On 11/07/2012 22:39, Filip Hanik (mailing lists) wrote: > Ok, I have a resolution to this, it's a IPv6 problem. The reason it worked > on my virtual machine, is cause the virtual machine doesn't have IPv6 > > When I add > <jvmarg value="-Djava.net.preferIPv4Stack=true"/> > > To the unit tests, it works fine on Windows. > > Here is what led me to believe in this: > http://blog.bielu.com/2011/11/hotspot-64bit-server-hangs-on-socket.html
Hmm. It looks like Oracle failed to reproduce the issue - possibly because the IPv6 part was not clear in the original bug report. Probably time to raise an issue with Oracle with clearer instructions to reproduce. (I have a clean Win 7 VM I am happy to trial any test case on if that helps). Mark > >> -----Original Message----- >> From: Filip Hanik (mailing lists) [mailto:devli...@hanik.com] >> Sent: Wednesday, July 11, 2012 2:54 PM >> To: 'Tomcat Developers List' >> Subject: RE: Unit tests and trunk >> >> The idea of creating a VM that is like mine was a good one. >> I did a clean install of Windows 7 64 bit, and it works like a charm. >> My network stack must have something installed at the network stack >> >> Filip >> >>> -----Original Message----- >>> From: Mark Thomas [mailto:ma...@apache.org] >>> Sent: Wednesday, July 11, 2012 1:32 PM >>> To: Tomcat Developers List >>> Subject: Re: Unit tests and trunk >>> >>> On 11/07/2012 20:13, Filip Hanik (mailing lists) wrote: >>>> >>>> >>>>> -----Original Message----- >>>>> From: Filip Hanik (mailing lists) [mailto:devli...@hanik.com] >>>>> Sent: Wednesday, July 11, 2012 10:13 AM >>>>> To: 'Tomcat Developers List' >>>>> Subject: RE: Unit tests and trunk >>>>> >>>>> >>>>> >>>>>> -----Original Message----- >>>>>> From: Mark Thomas [mailto:ma...@apache.org] >>>>>> Sent: Wednesday, July 11, 2012 2:45 AM >>>>>> To: Tomcat Developers List >>>>>> Subject: Re: Unit tests and trunk >>>>>> >>>>>> On 11/07/2012 02:27, Filip Hanik (mailing lists) wrote: >>>>>>> Here's what I've found out so far >>>>>>> >>>>>>> The patch below does solve the problem. In a rather remarkable >> way. >>>>>>> The line >>>>>>> int cnt = socket.write(buf); //write the data >>>>>>> >>>>>>> never returns 0, meaning the writes are always blocking. Even >>> though >>>>>> they >>>>>>> are not supposed to be. >>>>>>> Remove this patch, and socket.write(buf) returns 0, and then we >>>>> never >>>>>> get >>>>>>> issued the OP_WRITE from the selector itself. >>>>>> >>>>>> I'm not sure I follow the above. Remove the patch and it returns >> 0? >>>>> [Filip Hanik] >>>>> Correct, as it should. The buffer should fill up very quick, and >> when >>>>> the >>>>> buffer is full NIO returns 0, can't write. >>>>> So there are two problems: >>>>> a) The selector doesn't work the same in Java 7 as it does in Java >> 5 >>> and >>>>> 6 >>>>> b) Starting a new selector turns non blocking writes into blocking, >>> even >>>>> when I write 10MB in the TestOutputBuffer test, there is not a >> single >>>>> socket.write that returns 0. Removing the Selector.open call, and >>>>> immediately we have a hit return 0 as expected. >>>>> >>>>> >>>>>> >>>>>> Regardless, it seems very strange that the patch below fixes it. I >>> had >>>>> a >>>>>> quick look through the Java source and couldn't see anything >>>>> immediately >>>>>> obvious. Any ideas what is going on? >>>>> [Filip Hanik] >>>>> Can't think of anything but a bug in the JDK. I'll keep >>> investigating. >>>>> Possibly we have to move the async NIO stuff to get it to work >>>> [Filip Hanik] >>>> Btw, this affects the BIO connector too. The write blocks and hangs >>> forever. >>>> Maybe it's just my Windows 7 system. Works fine on linux. >>> >>> Let me see if I can find (or create if necessary) a clean-ish Windows >> 7 >>> VM to test this on. >>> >>> Mark >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org >>> For additional commands, e-mail: dev-h...@tomcat.apache.org >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: dev-h...@tomcat.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: dev-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
