WARNING: at fs/block_dev.c:5 when removing LV on removed device

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I was trying to remove a LVM logical volume on a hotplugged device
that had been removed, to also remove its VG, which resulted in:

[1728002.718174] ------------[ cut here ]------------
[1728002.718179] WARNING: CPU: 10 PID: 15454 at fs/block_dev.c:57
__blkdev_put+0xc1/0x220()
[1728002.718180] Modules linked in: dm_crypt mce_inject vfat fat bnep
bluetooth rfkill xt_CHECKSUM iptable_mangle ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack tun bridge stp llc
ebtable_filter ebtables ip6table_filter ip6_tables fuse
snd_hda_codec_realtek x86_pkg_temp_thermal coretemp
snd_hda_codec_generic snd_hda_codec_hdmi kvm_intel snd_hda_intel kvm
snd_hda_controller iTCO_wdt xfs snd_hda_codec iTCO_vendor_support
snd_hwdep snd_seq mxm_wmi snd_seq_device crct10dif_pclmul snd_pcm
crc32_pclmul crc32c_intel snd_timer sb_edac snd libcrc32c mei_me
ghash_clmulni_intel lpc_ich edac_core serio_raw i2c_i801 soundcore mei
shpchp mfd_core nuvoton_cir rc_core wmi binfmt_misc uas usb_storage
radeon i2c_algo_bit drm_kms_helper ttm
[1728002.718209]  e1000e drm firewire_ohci firewire_core ptp pps_core
crc_itu_t
[1728002.718213] CPU: 10 PID: 15454 Comm: umount Not tainted
4.0.4-301.fc22.x86_64 #1
[1728002.718214] Hardware name:                  /DX79SI, BIOS
SIX7910D.86A.1827.2013.0701.1715 07/01/2013
[1728002.718215]  0000000000000000 000000007fcff292 ffff88008f4abd98
ffffffff81782644
[1728002.718217]  0000000000000000 0000000000000000 ffff88008f4abdd8
ffffffff8109c66a
[1728002.718218]  0000000000000000 ffff8800c67584b8 ffff8800c6758340
ffff8800c6758430
[1728002.718220] Call Trace:
[1728002.718224]  [<ffffffff81782644>] dump_stack+0x45/0x57
[1728002.718226]  [<ffffffff8109c66a>] warn_slowpath_common+0x8a/0xc0
[1728002.718228]  [<ffffffff8109c79a>] warn_slowpath_null+0x1a/0x20
[1728002.718230]  [<ffffffff81258171>] __blkdev_put+0xc1/0x220
[1728002.718231]  [<ffffffff81258760>] blkdev_put+0x50/0x130
[1728002.718234]  [<ffffffff8121f9e1>] kill_block_super+0x41/0x80
[1728002.718236]  [<ffffffff8121fd39>] deactivate_locked_super+0x49/0x80
[1728002.718238]  [<ffffffff812201ac>] deactivate_super+0x6c/0x80
[1728002.718241]  [<ffffffff8123ebb3>] cleanup_mnt+0x43/0xa0
[1728002.718245]  [<ffffffff81140bd6>] ?
__audit_syscall_exit+0x1f6/0x290
[1728002.718246]  [<ffffffff8123ec62>] __cleanup_mnt+0x12/0x20
[1728002.718249]  [<ffffffff810b9a24>] task_work_run+0xc4/0xe0
[1728002.718252]  [<ffffffff81013d0d>] do_notify_resume+0x9d/0xa0
[1728002.718255]  [<ffffffff81788ee3>] int_signal+0x12/0x17
[1728002.718256] ---[ end trace 4975e97dd7331e63 ]---

Also the VG removal did not work of course.

-Andi

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