BSOD 0x50 when opening explorer with UDFS DVD loaded

*** Fatal System Error: 0x00000050

                       (0xFFBDF000,0x00000000,0xF620E377,0x00000000)Driver at fault:

***      udfs.sys - Address F620E377 base at F620D000, DateStamp 638bf560

.Entered debugger on embedded INT3 at 0x0008:0x8059D6C8.

kdb:> b

Command 'b' is unknown.

kdb:> bt

Eip:

<ntoskrnl.exe:19d6c8 (sdk/lib/rtl/i386/debug_asm.S:56 (RtlpBreakWithStatusInstruction))>

Frames:

<ntoskrnl.exe:94d31 (ntoskrnl/ke/bug.c:1066 (KeBugCheckWithTf))>

<ntoskrnl.exe:9529b (ntoskrnl/ke/bug.c:1413 (KeBugCheckEx))>

<ntoskrnl.exe:c50ea (ntoskrnl/mm/ARM3/pagfault.c:2053 (MmArmAccessFault))>

<ntoskrnl.exe:fd7a8 (ntoskrnl/mm/mmfault.c:251 (MmAccessFault))>

<ntoskrnl.exe:15f670 (ntoskrnl/ke/i386/traphdlr.c:1369 (KiTrap0EHandler))>

<ntoskrnl.exe:36ae (:0 (KiTrap0E))>

<udfs.sys:1372 (drivers/filesystems/udfs/udf_info/alloc.cpp:1092 (UDFGetPartFreeSpace))>

<udfs.sys:13db (drivers/filesystems/udfs/udf_info/alloc.cpp:1123 (UDFGetFreeSpace))>

<udfs.sys:32dd7 (drivers/filesystems/udfs/fscntrl.cpp:725 (UDFMountVolume))>

<udfs.sys:34f67 (drivers/filesystems/udfs/fscntrl.cpp:127 (UDFCommonFSControl))>

<udfs.sys:35143 (drivers/filesystems/udfs/fscntrl.cpp:62 (UDFFSControl))>

<ntoskrnl.exe:772e5 (ntoskrnl/io/iomgr/irp.c:1286 (IofCallDriver))>

<ntoskrnl.exe:7cdd4 (ntoskrnl/io/iomgr/volume.c:622 (IopMountVolume))>

<ntoskrnl.exe:7d506 (ntoskrnl/io/iomgr/volume.c:100 (IopCheckVpbMounted))>

<ntoskrnl.exe:685b9 (ntoskrnl/io/iomgr/file.c:634 (IopParseDevice))>

<ntoskrnl.exe:11df5f (ntoskrnl/ob/obname.c:1001 (ObpLookupObjectName))>

<ntoskrnl.exe:116019 (ntoskrnl/ob/obhandle.c:2612 (ObOpenObjectByName))>

<ntoskrnl.exe:69a98 (sdk/include/crt/mingw32/intrin_x86.h:724 (IopCreateFile))>

<ntoskrnl.exe:6a70c (ntoskrnl/io/iomgr/file.c:3024 (IoCreateFile))>

<ntoskrnl.exe:6bb4a (ntoskrnl/io/iomgr/file.c:3959 (NtOpenFile))>

<ntoskrnl.exe:3fe5 (:0 (KiSystemCallTrampoline))>

<ntoskrnl.exe:16069f (ntoskrnl/ke/i386/traphdlr.c:1840 (KiSystemServiceHandler))>

<ntoskrnl.exe:3e2f (:0 (KiFastCallEntry))>

* <ntdll.dll:f485 (dll/ntdll/dispatch/i386/dispatch.S:255 (KiIntSystemCall))>

* <shell32.dll:5cdc4 (dll/win32/shell32/folders/CDrivesFolder.cpp:986 (CDrivesFolder::GetDisplayNameOf))>

* <browseui.dll:1a065 (dll/win32/browseui/addresseditbox.cpp:541 (CAddressEditBox::AddComboBoxItem))>

* <browseui.dll:1a438 (dll/win32/browseui/addresseditbox.cpp:604 (CAddressEditBox::FillOneLevel))>

* <browseui.dll:1a6e0 (dll/win32/browseui/addresseditbox.cpp:521 (CAddressEditBox::PopulateComboBox))>

* <browseui.dll:1a7f1 (dll/win32/browseui/addresseditbox.cpp:400 (CAddressEditBox::Invoke))>

* <browseui.dll:3b35a (dll/win32/browseui/shellbrowser.cpp:1540 (CShellBrowser::FireEvent))>

* <browseui.dll:3b3e3 (dll/win32/browseui/shellbrowser.cpp:1563 (CShellBrowser::FireNavigateComplete))>

* <browseui.dll:3c052 (dll/win32/browseui/shellbrowser.cpp:1029 (CShellBrowser::BrowseToPath))>

* <browseui.dll:3c58d (dll/win32/browseui/shellbrowser.cpp:814 (CShellBrowser::BrowseToPIDL))>

* <browseui.dll:3c7ca (dll/win32/browseui/shellbrowser.cpp:2246 (CShellBrowser::BrowseObject))>

* <browseui.dll:2c387 (dll/win32/browseui/desktopipc.cpp:373 (BrowserThreadProc))>

* <kernel32.dll:1c97b (dll/win32/kernel32/client/thread.c:71 (BaseThreadStartup))>