------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:2285!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 18676 Comm: syz.3.3255 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pskb_expand_head+0x1114/0x1160 net/core/skbuff.c:2285
Code: c9 f3 ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 24 f4 ff ff 48 8b 3c 24 e8 a7 ed f5 f8 e9 16 f4 ff ff e8 dd ca 8f f8 90 <0f> 0b e8 d5 ca 8f f8 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900050f7188 EFLAGS: 00010283
RAX: ffffffff89312dd3 RBX: ffff888078a52c80 RCX: 0000000000080000
RDX: ffffc9000f8f3000 RSI: 00000000000002db RDI: 00000000000002dc
RBP: 00000000932edc40 R08: 0000000000000000 R09: 000000000000009c
R10: dffffc0000000000 R11: ffffffff89eacb10 R12: 00000000932edac0
R13: ffff888078a52c80 R14: 0000000000000820 R15: dffffc0000000000
FS:  00007f303d6f96c0(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2755b9 CR3: 00000000758c6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ipgre_header+0xd5/0x350 net/ipv4/ip_gre.c:900
 dev_hard_header include/linux/netdevice.h:3436 [inline]
 neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618
 neigh_output include/net/neighbour.h:556 [inline]
 ip_finish_output2+0xbb6/0x1000 net/ipv4/ip_output.c:237
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb+0x74/0x100 net/ipv4/ip_output.c:1508
 udp_send_skb+0xb04/0x1510 net/ipv4/udp.c:1195
 udp_sendmsg+0x1a71/0x2350 net/ipv4/udp.c:1485
 udpv6_sendmsg+0xc1c/0x2510 net/ipv6/udp.c:1545
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0xe5/0x270 net/socket.c:742
 sock_write_iter+0x279/0x360 net/socket.c:1195
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f303c78f749
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f303d6f9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f303c9e5fa0 RCX: 00007f303c78f749
RDX: 0000000000000080 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007f303c813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f303c9e6038 R14: 00007f303c9e5fa0 R15: 00007ffdcaa9c308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pskb_expand_head+0x1114/0x1160 net/core/skbuff.c:2285
Code: c9 f3 ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 24 f4 ff ff 48 8b 3c 24 e8 a7 ed f5 f8 e9 16 f4 ff ff e8 dd ca 8f f8 90 <0f> 0b e8 d5 ca 8f f8 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900050f7188 EFLAGS: 00010283
RAX: ffffffff89312dd3 RBX: ffff888078a52c80 RCX: 0000000000080000
RDX: ffffc9000f8f3000 RSI: 00000000000002db RDI: 00000000000002dc
RBP: 00000000932edc40 R08: 0000000000000000 R09: 000000000000009c
R10: dffffc0000000000 R11: ffffffff89eacb10 R12: 00000000932edac0
R13: ffff888078a52c80 R14: 0000000000000820 R15: dffffc0000000000
FS:  00007f303d6f96c0(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2755b9 CR3: 00000000758c6000 CR4: 00000000003526f0