Assertion 'InternalInfo' failed at ../../ntoskrnl/fsrtl/filelock.c line 857

Entered debugger on embedded INT3 at 0x0008:0x8091f692.
kdb:> bt
Eip:
<NTOSKRNL.EXE:11f693 (../../lib/rtl/i386/debug_asm.S:35 (_DbgBreakPoint@0))>
Frames:
<NTOSKRNL.EXE:47465 (../../ntoskrnl/fsrtl/filelock.c:857 (FsRtlFastUnlockSingle@32))>
<NTOSKRNL.EXE:47250 (../../ntoskrnl/fsrtl/filelock.c:1194 (FsRtlProcessFileLock@12))>
<fastfat.sys:ac0c> ../../drivers/filesystems/fastfat/misc.c:79 (VfatDispatchRequest)
<fastfat.sys:ad86> ../../drivers/filesystems/fastfat/misc.c:162 (VfatBuildRequest@8)
<NTOSKRNL.EXE:6a78b (../../ntoskrnl/io/iomgr/irp.c:1169 (@IofCallDriver@8))>
<NTOSKRNL.EXE:631d3 (../../ntoskrnl/io/iomgr/iofunc.c:135 (IopPerformSynchronousRequest@28))>
<NTOSKRNL.EXE:6532a (../../ntoskrnl/io/iomgr/iofunc.c:2748 (NtUnlockFile@20))>
<NTOSKRNL.EXE:10b097 (../../ntoskrnl/ke/i386/traphdlr.c:1624 (@KiSystemServiceHandler@8))>
<NTOSKRNL.EXE:108a33 (../../ntoskrnl/ke/i386/trap.s:142 (_KiSystemService))>
<ntdll.dll:afe4> ../../dll/ntdll/dispatch/i386/dispatch.S:251 (_KiIntSystemCall@0)
<kernel32.dll:235b9> ../../dll/win32/kernel32/client/file/lock.c:156 (UnlockFile@20)
<filezilla.exe:5c32f9>
<filezilla.exe:5c3386>
<filezilla.exe:55df16>
<filezilla.exe:569a23>
<filezilla.exe:587755>
<filezilla.exe:594a6e>
<filezilla.exe:5b786c>
<filezilla.exe:5a9fa3>
<filezilla.exe:5aeee7>
<filezilla.exe:c676a>
<filezilla.exe:d32d5>
<filezilla.exe:c0648>
<filezilla.exe:92e26>
<filezilla.exe:48c9f>
<filezilla.exe:5d7dea>
<filezilla.exe:50dda6>
<filezilla.exe:400fa4>
<filezilla.exe:425c6>
<filezilla.exe:5c8dd4>
<filezilla.exe:10a2>
<filezilla.exe:111e>
<kernel32.dll:fa25> ../../dll/win32/kernel32/client/proc.c:467 (BaseProcessStartup@4)
<00000000>
kdb:> cont

Entered debugger on last-chance exception (Exception Code: 0xc0000005) (Page Fault)
Memory at 0x8090E838 could not be read: Page not present.
kdb:> bt
Eip:
<NTOSKRNL.EXE:12d4fe (../../lib/rtl/generictable.c:230 (RtlpFindGenericTableNodeOrParent@12))>
Frames:
<NTOSKRNL.EXE:12d614 (../../lib/rtl/generictable.c:273 (RtlLookupElementGenericTableFull@16))>
<NTOSKRNL.EXE:12d664 (../../lib/rtl/generictable.c:256 (RtlLookupElementGenericTable@8))>
<NTOSKRNL.EXE:4747d (../../ntoskrnl/fsrtl/filelock.c:858 (FsRtlFastUnlockSingle@32))>
<NTOSKRNL.EXE:47250 (../../ntoskrnl/fsrtl/filelock.c:1194 (FsRtlProcessFileLock@12))>
<fastfat.sys:ac0c> ../../drivers/filesystems/fastfat/misc.c:79 (VfatDispatchRequest)
<fastfat.sys:ad86> ../../drivers/filesystems/fastfat/misc.c:162 (VfatBuildRequest@8)
<NTOSKRNL.EXE:6a78b (../../ntoskrnl/io/iomgr/irp.c:1169 (@IofCallDriver@8))>
<NTOSKRNL.EXE:631d3 (../../ntoskrnl/io/iomgr/iofunc.c:135 (IopPerformSynchronousRequest@28))>
<NTOSKRNL.EXE:6532a (../../ntoskrnl/io/iomgr/iofunc.c:2748 (NtUnlockFile@20))>
<NTOSKRNL.EXE:10b097 (../../ntoskrnl/ke/i386/traphdlr.c:1624 (@KiSystemServiceHandler@8))>
<NTOSKRNL.EXE:108a33 (../../ntoskrnl/ke/i386/trap.s:142 (_KiSystemService))>
<ntdll.dll:afe4> ../../dll/ntdll/dispatch/i386/dispatch.S:251 (_KiIntSystemCall@0)
<kernel32.dll:235b9> ../../dll/win32/kernel32/client/file/lock.c:156 (UnlockFile@20)
<filezilla.exe:5c32f9>
<filezilla.exe:5c3386>
<filezilla.exe:55df16>
<filezilla.exe:569a23>
<filezilla.exe:587755>
<filezilla.exe:594a6e>
<filezilla.exe:5b786c>
<filezilla.exe:5a9fa3>
<filezilla.exe:5aeee7>
<filezilla.exe:c676a>
<filezilla.exe:d32d5>
<filezilla.exe:c0648>
<filezilla.exe:92e26>
<filezilla.exe:48c9f>
<filezilla.exe:5d7dea>
<filezilla.exe:50dda6>
<filezilla.exe:400fa4>
<filezilla.exe:425c6>
<filezilla.exe:5c8dd4>
<filezilla.exe:10a2>
<filezilla.exe:111e>
<kernel32.dll:fa25> ../../dll/win32/kernel32/client/proc.c:467 (BaseProcessStartup@4)
<00000000>
kdb:>