skbuff: skb_under_panic: text:ffffffff89ee1958 len:-1783575060 put:-1783575060 head:ffff88803232b0c0 data:ffff887f9c81e394 tail:0xc0 end:0x180 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:212!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 6274 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+0x157/0x1d0 net/core/skbuff.c:212
Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 20 be bf 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 aa cd 6a f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 b4 ed f4 f8 4c
RSP: 0018:ffffc90004c177e0 EFLAGS: 00010286
RAX: 0000000000000099 RBX: ffff8880323588c0 RCX: ffffffff819adb09
RDX: 0000000000000000 RSI: ffffffff819b5636 RDI: 0000000000000005
RBP: ffffffff8cbfd1e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff89ee1958
R13: 0000000095b0cdec R14: ffffffff8cbfbde0 R15: 0000000000000180
FS:  00007fc8238686c0(0000) GS:ffff8881249df000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc823868d58 CR3: 000000004b771000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 skb_under_panic net/core/skbuff.c:222 [inline]
 skb_push+0xca/0xf0 net/core/skbuff.c:2602
 ipgre_header+0x68/0x530 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+0x40c4/0x5850 net/packet/af_packet.c:3108
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
 __sys_sendmsg+0x16d/0x220 net/socket.c:2716
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc822a7bdb9
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:00007fc8238680c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc822b9c120 RCX: 00007fc822a7bdb9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007fc822ad8ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc822b9c120 R15: 00007fff2d683108
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x1d0 net/core/skbuff.c:212
Code: b6 04 01 84 c0 74 04 3c 03 7e 21 41 56 8b 4b 70 45 89 e8 48 c7 c7 20 be bf 8c 41 57 56 48 89 ee 52 4c 89 e2 e8 aa cd 6a f8 90 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 b4 ed f4 f8 4c
RSP: 0018:ffffc90004c177e0 EFLAGS: 00010286

RAX: 0000000000000099 RBX: ffff8880323588c0 RCX: ffffffff819adb09
RDX: 0000000000000000 RSI: ffffffff819b5636 RDI: 0000000000000005
RBP: ffffffff8cbfd1e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff89ee1958
R13: 0000000095b0cdec R14: ffffffff8cbfbde0 R15: 0000000000000180
FS:  00007fc8238686c0(0000) GS:ffff8881249df000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc823868d58 CR3: 000000004b771000 CR4: 00000000003526f0