skbuff: skb_over_panic: text:ffffffff8436236e len:76 put:20 head:ffff888116cee400 data:ffff888116cee440 tail:0x8c end:0x80 dev:security ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15480 Comm: kworker/0:5 Tainted: G W 5.10.104-syzkaller-00360-g0773736e480c #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 8c c0 8e 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:ffffc90002867880 EFLAGS: 00010282 RAX: 0000000000000087 RBX: ffff88812ccea000 RCX: c3fa0260d83c0400 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc900028678c8 R08: ffffffff81544d48 R09: fffff5200050ce39 R10: fffff5200050ce39 R11: 0000000000000000 R12: ffff888116cee440 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33022000 CR3: 000000000640f000 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:4221 addrconf_dad_work+0xe4b/0x1d40 net/ipv6/addrconf.c:4006 process_one_work+0x6b4/0xfb0 kernel/workqueue.c:2296 worker_thread+0xb15/0x1600 kernel/workqueue.c:2442 kthread+0x371/0x390 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Modules linked in: ---[ end trace 60e8266131ee68f9 ]--- 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 8c c0 8e 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:ffffc90002867880 EFLAGS: 00010282 RAX: 0000000000000087 RBX: ffff88812ccea000 RCX: c3fa0260d83c0400 RDX: 0000000000000000 RSI: 0000000000000402 RDI: 0000000000000000 RBP: ffffc900028678c8 R08: ffffffff81544d48 R09: fffff5200050ce39 R10: fffff5200050ce39 R11: 0000000000000000 R12: ffff888116cee440 R13: 000000000000008c R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33022000 CR3: 000000000640f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400