list_del corruption, ffff88809f28cdb0->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 21440 Comm: kworker/1:0 Not tainted 4.20.0-rc7-next-20181224 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_read_work
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4f lib/list_debug.c:45
Code: e8 d5 5d d6 fd 0f 0b 4c 89 f6 48 c7 c7 e0 a0 81 88 e8 c4 5d d6 fd 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 a0 81 88 e8 b0 5d d6 fd <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 a0 81 88 e8 9c 5d d6 fd 0f 0b
RSP: 0018:ffff888056fb78b8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff88809f28cd00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8167d966 RDI: ffffed100adf6f09
RBP: ffff888056fb78d0 R08: 000000000000004e R09: ffffed1015ce5021
R10: ffffed1015ce5020 R11: ffff8880ae728107 R12: dead000000000200
R13: dead000000000100 R14: ffff88809f28cdb0 R15: 0000000000000015
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb99ec4bdb8 CR3: 000000009f791000 CR4: 00000000001406e0
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 include/linux/list.h:125 [inline]
 p9_read_work+0xa7f/0x1140 net/9p/trans_fd.c:378
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 61d70736f2000770 ]---
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4f lib/list_debug.c:45
Code: e8 d5 5d d6 fd 0f 0b 4c 89 f6 48 c7 c7 e0 a0 81 88 e8 c4 5d d6 fd 0f 0b 4c 89 ea 4c 89 f6 48 c7 c7 20 a0 81 88 e8 b0 5d d6 fd <0f> 0b 4c 89 e2 4c 89 f6 48 c7 c7 80 a0 81 88 e8 9c 5d d6 fd 0f 0b
RSP: 0018:ffff888056fb78b8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff88809f28cd00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8167d966 RDI: ffffed100adf6f09
RBP: ffff888056fb78d0 R08: 000000000000004e R09: ffffed1015ce5021
R10: ffffed1015ce5020 R11: ffff8880ae728107 R12: dead000000000200
R13: dead000000000100 R14: ffff88809f28cdb0 R15: 0000000000000015
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb99ec4bdb8 CR3: 000000009f791000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400