syzbot

skbuff: skb_over_panic: text:ffffffff845d9324 len:76 put:20 head:ffff88810e53e400 data:ffff88810e53e440 tail:0x8c end:0x80 dev:syztnl1
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kernel BUG at net/core/skbuff.c:113!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 423 Comm: kworker/0:2 Not tainted 5.15.74-syzkaller-00001-g4ec71a9ec769 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_panic+0x14c/0x150 net/core/skbuff.c:113
Code: c7 a0 70 be 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 31 c0 53 41 56 41 55 41 54 e8 03 fe dc 00 48 83 c4 20 <0f> 0b 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 78 4c
RSP: 0018:ffffc9000033f8c8 EFLAGS: 00010282
RAX: 0000000000000086 RBX: ffff88810b756000 RCX: bea430fce5d36e00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000033f910 R08: ffffffff815838e9 R09: ffffed103ee065e8
R10: ffffed103ee065e8 R11: 1ffff1103ee065e7 R12: ffff88810e53e440
R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010d1b0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_over_panic net/core/skbuff.c:118 [inline]
 skb_put+0x153/0x210 net/core/skbuff.c:2039
 add_grhead net/ipv6/mcast.c:1855 [inline]
 add_grec+0xf74/0x13d0 net/ipv6/mcast.c:1989
 mld_send_initial_cr net/ipv6/mcast.c:2236 [inline]
 ipv6_mc_dad_complete+0x246/0x5f0 net/ipv6/mcast.c:2247
 addrconf_dad_completed+0x733/0xe20 net/ipv6/addrconf.c:4248
 addrconf_dad_work+0xd8f/0x1680
 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313
 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460
 kthread+0x41c/0x500 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in:
---[ end trace 7e3eaf38d94d6fae ]---
RIP: 0010:skb_panic+0x14c/0x150 net/core/skbuff.c:113
Code: c7 a0 70 be 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 31 c0 53 41 56 41 55 41 54 e8 03 fe dc 00 48 83 c4 20 <0f> 0b 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 78 4c
RSP: 0018:ffffc9000033f8c8 EFLAGS: 00010282
RAX: 0000000000000086 RBX: ffff88810b756000 RCX: bea430fce5d36e00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000033f910 R08: ffffffff815838e9 R09: ffffed103ee065e8
R10: ffffed103ee065e8 R11: 1ffff1103ee065e7 R12: ffff88810e53e440
R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000680f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400