About x86_64-gsbase

[Wenji Huang]

Hi,   The bug x86_64-gsbase (http://sourceware.org/systemtap/wiki/utrace/tests) is to read gs_base register through PTRACE_PEEKUSR. It fails in 2.6.24 upstream kernel and utrace patched kernel. Seem that    ptrace -> arch_ptrace -> getreg Or    ptrace -> arch_ptrace -> ptrace_peekusr -> ptrace_layout_access -> getreg return incorrect value. But I applied the patch in the thread (http://lkml.org/lkml/2007/11/21/82) which had been merged into mainline since 2.6.24-git9 and found the problem gone away. The re-write utrace based on that code should also get rid of the bug. Thanks, Wenji