Public bug reported:

Binary package hint: udev

Upon recently upgrading from Feisty to Gutsy, my udev seems to have gone
crazy. About halfway through the boot-up process, the splash screen
disappears and I see constant, repeating error messages from udevd.

They're usually to the extent of:
udevd-event[some number]: node_symlink: unlink(/dev/mapper/) failed: Is a 
directory
udevd-event[some number]: node_symlink: symlink(...,/dev/mapper/) failed: 
Device lookup failed

After about a minute, X and GDM startup, but are really slow. Upon
entering my desktop (Gnome if it helps), gkrellm constantly reports my
CPU use at 99%.

If I press alt+ctrl+F1, I see messages about:
[number] device-mapper: table: 254:1: linear: dm-linear: Device lookup failed

If I manually kill the udevd process, my CPU use goes down to almost 0%,
like it should be...

My system is running 32bit Ubuntu (Linux-generic 2.6.22-6), I have a
Pentium 4C 2.4Ghz processor (hyper-threading disabled, although I've
tried it both ways), with a Gig of RAM, SATA hard drives, and an intel
chipset based mother board.

Please let me know anything I can do to help you guys track down this
bug! :)

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

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[gutsy] udev infinitely has errors, keeps CPU at 99%
https://bugs.launchpad.net/bugs/121672
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