ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 26901 at lib/refcount.c:187 refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 26901 Comm: syz-executor4 Not tainted 4.20.0-rc3+ #313
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187
Code: 89 de e8 8a 1c ed fd 84 db 74 07 31 db e9 4d ff ff ff e8 aa 1b ed fd 48 c7 c7 20 b2 60 88 c6 05 49 62 80 06 01 e8 f7 7b b6 fd <0f> 0b 31 db e9 2c ff ff ff 48 89 cf e8 26 6b 30 fe e9 41 fe ff ff
RSP: 0018:ffff8881daf06000 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff8165eaf5 RDI: 0000000000000005
RBP: ffff8881daf060e8 R08: ffff8881b66b21c0 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8881b66b21c0 R12: ffff8881cbc1fa3c
R13: 00000000ffff8701 R14: ffff8881daf060c0 R15: ffff8881b53f1140
 sock_wfree+0xb8/0x180 net/core/sock.c:1821
 sctp_wfree+0x3a8/0xb40 net/sctp/socket.c:8586
 skb_release_head_state+0x15f/0x2e0 net/core/skbuff.c:612
 skb_release_all+0x15/0x60 net/core/skbuff.c:625
 __kfree_skb net/core/skbuff.c:641 [inline]
 consume_skb+0x1ae/0x570 net/core/skbuff.c:701
 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1462 [inline]
 sctp_chunk_put+0x2d4/0x450 net/sctp/sm_make_chunk.c:1489
 sctp_datamsg_destroy net/sctp/chunk.c:128 [inline]
 sctp_datamsg_put+0x28b/0x620 net/sctp/chunk.c:145
 sctp_chunk_free+0x46/0x60 net/sctp/sm_make_chunk.c:1474
 __sctp_outq_teardown+0xa8e/0x11f0 net/sctp/outqueue.c:271
 sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
 sctp_association_free+0x2f0/0x972 net/sctp/associola.c:361
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1353 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x4a32/0x7180 net/sctp/sm_sideeffect.c:1191
 sctp_assoc_bh_rcv+0x346/0x670 net/sctp/associola.c:1073
 sctp_inq_push+0x280/0x370 net/sctp/inqueue.c:95
 sctp_rcv+0x2e50/0x4170 net/sctp/input.c:271
 sctp6_rcv+0x15/0x30 net/sctp/ipv6.c:1064
 ip6_protocol_deliver_rcu+0x381/0x1950 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x17a/0x330 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ipv6_rcv+0x115/0x640 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4948
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5058
 process_backlog+0x24e/0x7a0 net/core/dev.c:5870
 napi_poll net/core/dev.c:6293 [inline]
 net_rx_action+0x7fa/0x19b0 net/core/dev.c:6359
 __do_softirq+0x308/0xb7e kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1023
 </IRQ>
 do_softirq.part.14+0x126/0x160 kernel/softirq.c:337
 do_softirq kernel/softirq.c:329 [inline]
 __local_bh_enable_ip+0x21d/0x260 kernel/softirq.c:189
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
 ip6_finish_output2+0xce4/0x27a0 net/ipv6/ip6_output.c:121
kobject: 'loop5' (0000000028e9ad00): kobject_uevent_env
kobject: 'loop5' (0000000028e9ad00): fill_kobj_path: path = '/devices/virtual/block/loop5'
 ip6_finish_output+0x58c/0xc60 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip6_xmit+0xf69/0x23e0 net/ipv6/ip6_output.c:275
kobject: 'loop2' (00000000d17c6b6d): kobject_uevent_env
kobject: 'loop2' (00000000d17c6b6d): fill_kobj_path: path = '/devices/virtual/block/loop2'
 sctp_v6_xmit+0x385/0x760 net/sctp/ipv6.c:233
 sctp_packet_transmit+0x1f16/0x3ca0 net/sctp/output.c:640
 sctp_outq_flush_transports net/sctp/outqueue.c:1161 [inline]
 sctp_outq_flush+0x610/0x34f0 net/sctp/outqueue.c:1209
 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:772
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1349 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x4f1c/0x7180 net/sctp/sm_sideeffect.c:1191
 sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
 sctp_close+0x278/0xad0 net/sctp/socket.c:1540
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ad6/0x26d0 kernel/exit.c:867
 do_group_exit+0x177/0x440 kernel/exit.c:970
 get_signal+0x8b0/0x1980 kernel/signal.c:2517
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x533/0x5e0 arch/x86/entry/common.c:268
 ret_from_fork+0x15/0x50 arch/x86/entry/entry_64.S:344
RIP: 0033:0x459f39
Code: ff 48 85 f6 0f 84 27 8a fb ff 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 0f 8c fe 89 fb ff 74 01 c3 31 ed 48 f7 c7 00 00 01 00 75
RSP: 002b:00007f19d49bbdb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007f19d49bc700 RCX: 0000000000459f39
RDX: 00007f19d49bc9d0 RSI: 00007f19d49bbdb0 RDI: 00000000003d0f00
RBP: 00007ffd6ee71640 R08: 00007f19d49bc700 R09: 00007f19d49bc700
R10: 00007f19d49bc9d0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd6ee714ef R14: 00007f19d49bc9c0 R15: 0000000000000002
Kernel Offset: disabled
Rebooting in 86400 seconds..