found this linked off the php version of the bug: http://www.exploringbinary.com/why-volatile-fixes-the-2-2250738585072011e-308-bug/
<http://www.exploringbinary.com/why-volatile-fixes-the-2-2250738585072011e-308-bug/>which would lead me to believe that the bug is actually a call from byte-code down the the JVM expecting a double operation to produce an error smaller than epsilon, the JVM uses the hardware instruction, which for that value does not produce a smaller error, so the loop never terminates... oops. apparently another representation of the (in)famous GCC bug 323: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 TL;DR; floating point math is hard... On 14 February 2011 11:10, Christian Catchpole <ato...@catchpole.net> wrote: > It could be either. But my guess is Java. Is is "just a parser" and > nothing fundamental that a JIT would be doing. > > > In other news are you coming to the roundup? you're a great presence on > the > > google group, would be good to meet you in person. > > Thanks dude. I'v been wanting to go. When the details for this year > were posted I started looking at flight prices (from Australia!) etc. > I'm between contracts at the moment so I do have the time, but > ironically, not the money. :( > > I'll be there if someone sponsors me :) > > CC > > On Feb 14, 8:13 am, Matthew Kerle <mattke...@gmail.com> wrote: > > thanks Christian! So would you say then the bug is in the Java code > called > > by Double.parse()? from the nature of the advisory I thought it was a bug > in > > some native code running in the JVM... > > > > In other news are you coming to the roundup? you're a great presence on > the > > google group, would be good to meet you in person. > > > > cheers! > > > > On 13 February 2011 21:21, Christian Catchpole <ato...@catchpole.net> > wrote: > > > > > > > > > > > > > It's real. I tried it (before I read the reports that described it) > > > > >http://twitpic.com/3vwtcq > > > > > Certain rare cases cause the parsing method to get stuck in a loop. > > > I'v never written a double parser but I can imagine how it happens. > > > Perhaps it's a while(value > 0) loop that expects the value will > > > always be decremented and exit the loop. but in some cases, it's not. > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "The Java Posse" group. > > > To post to this group, send email to javaposse@googlegroups.com. > > > To unsubscribe from this group, send email to > > > javaposse+unsubscr...@googlegroups.com. > > > For more options, visit this group at > > >http://groups.google.com/group/javaposse?hl=en. > > > > -- > > "life is complex, it has both real and imaginary components" > http://threebrightlights.blogspot.com > > -- > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > To post to this group, send email to javaposse@googlegroups.com. > To unsubscribe from this group, send email to > javaposse+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > > -- "life is complex, it has both real and imaginary components" http://threebrightlights.blogspot.com -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to javaposse@googlegroups.com. To unsubscribe from this group, send email to javaposse+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
