Hi

When I've tried  3.19-rc3/4 kernel - after boot I just see 1 CPU core being 
busy 100% with pccard process.

Here is also some kernel WARNING:
(unsure how it's related to busy looping)

------------[ cut here ]------------
WARNING: CPU: 0 PID: 185 at kernel/sched/core.c:7300 __might_sleep+0xbd/0xd0()
do not call blocking ops when !TASK_RUNNING; state=1 set at 
[<ffffffff81518538>] pccardd+0xe8/0x490
Modules linked in: uhci_hcd sr_mod cdrom yenta_socket ehci_pci ehci_hcd 
usbcore usb_common video backlight autofs4
CPU: 0 PID: 185 Comm: pccardd Not tainted 3.19.0-rc4-00143-gbeefabb #2
Hardware name: LENOVO 6464CTO/6464CTO, BIOS 7LETC9WW (2.29 ) 03/18/2011
  ffffffff819e4ac2 ffff8800b845bc58 ffffffff816389cd 0000000000000007
  ffff8800b845bca8 ffff8800b845bc98 ffffffff8105874a ffff880000000000
  ffffffff819e5dab 000000000000026d 0000000000000000 0000000000000080
Call Trace:
  [<ffffffff816389cd>] dump_stack+0x4f/0x7b
  [<ffffffff8105874a>] warn_slowpath_common+0x8a/0xc0
  [<ffffffff810587c6>] warn_slowpath_fmt+0x46/0x50
  [<ffffffff81518538>] ? pccardd+0xe8/0x490
  [<ffffffff81518538>] ? pccardd+0xe8/0x490
  [<ffffffff810840dd>] __might_sleep+0xbd/0xd0
  [<ffffffff8163c4de>] mutex_lock_nested+0x2e/0x440
  [<ffffffff81640ffd>] ? _raw_spin_unlock_irqrestore+0x5d/0x80
  [<ffffffff8108b3db>] ? preempt_count_sub+0xab/0x100
  [<ffffffff815185a0>] pccardd+0x150/0x490
  [<ffffffff81518450>] ? pcmcia_socket_dev_complete+0x40/0x40
  [<ffffffff8107dacf>] kthread+0x11f/0x140
  [<ffffffff8107d9b0>] ? kthread_create_on_node+0x260/0x260
  [<ffffffff81641b6c>] ret_from_fork+0x7c/0xb0
  [<ffffffff8107d9b0>] ? kthread_create_on_node+0x260/0x260
---[ end trace 9a800478929367fe ]---


My HW - Lenovo T61, 4G Ram, C2D, nothing in pcmcia slot is inserted.
Full dmesg and config attached.


Regards

Zdenek