skbuff: skb_over_panic: text:ffffffff843bcaae len:76 put:20 head:ffff8881429ef400 data:ffff8881429ef440 tail:0x8c end:0x80 dev:syztnl1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 382 Comm: kworker/0:2 Not tainted 5.10.94-syzkaller-00566-g34fd8cb7e75c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 7c 07 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc90000c87880 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88811cbae000 RCX: 7c7e7451a93a5a00 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc90000c878c8 R08: ffffffff815459d8 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff8881429ef440 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed22000 CR3: 0000000116337000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:115 skb_put+0x205/0x210 net/core/skbuff.c:1877 add_grhead net/ipv6/mcast.c:1711 [inline] add_grec+0xf5e/0x1370 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+0x664/0xdc0 net/ipv6/addrconf.c:4204 addrconf_dad_work+0xe4b/0x1d40 net/ipv6/addrconf.c:3989 process_one_work+0x6b4/0xfb0 kernel/workqueue.c:2298 worker_thread+0xb15/0x1600 kernel/workqueue.c:2444 kthread+0x371/0x390 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Modules linked in: ---[ end trace ca5cee3af3f75cd5 ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 7c 07 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc90000c87880 EFLAGS: 00010282 RAX: 0000000000000086 RBX: ffff88811cbae000 RCX: 7c7e7451a93a5a00 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc90000c878c8 R08: ffffffff815459d8 R09: ffffed103ee0a5d8 R10: ffffed103ee0a5d8 R11: 0000000000000000 R12: ffff8881429ef440 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed22000 CR3: 0000000116337000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400