skbuff: skb_under_panic: text:ffffffff8a83868b len:-1812861252 put:-1812861252 head:ffff88807c668340 data:ffff887fe8749544 tail:0xc0 end:0x180 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:209!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 6233 Comm: syz-executor.0 Not tainted 6.14.0-rc6-syzkaller-g4d872d51bc9d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:skb_panic net/core/skbuff.c:209 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:219
Code: 2e 8d 48 c7 c6 5a 54 4c 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 aa e4 62 f7 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90004b0f638 EFLAGS: 00010282
RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 814e3ee9648dc800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff888028469dd0 R08: ffffffff81a1358c R09: 1ffff92000961e60
R10: dffffc0000000000 R11: fffff52000961e61 R12: 0000000000000180
R13: ffff88807c668340 R14: ffff887fe8749544 R15: 00000000000000c0
FS:  00007f6f98bac6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f98bacd58 CR3: 0000000031f2e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_push+0xe5/0x100 net/core/skbuff.c:2546
 ipgre_header+0x6b/0x290 net/ipv4/ip_gre.c:891
 dev_hard_header include/linux/netdevice.h:3365 [inline]
 packet_snd net/packet/af_packet.c:3084 [inline]
 packet_sendmsg+0x42d9/0x6c30 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2659
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f97a798e9
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:00007f6f98bac0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6f97b8c100 RCX: 00007f6f97a798e9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007f6f97ad50d4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f6f97b8c100 R15: 00007ffebd64be88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic net/core/skbuff.c:209 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:219
Code: 2e 8d 48 c7 c6 5a 54 4c 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 aa e4 62 f7 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90004b0f638 EFLAGS: 00010282
RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 814e3ee9648dc800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff888028469dd0 R08: ffffffff81a1358c R09: 1ffff92000961e60
R10: dffffc0000000000 R11: fffff52000961e61 R12: 0000000000000180
R13: ffff88807c668340 R14: ffff887fe8749544 R15: 00000000000000c0
FS:  00007f6f98bac6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559e49b30680 CR3: 0000000031f2e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400