IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready skbuff: skb_over_panic: text:ffffffff8577f2ff len:40 put:40 head:ffff88808d34b800 data:ffff88808d34b8b0 tail:0xd8 end:0xc0 dev:ip6gretap0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:104! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 7310 Comm: syz-executor505 Not tainted 4.14.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888092a40140 task.stack: ffff8880887c8000 RIP: 0010:skb_panic+0x172/0x174 net/core/skbuff.c:104 RSP: 0018:ffff8880aeb07a10 EFLAGS: 00010286 RAX: 0000000000000089 RBX: ffff88809ea88540 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff86ac07e0 RDI: ffffed1015d60f38 RBP: ffffffff873830a0 R08: 0000000000000089 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8577f2ff R13: 0000000000000028 R14: ffff88809e4b4d00 R15: 00000000000000c0 FS: 0000000001910880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000000881e3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic net/core/skbuff.c:109 [inline] skb_put.cold+0x24/0x24 net/core/skbuff.c:1699 ip6_mc_hdr.isra.0.constprop.0+0x11f/0x580 net/ipv6/mcast.c:1552 mld_newpack+0x3ab/0x7a0 net/ipv6/mcast.c:1603 add_grhead.isra.0+0x299/0x370 net/ipv6/mcast.c:1691 add_grec+0x69c/0xef0 net/ipv6/mcast.c:1822 mld_send_cr net/ipv6/mcast.c:1948 [inline] mld_ifc_timer_expire+0x33b/0x7b0 net/ipv6/mcast.c:2455 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:kmem_cache_free+0xa9/0x2b0 mm/slab.c:3759 RSP: 0018:ffff8880887cf020 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: ffff88809ea88900 RCX: 1ffff1101254813c RDX: 0000000000000000 RSI: ffff888092a409c0 RDI: 0000000000000282 RBP: ffff8880a9984a80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282 R13: ffffffff84f92548 R14: 0000000000000000 R15: 00000000014000c0 kfree_skbmem+0x98/0x100 net/core/skbuff.c:586 __kfree_skb net/core/skbuff.c:646 [inline] consume_skb+0xaf/0x330 net/core/skbuff.c:705 netlink_broadcast_filtered+0x2b3/0x9d0 net/netlink/af_netlink.c:1489 netlink_broadcast net/netlink/af_netlink.c:1511 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0x126/0x170 net/netlink/af_netlink.c:2476 rtnl_notify net/core/rtnetlink.c:653 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:2930 [inline] rtmsg_ifinfo_event.part.0+0x9a/0xc0 net/core/rtnetlink.c:2944 rtmsg_ifinfo_event net/core/rtnetlink.c:2951 [inline] rtmsg_ifinfo+0x64/0x80 net/core/rtnetlink.c:2950 netdev_state_change net/core/dev.c:1320 [inline] netdev_state_change+0xc3/0xd0 net/core/dev.c:1312 do_setlink+0x23eb/0x2c00 net/core/rtnetlink.c:2280 rtnl_group_changelink net/core/rtnetlink.c:2512 [inline] rtnl_newlink+0xbe4/0x1720 net/core/rtnetlink.c:2666 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x443d99 RSP: 002b:00007fff2a053b58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443d99 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 00007fff2a053b80 R08: 000000000000bf8c R09: 000000000000bf8c R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2a053bb0 R13: 00007fff2a053b70 R14: 0000000000000000 R15: 0000000000000000 Code: 8b 4c 24 10 8b 8b 80 00 00 00 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 e0 28 38 87 ff 74 24 10 ff 74 24 20 e8 26 9e 4d fc <0f> 0b e8 34 e0 5e fc 4c 8b 64 24 18 e8 6a 1d 88 fc 48 c7 c1 60 RIP: skb_panic+0x172/0x174 net/core/skbuff.c:104 RSP: ffff8880aeb07a10 ---[ end trace 92e51089cd0e72bc ]---