IPv6: ADDRCONF(NETDEV_CHANGE): ÿ: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): ÿ: link becomes ready skbuff: skb_over_panic: text:00000000efcb0b97 len:56 put:8 head:000000004d5abd50 data:00000000f509a83a 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: 0 PID: 7998 Comm: syz-executor.5 Not tainted 4.14.156-syzkaller #0 task: 000000002a73a0bb task.stack: 0000000099994a7d RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: 0018:ffff8881dba079d8 EFLAGS: 00010286 RAX: 0000000000000085 RBX: ffff8881b88328c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8826a420 RDI: ffffed103b740f2d RBP: ffffffff8848a0a0 R08: 0000000000000085 R09: ffffed103b744ce9 R10: ffffed103b744ce8 R11: ffff8881dba26747 R12: ffffffff87b8600e R13: 0000000000000008 R14: ffff8881caf15500 R15: 00000000000000c0 FS: 00007fef05df4700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f222000 CR3: 00000001bcbd8003 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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 RIP: 0010:bdi_cap_stable_pages_required include/linux/backing-dev.h:183 [inline] RIP: 0010:wait_for_stable_page+0xde/0x260 mm/page-writeback.c:2841 RSP: 0018:ffff8881cc5772f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8881d8dbd500 RCX: 0000000000040000 RDX: 1ffff1103ab2f465 RSI: ffffc9000897b000 RDI: ffff8881d597a328 RBP: ffffea00062b3340 R08: 0000000000000001 R09: 0000000000000002 R10: fffffbfff1186145 R11: ffffffff88c30a2b R12: ffff88818d633a98 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000333 grab_cache_page_write_begin+0x78/0x90 mm/filemap.c:3086 ext4_da_write_begin+0x2dd/0x10c0 fs/ext4/inode.c:3087 generic_perform_write+0x1d2/0x460 mm/filemap.c:3133 __generic_file_write_iter+0x32e/0x550 mm/filemap.c:3258 ext4_file_write_iter+0x58f/0xdb0 fs/ext4/file.c:268 call_write_iter include/linux/fs.h:1798 [inline] do_iter_readv_writev+0x379/0x580 fs/read_write.c:679 do_iter_write fs/read_write.c:958 [inline] do_iter_write+0x152/0x550 fs/read_write.c:939 vfs_iter_write+0x70/0xa0 fs/read_write.c:971 iter_file_splice_write+0x560/0xa50 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x118/0x160 fs/splice.c:1018 splice_direct_to_actor+0x292/0x760 fs/splice.c:973 do_splice_direct+0x177/0x240 fs/splice.c:1061 do_sendfile+0x493/0xb20 fs/read_write.c:1445 SYSC_sendfile64 fs/read_write.c:1500 [inline] SyS_sendfile64+0xab/0x140 fs/read_write.c:1492 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a679 RSP: 002b:00007fef05df3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a679 RDX: 0000000020000240 RSI: 000000000000000b RDI: 000000000000000b RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007fff R11: 0000000000000246 R12: 00007fef05df46d4 R13: 00000000004c8652 R14: 00000000004df368 R15: 00000000ffffffff 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 c0 9a 48 88 ff 74 24 10 ff 74 24 20 e8 49 a3 ee fe <0f> 0b e8 e7 7d fd fe 4c 8b 64 24 18 e8 bd 43 20 ff 48 c7 c1 60 RIP: skb_panic+0x16c/0x16e net/core/skbuff.c:104 RSP: ffff8881dba079d8 ---[ end trace 3bc6068b3cdc2a5f ]---