linux-kernel - incomplete RAID0 array causing bdi_unregister WARN

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Date:	Thu, 21 May 2015 11:47:49 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	NeilBrown <neilb@...e.de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: incomplete RAID0 array causing bdi_unregister WARN_ON.

One of the disks in my 4 disk RAID0 stripe died.
It's a hardware problem, but this spew seems unnecessary..

	Dave

WARNING: CPU: 0 PID: 39 at mm/backing-dev.c:372 bdi_unregister+0x3a/0x50()
CPU: 0 PID: 39 Comm: kworker/0:1 Not tainted 4.1.0-rc4-gelk-debug+ #1
Workqueue: md_misc mddev_delayed_delete [md_mod]
 0000000000000009 ffff8800baf9fbf8 ffffffffa6768350 0000000000000000
 0000000000000000 ffff8800baf9fc38 ffffffffa607eaaa ffff8800baf9fc18
 ffff8800b57cdcd0 0000000000000000 0000000000000000 00000000ffffffff
Call Trace:
 [<ffffffffa6768350>] dump_stack+0x4f/0x7b
 [<ffffffffa607eaaa>] warn_slowpath_common+0x8a/0xc0
 [<ffffffffa607eb9a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa61c31fa>] bdi_unregister+0x3a/0x50
 [<ffffffffa636981f>] del_gendisk+0x11f/0x250
 [<ffffffffc00b8583>] md_free+0x43/0x60 [md_mod]
 [<ffffffffa638496a>] kobject_release+0x7a/0x1c0
 [<ffffffffa6384815>] kobject_put+0x35/0x70
 [<ffffffffc00b5ab4>] mddev_delayed_delete+0x34/0x40 [md_mod]
 [<ffffffffa609d8e1>] process_one_work+0x1f1/0x820
 [<ffffffffa609d850>] ? process_one_work+0x160/0x820
 [<ffffffffa609e00b>] ? worker_thread+0xfb/0x4b0
 [<ffffffffa609df7b>] worker_thread+0x6b/0x4b0
 [<ffffffffa609df10>] ? process_one_work+0x820/0x820
 [<ffffffffa609df10>] ? process_one_work+0x820/0x820
 [<ffffffffa60a431f>] kthread+0x11f/0x140
 [<ffffffffa60a4200>] ? kthread_create_on_node+0x250/0x250
 [<ffffffffa6772292>] ret_from_fork+0x42/0x70
 [<ffffffffa60a4200>] ? kthread_create_on_node+0x250/0x250
---[ end trace 424fb17cf914b7dc ]---


370 void bdi_unregister(struct backing_dev_info *bdi)
371 {
372         if (WARN_ON_ONCE(!bdi->dev))
373                 return;
374 

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