skbuff: skb_under_panic: text:ffffffff89ee5b67 len:-1826346012 put:-1826346012 head:ffff888033df5040 data:ffff887fa0bb251c tail:0xc0 end:0x180 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:209! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 6322 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+0x157/0x160 net/core/skbuff.c:209 Code: c7 20 12 70 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 ce 40 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900052b75e0 EFLAGS: 00010282 RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 8b06363191ca5300 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000180 R08: ffffc900052b72a7 R09: 1ffff92000a56e54 R10: dffffc0000000000 R11: fffff52000a56e55 R12: ffff888033bb58d0 R13: ffff888033df5040 R14: ffff887fa0bb251c R15: 00000000000000c0 FS: 00007f503af296c0(0000) GS:ffff8881261c2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f503af29d58 CR3: 000000002face000 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+0xc3/0xe0 net/core/skbuff.c:2608 ipgre_header+0x67/0x290 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+0x3893/0x5400 net/packet/af_packet.c:3163 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5039e798e9 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:00007f503af290c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5039f8c100 RCX: 00007f5039e798e9 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004 RBP: 00007f5039ed50d4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f5039f8c100 R15: 00007ffc0e2122d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:209 Code: c7 20 12 70 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 ce 40 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900052b75e0 EFLAGS: 00010282 RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 8b06363191ca5300 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000180 R08: ffffc900052b72a7 R09: 1ffff92000a56e54 R10: dffffc0000000000 R11: fffff52000a56e55 R12: ffff888033bb58d0 R13: ffff888033df5040 R14: ffff887fa0bb251c R15: 00000000000000c0 FS: 00007f503af296c0(0000) GS:ffff8881261c2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f503af29d58 CR3: 000000002face000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400