skbuff: skb_under_panic: text:000000004e9db1e9 len:119 put:44 head:00000000f7ee2df0 data:0000000072fcef39 tail:0x40 end:0xc0 dev:ip6gre0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:109! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 13454 Comm: syz-executor.2 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x176/0x178 net/core/skbuff.c:109 Code: 80 7f fb 4c 8b 4d b8 8b 4b 70 41 57 45 89 f0 4c 89 ea ff 75 d0 4c 89 e6 48 c7 c7 60 ac f8 88 ff 75 c8 ff 75 c0 e8 72 ec 29 fb <0f> 0b e8 57 d8 40 fb 4c 8b 6d 08 e8 de 76 7f fb 48 c7 c1 00 b9 f8 RSP: 0018:ffffc90005387250 EFLAGS: 00010286 RAX: 0000000000000088 RBX: ffff8880971a9540 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815eae46 RDI: fffff52000a70e3c RBP: ffffc900053872b8 R08: 0000000000000088 R09: ffffed1015d26659 R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: ffffffff88f8b900 R13: ffffffff86fae679 R14: 000000000000002c R15: ffff888061ff0000 FS: 00007f420073b700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d322000 CR3: 000000009da76000 CR4: 00000000001406e0 DR0: 0000000020000c00 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: skb_under_panic net/core/skbuff.c:119 [inline] skb_push.cold+0x23/0x23 net/core/skbuff.c:1884 ip6gre_header+0xc9/0xa60 net/ipv6/ip6_gre.c:1343 dev_hard_header include/linux/netdevice.h:2987 [inline] neigh_connected_output+0x390/0x5f0 net/core/neighbour.c:1511 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x109a/0x25c0 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] rawv6_send_hdrinc net/ipv6/raw.c:687 [inline] rawv6_sendmsg+0x20f6/0x3900 net/ipv6/raw.c:944 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x753/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c449 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f420073ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f420073b6d4 RCX: 000000000045c449 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f2 R14: 00000000004cc687 R15: 000000000076bfcc Modules linked in: ---[ end trace 6700ece32b9304bf ]--- RIP: 0010:skb_panic+0x176/0x178 net/core/skbuff.c:109 Code: 80 7f fb 4c 8b 4d b8 8b 4b 70 41 57 45 89 f0 4c 89 ea ff 75 d0 4c 89 e6 48 c7 c7 60 ac f8 88 ff 75 c8 ff 75 c0 e8 72 ec 29 fb <0f> 0b e8 57 d8 40 fb 4c 8b 6d 08 e8 de 76 7f fb 48 c7 c1 00 b9 f8 RSP: 0018:ffffc90005387250 EFLAGS: 00010286 RAX: 0000000000000088 RBX: ffff8880971a9540 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815eae46 RDI: fffff52000a70e3c RBP: ffffc900053872b8 R08: 0000000000000088 R09: ffffed1015d26659 R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: ffffffff88f8b900 R13: ffffffff86fae679 R14: 000000000000002c R15: ffff888061ff0000 FS: 00007f420073b700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d322000 CR3: 000000009da76000 CR4: 00000000001406e0 DR0: 0000000020000c00 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600