------------[ cut here ]------------
WARNING: CPU: 1 PID: 25 at lib/list_debug.c:59 __list_del_entry+0x148/0x1c0 lib/list_debug.c:57
list_del corruption. prev->next should be ffff8801a1740028, but was ffff8801d941fb88
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 25 Comm: kworker/1:1 Not tainted 4.9.111-g03c70fe #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
 ffff8801d941f908 ffffffff81eb2729 ffffffff83c48980 00000000ffffffff
 0000000000000000 0000000000000001 000000000000003b ffff8801d941f9c8
 ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836
Call Trace:
 [<ffffffff81eb2729>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb2729>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff814219f5>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81421ce1>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff81136672>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81f1a608>] __list_del_entry+0x148/0x1c0 lib/list_debug.c:57
 [<ffffffff81f1a68d>] list_del+0xd/0x70 lib/list_debug.c:77
 [<ffffffff839c1b11>] p9_conn_cancel+0x2e1/0x4c0 net/9p/trans_fd.c:220
 [<ffffffff839c2242>] p9_poll_mux net/9p/trans_fd.c:630 [inline]
 [<ffffffff839c2242>] p9_poll_workfn+0x222/0x330 net/9p/trans_fd.c:1097
 [<ffffffff8118d131>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df26>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d05d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f8e9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..