skbuff: skb_under_panic: text:ffffffff8a3a8960 len:88 put:40 head:ffff88806dc996c0 data:ffff88806dc996a8 tail:0x40 end:0x180 dev:team0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:213! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 100 Comm: kworker/u32:5 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:213 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 20 cd c2 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 4a 24 60 f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 44 59 eb f8 4c RSP: 0018:ffffc9000152e978 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88804ffa3900 RCX: ffffffff819c1865 RDX: 0000000000000000 RSI: ffffffff819c9449 RDI: 0000000000000005 RBP: ffffffff8cc2e020 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000400 R11: ffff8880217f54b0 R12: ffffffff8a3a8960 R13: 0000000000000028 R14: ffff8880216c4120 R15: 0000000000000180 FS: 0000000000000000(0000) GS:ffff8880976fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f72faf6c CR3: 000000000e184000 CR4: 0000000000352ef0 Call Trace: skb_under_panic net/core/skbuff.c:223 [inline] skb_push+0xca/0xf0 net/core/skbuff.c:2641 ip6gre_header+0xc0/0x8d0 net/ipv6/ip6_gre.c:1371 dev_hard_header include/linux/netdevice.h:3436 [inline] arp_create+0x495/0xa10 net/ipv4/arp.c:578 arp_send_dst net/ipv4/arp.c:314 [inline] arp_send_dst+0xb1/0x270 net/ipv4/arp.c:301 arp_solicit+0x666/0x10d0 net/ipv4/arp.c:392 neigh_probe+0xce/0x110 net/core/neighbour.c:1097 __neigh_event_send+0xab0/0x1390 net/core/neighbour.c:1270 neigh_event_send_probe include/net/neighbour.h:480 [inline] neigh_event_send include/net/neighbour.h:486 [inline] neigh_event_send include/net/neighbour.h:484 [inline] neigh_resolve_output+0x56b/0x940 net/core/neighbour.c:1578 neigh_output include/net/neighbour.h:556 [inline] ip_finish_output2+0x7f8/0x21a0 net/ipv4/ip_output.c:237 __ip_finish_output.part.0+0x1b4/0x350 net/ipv4/ip_output.c:315 __ip_finish_output net/ipv4/ip_output.c:303 [inline] ip_finish_output net/ipv4/ip_output.c:325 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x35f/0xa90 net/ipv4/ip_output.c:438 dst_output include/net/dst.h:464 [inline] ip_local_out+0x38d/0x4d0 net/ipv4/ip_output.c:131 iptunnel_xmit+0x67a/0xad0 net/ipv4/ip_tunnel_core.c:84 ip_tunnel_xmit+0x1fd2/0x3850 net/ipv4/ip_tunnel.c:845 __gre_xmit+0x8bb/0xc00 net/ipv4/ip_gre.c:488 ipgre_xmit+0x523/0xb10 net/ipv4/ip_gre.c:692 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x97/0x6e0 net/core/dev.c:3869 __dev_queue_xmit+0x6d7/0x4650 net/core/dev.c:4817 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xad1/0x1cf0 net/ipv6/ip6_output.c:136 __ip6_finish_output+0x3cd/0x1010 net/ipv6/ip6_output.c:209 ip6_finish_output net/ipv6/ip6_output.c:220 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x253/0x710 net/ipv6/ip6_output.c:247 dst_output+0xa8/0x4b0 include/net/dst.h:464 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] mld_sendpack+0xa30/0xed0 net/ipv6/mcast.c:1855 mld_send_initial_cr+0x214/0x320 net/ipv6/mcast.c:2271 ipv6_mc_dad_complete+0xa7/0x1d0 net/ipv6/mcast.c:2279 addrconf_dad_completed+0xd8a/0x10d0 net/ipv6/addrconf.c:4340 addrconf_dad_begin net/ipv6/addrconf.c:4122 [inline] addrconf_dad_work+0xd04/0x14f0 net/ipv6/addrconf.c:4227 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:213 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 20 cd c2 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 4a 24 60 f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 44 59 eb f8 4c RSP: 0018:ffffc9000152e978 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88804ffa3900 RCX: ffffffff819c1865 RDX: 0000000000000000 RSI: ffffffff819c9449 RDI: 0000000000000005 RBP: ffffffff8cc2e020 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000400 R11: ffff8880217f54b0 R12: ffffffff8a3a8960 R13: 0000000000000028 R14: ffff8880216c4120 R15: 0000000000000180 FS: 0000000000000000(0000) GS:ffff8880976fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f72faf6c CR3: 000000000e184000 CR4: 0000000000352ef0