list_del corruption. prev->next should be 000000009141a831, but was           (null)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 21671 Comm: syz-executor1 Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x58 lib/list_debug.c:51
RSP: 0018:ffff8801affee8a0 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8801cb969e98 RCX: 0000000000000000
RDX: 0000000000000054 RSI: ffffffff815f6911 RDI: ffffed0035ffdd0a
RBP: ffff8801affee8b8 R08: ffff8801aa3e0300 R09: ffffed003b604fb0
R10: ffffed003b604fb0 R11: ffff8801db027d87 R12: ffffffff898e20a0
R13: ffffffffffffffff R14: ffff8801d8b89e40 R15: ffff8801cb969e98
FS:  00007f64e071a700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f08d7d61518 CR3: 000000019f6df000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 00000000200003c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 tipc_nametbl_unsubscribe+0x3d3/0xaf0 net/tipc/name_table.c:708
 tipc_sub_unsubscribe+0x6d/0x305 net/tipc/subscr.c:164
 tipc_conn_delete_sub+0x32d/0x530 net/tipc/topsrv.c:245
 tipc_topsrv_kern_unsubscr+0x280/0x3f0 net/tipc/topsrv.c:598
 tipc_group_delete+0x2dd/0x3f0 net/tipc/group.c:231
 tipc_sk_leave+0x10e/0x210 net/tipc/socket.c:2800
 tipc_release+0x146/0x1290 net/tipc/socket.c:576
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x90/0x2020 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455319
RSP: 002b:00007f64e0719ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455319
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000034 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffec958684f R14: 00007f64e071a9c0 R15: 0000000000000000
Code: 20 1b d8 87 e8 aa de 2c fe 0f 0b 48 89 de 48 c7 c7 40 1c d8 87 e8 99 de 2c fe 0f 0b 48 89 de 48 c7 c7 e0 1b d8 87 e8 88 de 2c fe <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 
RIP: __list_del_entry_valid.cold.1+0x48/0x58 lib/list_debug.c:51 RSP: ffff8801affee8a0
---[ end trace 91cb0611b4481ca0 ]---