skbuff: skb_under_panic: text:ffffffff86d0aa27 len:115 put:19 head:ffff88809cf0a000 data:ffff88809cf09ffd tail:0x70 end:0x6c0 dev:bond0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6847 Comm: syz-executor771 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:109 Code: fb 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 a0 b4 fe 88 ff 74 24 10 ff 74 24 20 e8 34 3a 25 fb <0f> 0b e8 ee dd 3b fb 4c 8b 64 24 18 e8 44 e9 7b fb 48 c7 c1 a0 c0 RSP: 0018:ffffc900000078c8 EFLAGS: 00010282 RAX: 0000000000000087 RBX: ffff88809e0ffe00 RCX: 0000000000000000 RDX: ffff88809c572500 RSI: ffffffff815dafc7 RDI: fffff52000000f0b RBP: ffffffff88fec0a0 R08: 0000000000000087 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000000080fe8 R12: ffffffff86d0aa27 R13: 0000000000000013 R14: ffff88809f530000 R15: 00000000000006c0 FS: 0000000000d5c880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80fc3c3000 CR3: 000000009a739000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_under_panic net/core/skbuff.c:119 [inline] skb_push.cold+0x24/0x24 net/core/skbuff.c:1884 ipgre_header+0x67/0x3c0 net/ipv4/ip_gre.c:840 dev_hard_header include/linux/netdevice.h:3049 [inline] neigh_connected_output+0x241/0x370 net/core/neighbour.c:1513 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x8b6/0x17b0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] mld_sendpack+0x92a/0xdb0 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x60a/0xf10 net/ipv6/mcast.c:2474 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 do_softirq kernel/softirq.c:343 [inline] do_softirq+0x17b/0x1e0 kernel/softirq.c:330 __local_bh_enable_ip+0x14d/0x190 kernel/softirq.c:195 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2226 [inline] nf_ct_iterate_cleanup+0x9e/0x330 net/netfilter/nf_conntrack_core.c:2249 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2334 [inline] nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2319 masq_device_event+0xae/0xe0 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] dev_close_many+0x30b/0x650 net/core/dev.c:1634 dev_close net/core/dev.c:1656 [inline] dev_close+0x173/0x220 net/core/dev.c:1650 bond_enslave+0x244a/0x48a0 drivers/net/bonding/bond_main.c:2018 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2517 __rtnl_newlink+0x132a/0x1740 net/core/rtnetlink.c:3469 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443829 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc45962788 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443829 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00007ffc45962790 R08: 0000000001bbbbbb R09: 0000000001bbbbbb R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007ffc459627a0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 18855b6e1c15bcbe ]--- RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:109 Code: fb 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 a0 b4 fe 88 ff 74 24 10 ff 74 24 20 e8 34 3a 25 fb <0f> 0b e8 ee dd 3b fb 4c 8b 64 24 18 e8 44 e9 7b fb 48 c7 c1 a0 c0 RSP: 0018:ffffc900000078c8 EFLAGS: 00010282 RAX: 0000000000000087 RBX: ffff88809e0ffe00 RCX: 0000000000000000 RDX: ffff88809c572500 RSI: ffffffff815dafc7 RDI: fffff52000000f0b RBP: ffffffff88fec0a0 R08: 0000000000000087 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000000080fe8 R12: ffffffff86d0aa27 R13: 0000000000000013 R14: ffff88809f530000 R15: 00000000000006c0 FS: 0000000000d5c880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80fc3c3000 CR3: 000000009a739000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400