linuxolator: tls_test results amd64

[Divacky Roman]

the tls_test program is at

www.stud.fit.vutbr.cz/~xdivac02/tls_test.c

On Sun, Jan 21, 2007 at 12:41:02PM -0600, Scot Hetzel wrote:
> Divacky Roman asked me to update my sources to the latest P4 patches
> and run the tls_test program.  Below are the results:
> 
> hp010 / # ./tls_test
> 
> doing 1st set_thread_area():
> ====> got GDT selector: 0x0 --- TEST PASSED.
> 
> reading first byte of [0x00000000] TLS:
> ====> 123 --- TEST PASSED.
> 
> doing 2nd set_thread_area():
> ====> got GDT selector: 0x4 --- TEST PASSED.
> context-switching once ...
> 
> reading first byte of 4K [0x0804aca0] TLS:
> Segmentation fault (core dumped)

this means that we are able to set up the TLS for the very first
time but not any other time.

can someone explain this?