[Issue 6376] core.thread.thread_scanAll doesn't scan the stack due to ASLR on Mac OS X 10.7

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6376


kennytm at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Throwing exception or       |core.thread.thread_scanAll
                   |assertion failure causes    |doesn't scan the stack due
                   |segfault or memory error    |to ASLR on Mac OS X 10.7
                   |due to ASLR on Mac OS X     |
                   |10.7                        |


--- Comment #8 from kennytm at gmail.com 2011-07-26 03:14:47 PDT ---
The classinfo corruption is because the Throwable object is finalized
prematurely. This is because the object is placed *on stack*, and the stack is
not marked by the GC (!) using core.thread.thread_scanAll. Updated title to
reflect the deeper cause.



Test case:
---------------
import core.stdc.stdio;
import core.thread;
void main() {
    void scan(void* from, void* to) {
        printf("%p -> %p\n", from, to);
    }
    size_t stackTop;
    thread_scanAll(&scan, &stackTop);
}
---------------

With ASLR:
   0x201fc0 -> 0x201fe4

Without ASLR:
   0xbffff924 -> 0xc0000000
   0x201fc0 -> 0x201fe4

Note that the stack is > 0xc000_0000 when ASLR is enabled.

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