Comment 3 for bug 1403459

(In reply to Takashi Iwai from comment #1)
> Could you check whether the issue is reproduced on 3.17 and 3.18 kernels
> available at OBS Kernel:stable and Kernel:HEAD repos?

Same result with linux 3.17 from OBS Kernel:stable:

# uname -a
Linux opensuse 3.17.4-4.g8622a2e-default #1 SMP Sat Dec 6 20:43:41 UTC 2014 (8622a2e) x86_64 x86_64 x86_64 GNU/Linux
# dmesg
[ 117.297802] CPU1 has been hot-added
[ 117.298543] SMP alternatives: switching to SMP code
[ 117.306886] x86: Booting SMP configuration:
[ 117.306922] smpboot: Booting Node 0 Processor 1 APIC 0x1
[ 0.008000] kvm-clock: cpu 1, msr 2:403de041, secondary cpu clock
[ 117.320007] TSC synchronization [CPU#0 -> CPU#1]:
[ 117.320007] Measured 407089711478 cycles TSC warp between CPUs, turning off TSC clock.
[ 117.320007] tsc: Marking TSC unstable due to check_tsc_sync_source failed
[ 117.338582] KVM setup async PF for cpu 1
[ 117.338626] kvm-stealtime: cpu 1, msr 24004d240
[ 117.338727] kobject '(null)' (ffff88024005a558): tried to add an uninitialized object, something is seriously wrong.
[ 117.338728] CPU: 0 PID: 841 Comm: systemd-udevd Not tainted 3.17.4-4.g8622a2e-default #1
[ 117.338729] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_171129-lamiak 04/01/2014
[ 117.338730] ffff8800bbaf3d98 ffffffff815dc842 ffff88024005a558 ffffffff813181c3
[ 117.338731] ffffffff00000020 ffff8800bbaf3da8 ffff8800bbaf3d50 0000000133a94f28
[ 117.338732] 000000000000b0a0 0000000001e779d0 0000000000000001 ffff880233a94a18
[ 117.338732] Call Trace:
[ 117.338740] [<ffffffff81005246>] dump_trace+0x86/0x330
[ 117.338742] [<ffffffff81005584>] show_stack_log_lvl+0x94/0x170
[ 117.338744] [<ffffffff81006be1>] show_stack+0x21/0x50
[ 117.338746] [<ffffffff815dc842>] dump_stack+0x41/0x51
[ 117.338749] [<ffffffff813181c3>] kobject_add+0xa3/0xb0
[ 117.338753] [<ffffffff812f74a1>] blk_mq_register_hctx+0x91/0xb0
[ 117.338755] [<ffffffff812f7d5e>] blk_mq_sysfs_register+0x3e/0x50
[ 117.338756] [<ffffffff812f5962>] blk_mq_queue_reinit_notify+0x72/0xb0
[ 117.338759] [<ffffffff8107985c>] notifier_call_chain+0x4c/0x70
[ 117.338761] [<ffffffff8105d6cf>] cpu_notify+0x1f/0x40
[ 117.338763] [<ffffffff8105d8b7>] _cpu_up+0x157/0x170
[ 117.338765] [<ffffffff8105d949>] cpu_up+0x79/0xa0
[ 117.338768] [<ffffffff815d1625>] cpu_subsys_online+0x35/0x80
[ 117.338776] [<ffffffff814150ed>] device_online+0x5d/0xa0
[ 117.338779] [<ffffffff814151a5>] online_store+0x75/0x80
[ 117.338782] [<ffffffff81227c4a>] kernfs_fop_write+0xda/0x150
[ 117.338785] [<ffffffff811b7d62>] vfs_write+0xb2/0x1f0
[ 117.338787] [<ffffffff811b88a2>] SyS_write+0x42/0xa0
[ 117.338788] [<ffffffff815e2f6d>] system_call_fastpath+0x1a/0x1f
[ 117.338800] [<00007f5728fbd4e0>] 0x7f5728fbd4e0
[ 117.338826] microcode: CPU1 sig=0x306c1, pf=0x1, revision=0x1
[ 117.393791] Will online and init hotplugged CPU: 1