skbuff: skb_under_panic: text:ffffffff89db9007 len:-1826255148 put:-1826255204 head:ffff88806da86a40 data:ffff887fda82dbe4 tail:0x78 end:0x180 dev:bond2
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:213!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 20 2f 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 1e 95 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:ffffc900001172f8 EFLAGS: 00010282
RAX: 0000000000000098 RBX: dffffc0000000000 RCX: 32193e0a9870ee00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90000117007 R09: 1ffff92000022e00
R10: dffffc0000000000 R11: fffff52000022e01 R12: ffff88807de62510
R13: ffff88806da86a40 R14: ffff887fda82dbe4 R15: 0000000000000078
FS:  0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3335e6 CR3: 000000007e2b4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 skb_under_panic net/core/skbuff.c:223 [inline]
 skb_push+0xc3/0xe0 net/core/skbuff.c:2641
 ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:895
 dev_hard_header include/linux/netdevice.h:3435 [inline]
 neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618
 neigh_output include/net/neighbour.h:556 [inline]
 ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512
 addrconf_dad_completed+0x7ae/0xd60 net/ipv6/addrconf.c:4360
 addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 20 2f 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 1e 95 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:ffffc900001172f8 EFLAGS: 00010282
RAX: 0000000000000098 RBX: dffffc0000000000 RCX: 32193e0a9870ee00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90000117007 R09: 1ffff92000022e00
R10: dffffc0000000000 R11: fffff52000022e01 R12: ffff88807de62510
R13: ffff88806da86a40 R14: ffff887fda82dbe4 R15: 0000000000000078
FS:  0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f4c81dd58 CR3: 000000007e2b4000 CR4: 00000000003526f0