Assertion error in ntoskrnl/io/iomgr/file.c after exception in Apache web server

(ntoskrnl/io/iomgr/file.c:1949) We need to unlock this file!

*** Assertion failed: FALSE

***   Source File: /srv/buildbot/Build_GCCLin_x86/build/ntoskrnl/io/iomgr/file.c, line 1950

Break repeatedly, break Once, Ignore, terminate Process or terminate Thread (boipt)?  

kdb:> b

Command 'b' is unknown.

kdb:> bt

Eip:

<NTOSKRNL.EXE:13c18f (:0 (DbgBreakPoint))>

Frames:

<NTOSKRNL.EXE:5d803 (ntoskrnl/io/iomgr/file.c:1950 (IopCloseFile))>

<NTOSKRNL.EXE:e7076 (ntoskrnl/ob/obhandle.c:634 (ObpDecrementHandleCount))>

<NTOSKRNL.EXE:e72c2 (ntoskrnl/ob/obhandle.c:761 (ObpCloseHandleTableEntry))>

<NTOSKRNL.EXE:e7313 (ntoskrnl/ob/obhandle.c:1927 (ObpCloseHandleCallback))>

<NTOSKRNL.EXE:30ca3 (ntoskrnl/ex/handle.c:1211 (ExSweepHandleTable))>

<NTOSKRNL.EXE:e8ff1 (ntoskrnl/ob/obhandle.c:2182 (ObKillProcess))>

<NTOSKRNL.EXE:fc00e (ntoskrnl/ps/kill.c:837 (PspExitThread))>

<NTOSKRNL.EXE:fc27c (ntoskrnl/ps/kill.c:1017 (PspTerminateThreadByPointer))>

<NTOSKRNL.EXE:fcb81 (ntoskrnl/ps/kill.c:1249 (NtTerminateProcess))>

<NTOSKRNL.EXE:1212f4 (ntoskrnl/include/internal/i386/ke.h:706 (KiSystemServiceHandler))>

<NTOSKRNL.EXE:3da9 (:0 (KiFastCallEntry))>

<ntdll.dll:c81d>

<MSVCR90.dll:6c8c9>

<MSVCR90.dll:6ae59>

<libapr-1.dll:1e66>

<ccccc378>

Couldn't access memory at 0x5B73A8BC!