kernel BUG at net/core/skbuff.c:209! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6591 Comm: syz-executor.0 Not tainted 6.15.0-rc7-syzkaller-ga5806cd506af #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:209 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 40 58 c0 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 2a 61 59 f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 d4 91 df f8 4c RSP: 0018:ffffc900053ef7f8 EFLAGS: 00010286 RAX: 0000000000000099 RBX: ffff88807c38c8c0 RCX: ffffffff819aa5d9 RDX: 0000000000000000 RSI: ffffffff819b2466 RDI: 0000000000000005 RBP: ffffffff8cc06ba0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff89fb6ef8 R13: 0000000095b0d724 R14: ffffffff8cc05800 R15: 0000000000000180 FS: 00007f6a247536c0(0000) GS:ffff8881249da000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a24753d58 CR3: 000000002e3cd000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_under_panic net/core/skbuff.c:219 [inline] skb_push+0xca/0xf0 net/core/skbuff.c:2608 ipgre_header+0x68/0x530 net/ipv4/ip_gre.c:895 dev_hard_header include/linux/netdevice.h:3402 [inline] packet_snd net/packet/af_packet.c:3083 [inline] packet_sendmsg+0x4164/0x56f0 net/packet/af_packet.c:3163 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6a23a7bdb9 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6a247530c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6a23b9c120 RCX: 00007f6a23a7bdb9 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004 RBP: 00007f6a23ad8ad0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f6a23b9c120 R15: 00007ffde918c208 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:209 Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 40 58 c0 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 2a 61 59 f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 d4 91 df f8 4c RSP: 0018:ffffc900053ef7f8 EFLAGS: 00010286 RAX: 0000000000000099 RBX: ffff88807c38c8c0 RCX: ffffffff819aa5d9 RDX: 0000000000000000 RSI: ffffffff819b2466 RDI: 0000000000000005 RBP: ffffffff8cc06ba0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff89fb6ef8 R13: 0000000095b0d724 R14: ffffffff8cc05800 R15: 0000000000000180 FS: 00007f6a247536c0(0000) GS:ffff8881249da000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a24753d58 CR3: 000000002e3cd000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400