list_del corruption. prev->next should be ffff8881bf303db0, but was ffff8881b7ca4b70
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6285 Comm: kworker/1:3 Not tainted 4.20.0-rc4+ #335
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51
Code: d6 60 88 e8 b2 fd d1 fd 0f 0b 48 89 de 48 c7 c7 40 d8 60 88 e8 a1 fd d1 fd 0f 0b 48 89 de 48 c7 c7 e0 d7 60 88 e8 90 fd d1 fd <0f> 0b 48 89 d9 48 c7 c7 a0 d8 60 88 e8 7f fd d1 fd 0f 0b 48 89 f1
RSP: 0018:ffff8881baa1f440 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8881bf303db0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eae5 RDI: 0000000000000005
cgroup: fork rejected by pids controller in /syz2
RBP: ffff8881baa1f458 R08: ffff8881bb3166c0 R09: ffffed103b5e5020
R10: ffffed103b5e5020 R11: ffff8881daf28107 R12: ffff8881d8ebcff0
R13: ffff8881b905eff0 R14: ffff8881baa1f560 R15: 1ffff11037543e94
FS:  0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002455978 CR3: 00000001c3192000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
cgroup: fork rejected by pids controller in /syz5
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 neigh_mark_dead+0x13b/0x410 net/core/neighbour.c:125
cgroup: fork rejected by pids controller in /syz4
 neigh_periodic_work+0x89a/0xc30 net/core/neighbour.c:905
 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 2f3bad452f053090 ]---
RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51
Code: d6 60 88 e8 b2 fd d1 fd 0f 0b 48 89 de 48 c7 c7 40 d8 60 88 e8 a1 fd d1 fd 0f 0b 48 89 de 48 c7 c7 e0 d7 60 88 e8 90 fd d1 fd <0f> 0b 48 89 d9 48 c7 c7 a0 d8 60 88 e8 7f fd d1 fd 0f 0b 48 89 f1
RSP: 0018:ffff8881baa1f440 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8881bf303db0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eae5 RDI: 0000000000000005
RBP: ffff8881baa1f458 R08: ffff8881bb3166c0 R09: ffffed103b5e5020
R10: ffffed103b5e5020 R11: ffff8881daf28107 R12: ffff8881d8ebcff0
R13: ffff8881b905eff0 R14: ffff8881baa1f560 R15: 1ffff11037543e94
cgroup: fork rejected by pids controller in /syz1
FS:  0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002455978 CR3: 000000000946a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400