Comment 456 for bug 620074

Simplest way to reproduce this bug on most hardware is:

1. create a cryptsetup partition (on LVM or without LVM, both variants are ok). Preferably, all partitions used in test case are must be encrypted;
2. install VirtualBox and try to create preallocated hard disk image, size must be 4GB or more.

That's it! If you try to use another applications at same time, you will see 5-10 sec freezes.

I've reproduced bug on many hardware configurations with 2.6.34 and older kernels, such as:
C2Q Q9650 / 8GB RAM / Seagate HDD / x86_64
i7 920 / 6GB / WD HDD / x86_64
C2D U7600 / 2GB / Samsung SSD / i686
C2D T7200 / 3GB / Seagate HDD / i686

So it's not hardware problems - hardwares age from 4 to 1 years and results are same.
Also, on *BSD and Win there are no problems with that hardware.