Bug ID: JDK-6550813 Crash because of FPU control word being modified by native code (win32)

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Other	JDK 6	JDK 7	Other
5.0-pool,hs11Resolved	6u10Fixed	7Fixed	hs11Fixed

Since JDK 6u1 released to the public, we have seen a marked increase in JVM crashes
reported by Azureus users that seem to be connected to the 6u1 version and a product 
called Alcohol 120. Customers have been recommended to downgrade their Java or 
uninstall Alcohol. 

Attached a selection of crashes - note they all are of type

EXCEPTION_FLT_DIVIDE_BY_ZERO or EXCEPTION_FLT_STACK_CHECK

EVALUATION This bug is not a regression. Alcohol 120% is a CD/DVD backup program which can create <file>.mds archives. This is not a legitimate BitTorrent file type. Trying to share .mds files using java-based Azureus, may expose the native code problem in Alcohol 120%. So, it is not that Java/Azureus stopped working (regression) but that .mds files started to be shared. So, I'm going to remove the 'REGRESSION' from the synopsis. We have a defensive workaround for the problem, to restore the floating point control word if third-party native code does not.
04-09-2007
SUGGESTED FIX Webrev at http://jruntime.east/~ik199011/my_webrevs/6550813_7.0_webrev/
13-08-2007
WORK AROUND Renaming the AXShlEx.dll usually makes Azureus work again
25-05-2007
EVALUATION The initial eveluator, an engineer from Azurius and myself could dot reproduce the crash. Finally it was revealed at http://forum.alcohol-soft.com/index.php?s=fe16f40d559330c7833ad09271e9ed19&showtopic=25775&hl=azureus&st=20 that these crashes are caused by AXShlEx.dll when one downloads MDS files. Because MDS files are likely to contain non-ligitimate media data Alcohol guys dodn't want to persue this issue any more. I will lower the priority of this bug.
25-05-2007

Duplicate :	JDK-6551856 - Azureus doesn't work with Java 6 Update 1
Duplicate :	JDK-6825772 - DEBUG MESSAGE: corrupted control word detected
Duplicate :	JDK-6346124 - vm should be resilient against jni code that changes fpu control word
Relates :	JDK-6192333 - AMD64: linux/solaris: vm should not restore mxcsr across native calls
Relates :	JDK-7012961 - runtime/jni/WindowsExceptionFilter/WindowsExceptionFilter01 crashes on windows-amd64
Relates :	JDK-6825772 - DEBUG MESSAGE: corrupted control word detected
Relates :	JDK-6918421 - in-process JVM now ignores preset Windows unhandled exception filter
Relates :	JDK-8295159 - DSO created with -ffast-math breaks Java floating-point arithmetic