I found the cause of one of the general protection faults I saw with
my test program and I finally managed to completely restart (a very 
dumb) program for the first time!

My program was failing (GPF) at restart in glibc code. After some 
debugging I found the failures occur on SINGLE_THREAD_P calls 
(eg. glibc/sysdeps/posix/system.c:__libc_system()).

I suspected a problem with nptl and remembered the comments in cr.c 
("for redhat 9.0, NPTL") and in cr.txt ("Support linuxthreads, but not 
NPTL."). I uncommented this code that checkpoints the thread area 
(don't ask me what it is) and, voila, my program restarted!

It doesn't solve everything: I still have issues restarting the 'sleep'
program.

Benjamin

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