skbuff: skb_under_panic: text:ffffffff88f6f4fe len:47 put:44 head:ffff88804cc8aa00 data:ffff88804cc8a9d8 tail:0x7 end:0x140 dev:ip6gre0.0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:192! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 23146 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-11989-g6843306689af #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:skb_panic+0x152/0x1d0 net/core/skbuff.c:192 Code: 0f b6 04 01 84 c0 74 04 3c 03 7e 20 8b 4b 70 41 56 45 89 e8 48 c7 c7 00 bb 7f 8b 41 57 56 48 89 ee 52 4c 89 e2 e8 6e c1 54 f9 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 c9 49 c4 f9 4c RSP: 0018:ffffc9000371f600 EFLAGS: 00010282 RAX: 0000000000000089 RBX: ffff888053b6ec80 RCX: ffffc90003d6f000 RDX: 0000000000000000 RSI: ffffffff8169197c RDI: 0000000000000005 RBP: ffffffff8b7fc9e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 00000000000456d0 R12: ffffffff88f6f4fe R13: 000000000000002c R14: ffff888030836000 R15: 0000000000000140 FS: 00007ff98170b700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3c964d56be CR3: 000000004ad40000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_under_panic net/core/skbuff.c:202 [inline] skb_push+0xc8/0xe0 net/core/skbuff.c:2395 ip6gre_header+0xbe/0x8f0 net/ipv6/ip6_gre.c:1383 dev_hard_header include/linux/netdevice.h:3144 [inline] vlan_dev_hard_header+0x141/0x510 net/8021q/vlan_dev.c:83 dev_hard_header include/linux/netdevice.h:3144 [inline] llc_mac_hdr_init+0x133/0x190 net/llc/llc_output.c:33 llc_sap_action_send_test_c+0x1b1/0x2c0 net/llc/llc_s_ac.c:141 llc_exec_sap_trans_actions net/llc/llc_sap.c:153 [inline] llc_sap_next_state net/llc/llc_sap.c:182 [inline] llc_sap_state_process+0x22f/0x500 net/llc/llc_sap.c:209 llc_ui_sendmsg+0x9fa/0x1150 net/llc/af_llc.c:984 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xde/0x190 net/socket.c:748 ____sys_sendmsg+0x34a/0x920 net/socket.c:2494 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2548 __sys_sendmmsg+0x18f/0x460 net/socket.c:2634 __do_sys_sendmmsg net/socket.c:2663 [inline] __se_sys_sendmmsg net/socket.c:2660 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2660 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff980a8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff98170b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007ff980babf80 RCX: 00007ff980a8c389 RDX: 0000000000000004 RSI: 0000000020001540 RDI: 0000000000000004 RBP: 00007ff980ad7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe9e15e4f R14: 00007ff98170b300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x152/0x1d0 net/core/skbuff.c:192 Code: 0f b6 04 01 84 c0 74 04 3c 03 7e 20 8b 4b 70 41 56 45 89 e8 48 c7 c7 00 bb 7f 8b 41 57 56 48 89 ee 52 4c 89 e2 e8 6e c1 54 f9 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 c9 49 c4 f9 4c RSP: 0018:ffffc9000371f600 EFLAGS: 00010282 RAX: 0000000000000089 RBX: ffff888053b6ec80 RCX: ffffc90003d6f000 RDX: 0000000000000000 RSI: ffffffff8169197c RDI: 0000000000000005 RBP: ffffffff8b7fc9e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 00000000000456d0 R12: ffffffff88f6f4fe R13: 000000000000002c R14: ffff888030836000 R15: 0000000000000140 FS: 00007ff98170b700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020087000 CR3: 000000004ad40000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400