I wrote a "hello world" program, and compiled it using DMD1 on FreeBSD(amd64) 8.2R. When I run it, the program exits with segmentation fault.

% ./hello
[5]    195 segmentation fault  ./hello
Sep 18 13:02:56 maroon kernel: pid 195 (hello), uid 10103: exited on signal 11

I run the program with gdb.

% gdb ./hello
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
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This GDB was configured as "amd64-marcel-freebsd"...
(gdb) r
Starting program: /home/sohgo/work/d/d-freebsd-amd64-current/phobos1/hello
[New LWP 100186]
[New Thread 800c041c0 (LWP 100186)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 800c041c0 (LWP 100186)]
0x000000000041c427 in _D3gcx3Gcx4markMFPvPvZv (this=0x800c0e100, ptop=0x533c48, pbot=0x422c42) at gcx.d:1781
1781                byte *p = cast(byte *)(*p1);
(gdb) bt
#0  0x000000000041c427 in _D3gcx3Gcx4markMFPvPvZv (this=0x800c0e100, ptop=0x533c48, pbot=0x422c42) at gcx.d:1781
#1  0x000000000041c95f in _D3gcx3Gcx11fullcollectMFPvZm (this=0x800c0e100, stackTop=0x0) at gcx.d:2050
#2  0x000000000041c623 in _D3gcx3Gcx16fullcollectshellMFZm (this=0x800c0e100) at gcx.d:1885
#3  0x0000000000419fbf in _D3gcx2GC12mallocNoSyncMFmZPv (this=0x800c0d040, size=112) at gcx.d:374
#4  0x0000000000419e31 in _D3gcx2GC6mallocMFmZPv (this=0x800c0d040, size=112) at gcx.d:318
#5  0x0000000000417480 in _d_newclass (ci=0x52fd58) at gc.d:190
#6  0x0000000000422248 in _D3std6thread6Thread11thread_initFZv () at std/thread.d:1094
#7  0x0000000000417401 in gc_init () at gc.d:167
#8  0x000000000041edcc in _d_run_main (argc=1, argv=0x7fffffffe7a0, p=0x402370) at internal/dmain2.d:109
#9  0x000000000041ed5f in main (argc=1, argv=0x7fffffffe7a0) at internal/dmain2.d:59
(gdb) p p1
$1 = (void **) 0x428ffa
(gdb) p *p1
Error accessing memory address 0x428ffa: Bad address.
(gdb)

Therefore, unittest for phobos1 exit with segmentation fault too.
Any unittest does not pass.