list_add corruption. next->prev should be prev (ffff88805c7bfca8), but was ffff88807b1c15c0. (next=ffff88803711a298).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:23!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7060 Comm: kworker/0:2 Not tainted 4.14.155-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
task: ffff88805c7b4480 task.stack: ffff88805c7b8000
RIP: 0010:__list_add_valid.cold+0xf/0x3c lib/list_debug.c:23
RSP: 0018:ffff88805c7bfc20 EFLAGS: 00010286
RAX: 0000000000000075 RBX: ffff88805c7bfca8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff866d07c0 RDI: ffffed100b8f7f7a
RBP: ffff88805c7bfc38 R08: 0000000000000075 R09: ffff88805c7b4d70
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803711a298
R13: ffff88805c7bfca8 R14: ffff88803711a270 R15: ffff88803711a298
FS:  0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000023b95e0 CR3: 000000009889c000 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+0x1e3/0x880 net/9p/trans_fd.c:216
 p9_poll_mux net/9p/trans_fd.c:632 [inline]
 p9_poll_workfn+0x27e/0x3e0 net/9p/trans_fd.c:1123
 process_one_work+0x863/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 27 ae fe eb d5 4c 89 e7 e8 2a 27 ae fe eb a3 4c 89 f7 e8 20 27 ae fe e9 56 ff ff ff 4c 89 e1 48 c7 c7 80 1f 9d 86 e8 7f af 72 fe <0f> 0b 48 89 f2 4c 89 e1 4c 89 ee 48 c7 c7 c0 20 9d 86 e8 68 af 
RIP: __list_add_valid.cold+0xf/0x3c lib/list_debug.c:23 RSP: ffff88805c7bfc20
---[ end trace 351d93d1de2b4fbc ]---