list_add corruption. next->prev should be prev (ffff880188b673b0), but was ffff88018a8040c0. (next=ffff880180b52d18).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:25!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5747 Comm: kworker/0:3 Not tainted 4.19.0-rc8+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
RIP: 0010:__list_add_valid.cold.0+0xf/0x25 lib/list_debug.c:23
Code: e8 b3 ee 34 fe e9 68 ff ff ff e8 a9 ee 34 fe eb c9 4c 89 e7 e8 9f ee 34 fe eb 97 48 89 d9 48 c7 c7 00 8f 40 88 e8 62 95 d7 fd <0f> 0b 48 89 f1 48 c7 c7 c0 8f 40 88 48 89 de e8 4e 95 d7 fd 0f 0b
RSP: 0018:ffff880188b67320 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff880180b52d18 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8164d435 RDI: 0000000000000005
RBP: ffff880188b67338 R08: ffff8801c7074480 R09: ffffed003b5c4fe8
R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: ffff880188b673b0
R13: dffffc0000000000 R14: ffff880188b67348 R15: ffff880180b52cb0
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001d32f3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 list_move include/linux/list.h:171 [inline]
 p9_conn_cancel+0x32a/0xcf0 net/9p/trans_fd.c:216
 p9_poll_mux net/9p/trans_fd.c:625 [inline]
 p9_poll_workfn+0x4b5/0x6e0 net/9p/trans_fd.c:1115
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Modules linked in:
---[ end trace a65c04ff4bb88bf7 ]---
RIP: 0010:__list_add_valid.cold.0+0xf/0x25 lib/list_debug.c:23
Code: e8 b3 ee 34 fe e9 68 ff ff ff e8 a9 ee 34 fe eb c9 4c 89 e7 e8 9f ee 34 fe eb 97 48 89 d9 48 c7 c7 00 8f 40 88 e8 62 95 d7 fd <0f> 0b 48 89 f1 48 c7 c7 c0 8f 40 88 48 89 de e8 4e 95 d7 fd 0f 0b
RSP: 0018:ffff880188b67320 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff880180b52d18 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8164d435 RDI: 0000000000000005
RBP: ffff880188b67338 R08: ffff8801c7074480 R09: ffffed003b5c4fe8
R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: ffff880188b673b0
R13: dffffc0000000000 R14: ffff880188b67348 R15: ffff880180b52cb0
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001d32f3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400