syzbot

skbuff: skb_under_panic: text:ffffffff8a3cc69b len:-1816127840 put:-1816127916 head:ffff888022b2e000 data:ffff887f8ef2ca6c tail:0x10c end:0x6c0 dev:bond0
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kernel BUG at net/core/skbuff.c:205!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.11.0-rc5-syzkaller-00217-g031ae72825ce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_panic net/core/skbuff.c:205 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:215
Code: 0c 8d 48 c7 c6 0e 7c 21 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 9a ce 35 02 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:ffffc90000117350 EFLAGS: 00010286
RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 1f4aa17658f9df00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880633eab50 R08: ffffffff8174013c R09: 1ffff92000022e04
R10: dffffc0000000000 R11: fffff52000022e05 R12: 00000000000006c0
R13: ffff888022b2e000 R14: ffff887f8ef2ca6c R15: 000000000000010c
FS:  0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f744d1ded58 CR3: 000000002a66a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_push+0xe5/0x100 net/core/skbuff.c:2617
 ipgre_header+0x6b/0x440 net/ipv4/ip_gre.c:890
 dev_hard_header include/linux/netdevice.h:3159 [inline]
 neigh_connected_output+0x27f/0x450 net/core/neighbour.c:1589
 neigh_output include/net/neighbour.h:542 [inline]
 ip6_finish_output2+0x1001/0x1730 net/ipv6/ip6_output.c:141
 ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:226
 NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314
 mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1818
 ipv6_mc_dad_complete+0x88/0x490 net/ipv6/mcast.c:2244
 addrconf_dad_completed+0x712/0xcd0 net/ipv6/addrconf.c:4340
 addrconf_dad_work+0xdc2/0x16f0
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic net/core/skbuff.c:205 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:215
Code: 0c 8d 48 c7 c6 0e 7c 21 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 9a ce 35 02 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:ffffc90000117350 EFLAGS: 00010286
RAX: 0000000000000099 RBX: dffffc0000000000 RCX: 1f4aa17658f9df00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880633eab50 R08: ffffffff8174013c R09: 1ffff92000022e04
R10: dffffc0000000000 R11: fffff52000022e05 R12: 00000000000006c0
R13: ffff888022b2e000 R14: ffff887f8ef2ca6c R15: 000000000000010c
FS:  0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33110ff8 CR3: 000000007e520000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400