 20 ff 48 c7 c1 60 RIP: skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: ffff8881c9267868 ---[ end trace 97732a641cbb4e2a ]---