This thread is the same as what you're asking about: http://grsecurity.net/pipermail/grsecurity/2005-October/000581.html It says to run 'paxctl -spm' on the program and libraries, but it sounds like you tried that.
CFLAGS="-nopie -fno-pic -norelro -nonow -fno-stack-protector -D_FORTIFY_SOURCE=0" should disable the compiler flags. There's a chance -fstack-protector-all is the cause of the crashes (like with Python and -O3), so you might want to leave that in. Even with these flags, you will probably still need to use 'paxctl -spm'. Adding '-g3 -ggdb' might also help. If that doesn't work, rebuild gdb itself with the above flags. robert
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