list_del corruption. prev->next should be 00000000a698d9cd, 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: 1 PID: 17032 Comm: syz-executor6 Not tainted 4.16.0-rc6+ #286
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xef/0x150 lib/list_debug.c:51
RSP: 0018:ffff8801d123ea68 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffffffff886eefe0 RCX: 0000000000000000
RDX: 0000000000000054 RSI: 1ffff1003a247d02 RDI: ffffed003a247d41
RBP: ffff8801d123ea80 R08: 0000000000000000 R09: 1ffff1003a247ca9
R10: ffff8801d123e948 R11: ffffffff87b3b618 R12: ffffffffffffffff
R13: ffff8801d123ec20 R14: ffff8801c4690e58 R15: ffff8801cef06240
FS:  00007f2fba911700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000047ffb0 CR3: 0000000007a22005 CR4: 00000000001606e0
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]
 tipc_nametbl_unsubscribe+0x337/0x990 net/tipc/name_table.c:808
 tipc_sub_unsubscribe+0x6d/0x2e0 net/tipc/subscr.c:164
 tipc_conn_delete_sub+0x324/0x4a0 net/tipc/topsrv.c:245
 tipc_topsrv_kern_unsubscr+0x21d/0x350 net/tipc/topsrv.c:598
 tipc_group_delete+0x2c0/0x3d0 net/tipc/group.c:231
 tipc_sk_leave+0x10b/0x200 net/tipc/socket.c:2800
 tipc_release+0x154/0xff0 net/tipc/socket.c:576
 sock_release+0x8d/0x1e0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 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+0x6ec/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4548b9
RSP: 002b:00007f2fba910c88 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f2fba9116d4 RCX: 00000000004548b9
RDX: 0000000000000058 RSI: 0000000000000001 RDI: 000000000072becc
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000034
R10: 0000000000000110 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000546 R14: 00000000006f9f30 R15: 0000000000000000
Code: 4c 89 e2 48 c7 c7 40 8e e5 86 e8 65 67 a7 fe 0f 0b 48 c7 c7 a0 8e e5 86 e8 57 67 a7 fe 0f 0b 48 c7 c7 00 8f e5 86 e8 49 67 a7 fe <0f> 0b 48 c7 c7 60 8f e5 86 e8 3b 67 a7 fe 0f 0b 48 89 df 48 89 
RIP: __list_del_entry_valid+0xef/0x150 lib/list_debug.c:51 RSP: ffff8801d123ea68
---[ end trace fc3d53c555367b35 ]---