Intermittent "HEAP: Trying to free an invalid address" + "Assertion failed: FreeEntry->PreviousSize == CurrentEntry->Size", during "mshtml : htmldoc", on Test VBox

Running Wine Test, Module: mshtml, Test: htmldoc

...

// Build 7854 did not have the following line.

(sdk/lib/rtl/heap.c:2199) HEAP: Trying to free an invalid address 04F69790!

...

// Build 7854 did not have the following line.

(sdk/lib/rtl/heap.c:2199) HEAP: Trying to free an invalid address 03436338!

...

// Build 7854 did not have the following line.

(sdk/lib/rtl/heap.c:2199) HEAP: Trying to free an invalid address 05142808!

...

fixme:(dll/win32/jscript/jscript.c:492) unimplemented state 3

*** Assertion failed: FreeEntry->PreviousSize == CurrentEntry->Size

***   Source File: /srv/buildbot/Build_GCCLin_x86/build/sdk/lib/rtl/heap.c, line 995

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

kdb:>

 o

Execute '.cxr 0022E8E8' to dump context

Unhandled exception

ExceptionCode:    80000003

CS:EIP 1b:7c92db82

DS 23 ES 23 FS 3b GS 0

EAX: 00000000   EBX: 00000000   ECX: 0022e66c

EDX: 00000000   EBP: 0022ebc8   ESI: 0022ebb6   ESP: 0022e8cc

EDI: 7c9736a4   EFLAGS: 00200202

Address:

<ntdll.dll:db82> (C:\ReactOS\System32\ntdll.dll@7c920000)

Frames:

<ntdll.dll:23364> (C:\ReactOS\System32\ntdll.dll@7c920000)

<ntdll.dll:24566> (C:\ReactOS\System32\ntdll.dll@7c920000)

<msvcrt.dll:2731> (C:\ReactOS\system32\msvcrt.dll@7c660000)

<xul.dll:7dc40> (C:\ReactOS\System32\gecko\2.40\wine_gecko\xul.dll@69e40000)

<xul.dll:667b18> (C:\ReactOS\System32\gecko\2.40\wine_gecko\xul.dll@69e40000)

<xul.dll:112d131> (C:\ReactOS\System32\gecko\2.40\wine_gecko\xul.dll@69e40000)

(win32ss/user/ntuser/msgqueue.c:1354) err: Post Msg; Thread or Q is Dead!

(win32ss/user/ntuser/msgqueue.c:1354) err: Post Msg; Thread or Q is Dead!

(win32ss/user/ntuser/msgqueue.c:1354) err: Post Msg; Thread or Q is Dead!

Test htmldoc completed in 63.62 seconds.