I spent the weekend tracking down crashes a co-worker was experiencing
running mysql4 on a 2.0RC4 machine.  

I discovered gcc was placing local variables beyond the stack pointer
in mf_radix.c::radix_sort_for_str_ptr and filed a gcc bug.  A response
to my bug report explained to me that the gcc code was correct --- the
AMD64 ABI reserves a 128 byte "red-zone" for local variables intended
to be used by leaf functions.  

I checked the 2.0 branch and saw that the thread context switch code
did not account for the red-zone, but there have been recent changes
to -current.

Has a 2.0 pull-up request been made for these changes?  Without them,
threaded applications are likely to fail in all sorts of weird and
wonderful ways.

    --jtc

-- 
J.T. Conklin