skbuff: skb_over_panic: text:ffffffff843292a3 len:76 put:20 head:ffff8881199b2000 data:ffff8881199b2040 tail:0x8c end:0x80 dev:syztnl0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 15760 Comm: kworker/1:5 Tainted: G W 5.10.149-syzkaller-01350-g0118fb827bc7 #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:106 Code: c7 00 2d 79 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 35 06 d1 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:ffffc90000ec78d0 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88815391e000 RCX: a55f2e78ba7efc00 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc90000ec7918 R08: ffffffff8153d2f8 R09: ffffed103ee2a5e8 R10: ffffed103ee2a5e8 R11: 1ffff1103ee2a5e7 R12: ffff8881199b2040 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ab9bf2058 CR3: 0000000151ca3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic net/core/skbuff.c:115 [inline] skb_put+0x153/0x210 net/core/skbuff.c:1877 add_grhead net/ipv6/mcast.c:1711 [inline] add_grec+0xf73/0x13d0 net/ipv6/mcast.c:1838 mld_send_initial_cr+0x1f8/0x2c0 net/ipv6/mcast.c:2088 ipv6_mc_dad_complete+0x70/0x3b0 net/ipv6/mcast.c:2100 addrconf_dad_completed+0x743/0xe30 net/ipv6/addrconf.c:4236 addrconf_dad_work+0xd72/0x15d0 net/ipv6/addrconf.c:4020 process_one_work+0x726/0xc10 kernel/workqueue.c:2296 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442 kthread+0x349/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 Modules linked in: ---[ end trace cad0386d8e8427e2 ]--- RIP: 0010:skb_panic+0x14c/0x150 net/core/skbuff.c:106 Code: c7 00 2d 79 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 35 06 d1 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:ffffc90000ec78d0 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88815391e000 RCX: a55f2e78ba7efc00 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc90000ec7918 R08: ffffffff8153d2f8 R09: ffffed103ee2a5e8 R10: ffffed103ee2a5e8 R11: 1ffff1103ee2a5e7 R12: ffff8881199b2040 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ab9bf2058 CR3: 0000000151ca3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400