IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready skbuff: skb_over_panic: text:00000000f93d41bc len:56 put:8 head:0000000049f8bad0 data:000000006f2e65db tail:0xc8 end:0xc0 dev:ip6tnl0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:104! invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI Modules linked in: CPU: 1 PID: 1557 Comm: syz-executor.3 Not tainted 4.14.155-syzkaller #0 task: 00000000dabff010 task.stack: 000000005900b3ec RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: 0018:ffff8881dbb079d8 EFLAGS: 00010286 RAX: 0000000000000085 RBX: ffff8881cb7c0dc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8c66a380 RDI: ffffed103b760f2d RBP: ffffffff8c889fe0 R08: 0000000000000085 R09: ffffed103b764ce9 R10: ffffed103b764ce8 R11: ffff8881dbb26747 R12: ffffffff8bf85d2e R13: 0000000000000008 R14: ffff8881a6fbd500 R15: 00000000000000c0 FS: 000000000158d940(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001214978 CR3: 00000001d9ec4001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <IRQ> skb_over_panic net/core/skbuff.c:109 [inline] skb_put.cold+0x24/0x24 net/core/skbuff.c:1699 mld_newpack+0x4ce/0x7a0 net/ipv6/mcast.c:1608 add_grhead.isra.0+0x29c/0x370 net/ipv6/mcast.c:1691 add_grec+0x6a3/0xf10 net/ipv6/mcast.c:1822 mld_send_cr net/ipv6/mcast.c:1948 [inline] mld_ifc_timer_expire+0x340/0x7e0 net/ipv6/mcast.c:2455 call_timer_fn+0x15b/0x6a0 kernel/time/timer.c:1279 expire_timers+0x227/0x4c0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1636 [inline] run_timer_softirq+0x1eb/0x5d0 kernel/time/timer.c:1649 __do_softirq+0x234/0x9ec kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x114/0x150 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x1a7/0x650 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792 </IRQ> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x59/0x70 kernel/locking/spinlock.c:192 RSP: 0018:ffff8881a4a37ad0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: 0000000000000206 RCX: 1ffff11038e1e404 RDX: 0000000000000000 RSI: ffff8881c70f2028 RDI: 0000000000000206 RBP: ffffffff8e223f60 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000206 R13: 000000000000002c R14: 0000000000000001 R15: dffffc0000000000 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] avc_reclaim_node security/selinux/avc.c:539 [inline] avc_alloc_node security/selinux/avc.c:557 [inline] avc_alloc_node+0x2bb/0x3f0 security/selinux/avc.c:545 avc_insert security/selinux/avc.c:668 [inline] avc_compute_av+0x17c/0x550 security/selinux/avc.c:974 avc_has_perm_noaudit security/selinux/avc.c:1110 [inline] avc_has_perm+0x318/0x350 security/selinux/avc.c:1144 may_link+0x2a3/0x380 security/selinux/hooks.c:2002 security_inode_unlink+0xd6/0x120 security/security.c:629 vfs_unlink2+0x100/0x470 fs/namei.c:4152 do_unlinkat+0x327/0x5e0 fs/namei.c:4228 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a387 RSP: 002b:00007ffc9cc20588 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045a387 RDX: 00007ffc9cc205a0 RSI: 00007ffc9cc205a0 RDI: 00007ffc9cc20630 RBP: 0000000000000c87 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffc9cc216c0 R13: 000000000158e940 R14: 0000000000000000 R15: 00007ffc9cc216c0 Code: 20 ff 4c 8b 4c 24 10 8b 4b 78 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 00 9a 88 8c ff 74 24 10 ff 74 24 20 e8 e9 a3 ee fe <0f> 0b e8 87 7e fd fe 4c 8b 64 24 18 e8 5d 44 20 ff 48 c7 c1 a0 RIP: skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: ffff8881dbb079d8 ---[ end trace a058b9532bc98b81 ]---