skbuff: skb_under_panic: text:ffffffff89de8bc7 len:-1824558092 put:-1824558092 head:ffff88807bc5e700 data:ffff887fe88673cc tail:0xc0 end:0x180 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:212!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6123 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:212
Code: c7 60 0c 6e 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 6e 54 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:ffffc90004b6f5c0 EFLAGS: 00010286
RAX: 0000000000000099 RBX: dffffc0000000000 RCX: f999680b4f7e5c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90004b6f2c7 R09: 1ffff9200096de58
R10: dffffc0000000000 R11: fffff5200096de59 R12: ffff888029a1c8d0
R13: ffff88807bc5e700 R14: ffff887fe88673cc R15: 00000000000000c0
FS:  00007fbb4a3956c0(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb4a395d58 CR3: 0000000074012000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 skb_under_panic net/core/skbuff.c:222 [inline]
 skb_push+0xc3/0xe0 net/core/skbuff.c:2602
 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:895
 dev_hard_header include/linux/netdevice.h:3419 [inline]
 packet_snd net/packet/af_packet.c:3028 [inline]
 packet_sendmsg+0x35cd/0x5080 net/packet/af_packet.c:3108
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x830 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb492798e9
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:00007fbb4a3950c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbb4938c100 RCX: 00007fbb492798e9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007fbb492d50d4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fbb4938c100 R15: 00007ffdd4523de8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:212
Code: c7 60 0c 6e 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 6e 54 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:ffffc90004b6f5c0 EFLAGS: 00010286

RAX: 0000000000000099 RBX: dffffc0000000000 RCX: f999680b4f7e5c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90004b6f2c7 R09: 1ffff9200096de58
R10: dffffc0000000000 R11: fffff5200096de59 R12: ffff888029a1c8d0
R13: ffff88807bc5e700 R14: ffff887fe88673cc R15: 00000000000000c0
FS:  00007fbb4a3956c0(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb4a395d58 CR3: 0000000074012000 CR4: 00000000003526f0