(or vice versa).

See http://stackoverflow.com/questions/3264665/c-stat-and-daylight-savings

*** first do this inside Cygwin window ***
pc /cygdrive/d/tmp/jdk1.8.0_40$ bin/java -Xshare:dump
Allocated shared space: 27394048 bytes at 0x14600000
Loading classes to share ...
Preload Warning: Cannot find javax/swing/JComponent$2
Preload Warning: Cannot find javax/swing/RepaintManager$1$1
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue$1
Preload Warning: Cannot find javax/swing/text/AbstractDocument$InsertStringResult
Preload Warning: Cannot find sun/awt/windows/WToolkit$3$1
Preload Warning: Cannot find sun/java2d/Disposer$2
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1$1
Loading classes to share: done.
Rewriting and linking classes ...
Rewriting and linking classes: done
Number of classes 2383
    instance classes = 2369
    obj array classes = 6
    type array classes = 8
Calculating fingerprints ... done.
Removing unshareable information ... done.
Shared Lookup Cache Table Buckets = 4108 bytes
Shared Lookup Cache Table Body = 50352 bytes
ro space: 6009512 [ 48.9% of total] out of 12582912 bytes [47.8% used] at 0x14600000
rw space: 5467544 [ 44.5% of total] out of 12582912 bytes [43.5% used] at 0x15200000
md space: 772336 [ 6.3% of total] out of 2097152 bytes [36.8% used] at 0x15e00000
mc space: 34032 [ 0.3% of total] out of 131072 bytes [26.0% used] at 0x16000000
total : 12283424 [100.0% of total] out of 27394048 bytes [44.8% used]
pc /cygdrive/d/tmp/jdk1.8.0_40$ bin/java -Xshare:on -version
java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b27)
Java HotSpot(TM) Client VM (build 25.40-b25, mixed mode, sharing)

*** then do this in a CMD window ***

D:\tmp\jdk1.8.0_40>bin\java -Xshare:on -version
An error has occurred while processing the shared archive file.
shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)
Error occurred during initialization of VM
Unable to use shared archive.

*** re-dumping the archive inside the CMD window fixes it ***

D:\tmp\jdk1.8.0_40>bin\java -Xshare:dump
Allocated shared space: 27394048 bytes at 0x14800000
Loading classes to share ...
Preload Warning: Cannot find javax/swing/JComponent$2
Preload Warning: Cannot find javax/swing/RepaintManager$1$1
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue$1
Preload Warning: Cannot find javax/swing/text/AbstractDocument$InsertStringResult
Preload Warning: Cannot find sun/awt/windows/WToolkit$3$1
Preload Warning: Cannot find sun/java2d/Disposer$2
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1$1
Loading classes to share: done.
Rewriting and linking classes ...
Rewriting and linking classes: done
Number of classes 2383
    instance classes = 2369
    obj array classes = 6
    type array classes = 8
Calculating fingerprints ... done.
Removing unshareable information ... done.
Shared Lookup Cache Table Buckets = 4108 bytes
Shared Lookup Cache Table Body = 50352 bytes
ro space: 6009512 [ 48.9% of total] out of 12582912 bytes [47.8% used] at 0x14800000
rw space: 5467544 [ 44.5% of total] out of 12582912 bytes [43.5% used] at 0x15400000
md space: 772336 [ 6.3% of total] out of 2097152 bytes [36.8% used] at 0x16000000
mc space: 34032 [ 0.3% of total] out of 131072 bytes [26.0% used] at 0x16200000
total : 12283424 [100.0% of total] out of 27394048 bytes [44.8% used]

D:\tmp\jdk1.8.0_40>bin\java -Xshare:on -version
java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b27)
Java HotSpot(TM) Client VM (build 25.40-b25, mixed mode, sharing)

*** switch back to the cygwin window -- now it's broken in cygwin window ***

pc /cygdrive/d/tmp/jdk1.8.0_40$ bin/java -Xshare:on -version
Error occurred during initialization of VM
Unable to use shared archive.
An error has occurred while processing the shared archive file.
shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)

===================
pc /cygdrive/d/tmp/jdk1.8.0_40$ uname -a
CYGWIN_NT-6.1-WOW64 xxxxx 1.7.31(0.272/5/3) 2014-07-25 11:08 i686 Cygwin

Windows 7 Professional, Service Pack 1