skbuff: skb_under_panic: text:00000000b0df390a len:84 put:44 head:000000008c9e6d60 data:000000004df92393 tail:0x40 end:0xc0 dev:ip6gre0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:104! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 15728 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:skb_panic+0x172/0x174 net/core/skbuff.c:104 Code: 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 60 4f 4c 89 ff 74 24 10 ff 74 24 20 e8 f1 18 e2 ff <0f> 0b e8 7f e7 50 f9 4c 8b 64 24 18 e8 c5 aa 86 f9 48 c7 c1 c0 58 RSP: 0018:ffff88803911eb98 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffff8880aef832c0 RCX: 0000000000000000 RDX: 000000000001f0a8 RSI: ffffffff814dff01 RDI: ffffed1007223d65 RBP: ffffffff894c58c0 R08: 0000000000000087 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffffffff871ee753 R13: 000000000000002c R14: ffff888090d4ad80 R15: 00000000000000c0 FS: 00007f21599e8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc05d55fc8 CR3: 00000000a56fa000 CR4: 00000000003426e0 DR0: 00000000ffff070c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_under_panic net/core/skbuff.c:114 [inline] skb_push.cold+0x24/0x24 net/core/skbuff.c:1730 ip6gre_header+0xb3/0x8e0 net/ipv6/ip6_gre.c:1373 dev_hard_header include/linux/netdevice.h:2886 [inline] neigh_connected_output+0x389/0x5e0 net/core/neighbour.c:1398 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] ip6_local_out+0xaf/0x170 net/ipv6/output_core.c:160 ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:484 [inline] ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:529 [inline] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:593 [inline] ipvlan_queue_xmit+0x1479/0x18e0 drivers/net/ipvlan/ipvlan_core.c:654 ipvlan_start_xmit+0x4f/0x190 drivers/net/ipvlan/ipvlan_main.c:290 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 overlayfs: filesystem on './bus' not supported as upperdir neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip6_finish_output2+0xde7/0x2290 net/ipv6/ip6_output.c:120 overlayfs: filesystem on './bus' not supported as upperdir ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192 overlayfs: filesystem on './bus' not supported as upperdir NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] ip6_local_out+0xaf/0x170 net/ipv6/output_core.c:160 ip6_send_skb+0xb3/0x300 net/ipv6/ip6_output.c:1741 ip6_push_pending_frames+0xbd/0xe0 net/ipv6/ip6_output.c:1761 rawv6_push_pending_frames net/ipv6/raw.c:618 [inline] rawv6_sendmsg+0x2a81/0x36a0 net/ipv6/raw.c:959 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2227 __sys_sendmmsg+0x195/0x470 net/socket.c:2322 __do_sys_sendmmsg net/socket.c:2351 [inline] __se_sys_sendmmsg net/socket.c:2348 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2348 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f215b073279 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f21599e8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f215b185f80 RCX: 00007f215b073279 RDX: 03fffffffffffe9f RSI: 00000000200092c0 RDI: 0000000000000005 RBP: 00007f215b0cd189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffdb74a40f R14: 00007f21599e8300 R15: 0000000000022000 Modules linked in: ---[ end trace 5ea4a5720877ce22 ]--- RIP: 0010:skb_panic+0x172/0x174 net/core/skbuff.c:104 Code: 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 60 4f 4c 89 ff 74 24 10 ff 74 24 20 e8 f1 18 e2 ff <0f> 0b e8 7f e7 50 f9 4c 8b 64 24 18 e8 c5 aa 86 f9 48 c7 c1 c0 58 RSP: 0018:ffff88803911eb98 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffff8880aef832c0 RCX: 0000000000000000 RDX: 000000000001f0a8 RSI: ffffffff814dff01 RDI: ffffed1007223d65 RBP: ffffffff894c58c0 R08: 0000000000000087 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffffffff871ee753 R13: 000000000000002c R14: ffff888090d4ad80 R15: 00000000000000c0 FS: 00007f21599e8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc05d55fc8 CR3: 00000000a56fa000 CR4: 00000000003426e0 DR0: 00000000ffff070c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400