I am seeing the exact same on my debian system with the 2.6.38-2-686 kernel.
Aswell as in Fedora 15 Beta that uses also a 2.6.38 kernel.
So my guess its a kernel bug.
Ah and btw. the reason for the high cpu rate in udisks and maybe udev is caused
by a redetection of the stick every few seconds. So a /sbin/udevadm monitor
(executed in a terminal of course) will give you a list of constantly detected
new or changed devices like this :
KERNEL[1303421275.345520] change
/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host7/target7:0:0/7:0:0:1/block/sr1
(block)
KERNEL[1303421275.360795] change
/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host7/target7:0:0/7:0:0:1/block/sr1
(block)
UDEV [1303421275.363611] change
/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host7/target7:0:0/7:0:0:1/block/sr1
(block)
KERNEL[1303421275.377142] change
/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host7/target7:0:0/7:0:0:1/block/sr1
(block)
...
Restarting udev after unplugging the stick again should stop the high cpu
usage.
So executing /etc/init.d/udev restart and the cpu usage is normal again.
** Also affects: udisks (Debian)
Importance: Undecided
Status: New
** Package changed: udisks (Ubuntu) => linux (Ubuntu)
** Also affects: linux (Fedora)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/726814
Title:
udisks-daemon uses a ton of CPU after inserting a SanDisk U3 Cruzer
Micro usb stick
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