kernel msg: ebtables bug: please report to author: Wrong len argument
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
IP: __list_del_entry_valid+0xd1/0x440 lib/list_debug.c:51
PGD 0 P4D 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 8477 Comm: syz-executor7 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xd1/0x440 lib/list_debug.c:51
RSP: 0018:ffff880147f2efd8 EFLAGS: 00010046
RAX: ffff8801502c8b60 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88014d4e8b60 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff880147f2f030 R08: 0000000001080020 R09: 0000000000000002
R10: ffff880150eff780 R11: 0000000180400039 R12: 0000000000000000
R13: ffffffff8a2336a8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000aa30000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 delete_and_unsubscribe_port+0x1a5/0x940 sound/core/seq/seq_ports.c:550
 snd_seq_port_disconnect+0x810/0x910 sound/core/seq/seq_ports.c:630
 snd_seq_ioctl_unsubscribe_port+0x7d7/0xb10 sound/core/seq/seq_clientmgr.c:1500
 snd_seq_kernel_client_ctl+0x555/0x5d0 sound/core/seq/seq_clientmgr.c:2360
 snd_seq_oss_midi_close+0x640/0x7f0 sound/core/seq/oss/seq_oss_midi.c:416
 snd_seq_oss_synth_reset+0x5f0/0xcd0 sound/core/seq/oss/seq_oss_synth.c:418
 snd_seq_oss_reset+0x97/0x360 sound/core/seq/oss/seq_oss_init.c:448
 snd_seq_oss_release+0xf2/0x3d0 sound/core/seq/oss/seq_oss_init.c:425
 odev_release+0x85/0xe0 sound/core/seq/oss/seq_oss.c:153
 __fput+0x49e/0xa10 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x243/0x2c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x10e1/0x38d0 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1320/0x1f20 kernel/signal.c:2469
 do_signal+0xb8/0x1c80 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265
 do_syscall_64+0x36d/0x430 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455979
RSP: 002b:00007f74921f1c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f74921f26d4 RCX: 0000000000455979
RDX: 00000000200000c0 RSI: 00000000c0a85352 RDI: 0000000000000013
RBP: 000000000072c0b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000031a R14: 00000000006f8b10 R15: 0000000000000003
Code: 15 4c 89 f8 4c 31 f0 4c 89 e1 48 f7 d1 48 21 c1 0f 84 76 01 00 00 4d 39 f7 0f 84 7e 01 00 00 41 89 de 4d 85 e4 0f 85 01 02 00 00 <4d> 8b 27 4c 89 ff e8 e4 79 cb fd 48 8b 18 44 8b 3a 48 89 d8 48 
RIP: __list_del_entry_valid+0xd1/0x440 lib/list_debug.c:51 RSP: ffff880147f2efd8
CR2: 0000000000000000
---[ end trace 29e74f25608e7917 ]---