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From: "changpeng.fang at amd dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug regression/47037] 465.tonto Segmentation Fault in memset with -fcaller-saves (default at -O2 or higher)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47037

Changpeng Fang <changpeng.fang at amd dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|465.tonto Segmentation      |465.tonto Segmentation
                   |Fault in memset             |Fault in memset with
                   |                            |-fcaller-saves (default at
                   |                            |-O2 or higher)

--- Comment #3 from Changpeng Fang <changpeng.fang at amd dot com> 2010-12-23 18:05:02 UTC ---
.LBB633:
        .loc 1 967 0 discriminator 2
        movq    %r13, %rdx
        movq    %rbx, %rsi
        movq    %rsp, %rdi
        call    memcpy
        movl    $128, %edx
        leaq    (%rsp,%r13), %rdi ## <---- bad address
        movl    $32, %esi
        subq    %r13, %rdx
        movq    %rsp, %r12
        call    memset
        jmp     .L707
.LVL646:
        .p2align 4,,10
        .p2align 3


Actually, the segfault is in copying label to symbol at line 967:

character(128) :: symbol
symbol = label(1:lensym)

The memset is to set the remainder of the 128 bytes to ZEROs. The local code
seems
good to me. It might be that the %rsp is not appropriately set. Anyway, it is
not likely to be a fortran bug because it only occurs at -O2 or higher when
-fcaller-saves is turned on,