[dm-crypt] writing greater than 1GB of data through the mapper to a file hangs kernel 3.2.x

.. ink .. mhogomchungu at gmail.com
Thu Jul 5 11:19:10 CEST 2012

I am using pclinuxos and "uname -a" gives:
Linux mtz 3.2.18-pclos2.bfs #1 SMP PREEMPT Thu May 24 04:44:50 CEST
2012 i686 i686 i386 GNU/Linux

Using this kernel version:

i created a 2GB file using dd, then i opened a plain mapper on the
file and then attempted to write 1GB of data through the mapper using
dd and the system lock up. I tried it 3 times and it lock up 3 times.

writing 100MB  or smaller amount of data does not hang the system.It
seem the lock up occurs when a certain number of data is passed.

is this problem known?

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