Got this after stopping a RAID-1 array:
[ 626.694737] md: md3 still in use.
[ 626.694946] md: delaying resync of md3 until md2 has finished (they
share one or more physical units)
[ 628.256210] md3: detected capacity change from 3888444473344 to 0
[ 628.256372] md: md3 stopped.
[ 628.256383] md: unbind<sdb4>
[ 628.274852] md: export_rdev(sdb4)
[ 628.274909] md: unbind<sda4>
[ 628.282856] md: export_rdev(sda4)
[ 628.283246] ------------[ cut here ]------------
[ 628.283258] WARNING: CPU: 3 PID: 249 at
/home/kernel/COD/linux/mm/backing-dev.c:372 bdi_unregister+0x36/0x40()
[ 628.283261] Modules linked in: intel_rapl iosf_mbi
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
lrw gf128mul glue_helper ablk_helper eeepc_wmi asus_wmi ppdev
sparse_keymap parport_pc cryptd video shpchp 8250_fintek lpc_ich lp
tpm_infineon wmi mac_hid parport serio_raw btrfs pata_acpi raid10
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor
raid6_pq raid1 ahci r8169 libahci raid0 mii pata_via multipath linear
[ 628.283320] CPU: 3 PID: 249 Comm: kworker/3:1 Not tainted
4.0.5-040005-generic #201506061639
[ 628.283322] Hardware name: System manufacturer System Product
Name/P8H67-M PRO, BIOS 3904 04/27/2013
[ 628.283328] Workqueue: md_misc mddev_delayed_delete
[ 628.283341] 0000000000000174 ffff88040867bca8 ffffffff817e4a5d
0000000000000007
[ 628.283347] 0000000000000000 ffff88040867bce8 ffffffff81079227
ffffffff81adc895
[ 628.283352] ffff880409197c00 0000000000000000 0000000000000000
ffff88041f2da900
[ 628.283365] Call Trace:
[ 628.283374] [<ffffffff817e4a5d>] dump_stack+0x45/0x57
[ 628.283381] [<ffffffff81079227>] warn_slowpath_common+0x97/0xe0
[ 628.283386] [<ffffffff8107928a>] warn_slowpath_null+0x1a/0x20
[ 628.283390] [<ffffffff811a3f16>] bdi_unregister+0x36/0x40
[ 628.283397] [<ffffffff813955f8>] del_gendisk+0x108/0x260
[ 628.283402] [<ffffffff81648eec>] md_free+0x4c/0x70
[ 628.283408] [<ffffffff813b6b62>] kobject_cleanup+0x82/0x1c0
[ 628.283413] [<ffffffff813b69f0>] kobject_put+0x30/0x70
[ 628.283417] [<ffffffff81649c44>] mddev_delayed_delete+0x34/0x40
[ 628.283422] [<ffffffff81092204>] process_one_work+0x144/0x490
[ 628.283426] [<ffffffff81092c6e>] worker_thread+0x11e/0x450
[ 628.283431] [<ffffffff81092b50>] ? create_worker+0x1f0/0x1f0
[ 628.283436] [<ffffffff81098999>] kthread+0xc9/0xe0
[ 628.283442] [<ffffffff810988d0>] ? flush_kthread_worker+0x90/0x90
[ 628.283448] [<ffffffff817f1118>] ret_from_fork+0x58/0x90
[ 628.283453] [<ffffffff810988d0>] ? flush_kthread_worker+0x90/0x90
[ 628.283457] ---[ end trace 2c187f15cc11aca4 ]---
--
Tomasz Chmielewski
http://wpkg.org
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