Your message dated Fri, 15 Apr 2016 19:38:07 +0000 with message-id <[email protected]> and subject line Bug#820703: Removed package(s) from unstable has caused the Debian Bug report #717047, regarding openjdk-7-jre-headless: ServerSocketChannel stays bound after close when selector waits for accept to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 717047: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717047 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: openjdk-7-jre-headless Version: 7u21-2.3.9-5 Severity: normal When a ServerSocketChannel is bound to a port and a thread waits on a selector for an accept on that channel, if the channel is closed by another thread, it stays bound. This problem seems kernel related since the channel is properly closed with kernel version 3.2.0-4-amd64, but is not with kernel version 3.9-1-amd64. The Java code below demonstrates the problem. When this code runs, the listening socket can be monitored with watch -n 1 'netstat -n -l | grep 9080' With kernel version 3.2.0-4-amd64, the listening socket disappears just after the channel is closed. Whilst with kernel version 3.9-1-amd64, the channel is closed only when the application terminates. Interestingly, if instead of channel.close the shutdown C function (sys/socket.h) is called via JNI by retrieving the underlying socket file descriptor stored in the ServerSocketChannel, then the channel is properly unbound. While if channel.close is called before shutdown, it is not. import java.net.InetSocketAddress; import java.nio.channels.ServerSocketChannel; import java.nio.channels.Selector; import java.nio.channels.SelectionKey; import java.util.Set; import java.util.Iterator; class shutdown { private static class MainSelector extends Thread { private final Selector selector; public MainSelector(Selector selector) { this.selector = selector; } public void run() { try { selector.select(); Set<SelectionKey> keys = selector.selectedKeys(); Iterator<SelectionKey> iterator = keys.iterator(); SelectionKey key = iterator.next(); if (key.isValid()) System.out.println("valid key"); if (key.isAcceptable()) System.out.println("acceptable key"); int readyOps = key.readyOps(); key.interestOps(key.interestOps() & ~readyOps); keys.clear(); } catch (Exception e) { System.out.println(e); } } } public static void main(String[] args) throws Exception { InetSocketAddress address = new InetSocketAddress("localhost", 9080); Selector selector = Selector.open(); ServerSocketChannel channel = ServerSocketChannel.open(); channel.configureBlocking(false); channel.bind(address); channel.register(selector, SelectionKey.OP_ACCEPT); Thread mainSelector = new MainSelector(selector); mainSelector.start(); Thread.sleep(3000); System.out.println("close channel"); channel.close(); Thread.sleep(3000); mainSelector.interrupt(); } } -- System Information: Debian Release: jessie/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.9-1-amd64 (SMP w/4 CPU cores) Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages openjdk-7-jre-headless depends on: ii ca-certificates-java 20121112+nmu2 ii java-common 0.47 ii libc6 2.17-7 ii libcups2 1.6.2-10 ii libfontconfig1 2.10.2-2 ii libfreetype6 2.4.9-1.1 ii libgcc1 1:4.8.1-2 ii libglib2.0-0 2.36.3-3 ii libjpeg8 8d-1 ii liblcms2-2 2.2+git20110628-2.2 ii libnss3 2:3.15-1 ii libpcsclite1 1.8.8-3 ii libstdc++6 4.8.1-2 ii multiarch-support 2.17-7 ii openjdk-7-jre-lib 7u21-2.3.9-5 ii tzdata-java 2013c-2 ii zlib1g 1:1.2.8.dfsg-1 Versions of packages openjdk-7-jre-headless recommends: pn icedtea-7-jre-jamvm <none> Versions of packages openjdk-7-jre-headless suggests: pn fonts-ipafont-gothic <none> pn fonts-ipafont-mincho <none> ii libnss-mdns 0.10-3.2 pn sun-java6-fonts <none> ii ttf-dejavu-extra 2.33+svn2514-3 pn ttf-indic-fonts <none> pn ttf-wqy-microhei | ttf-wqy-zenhei <none> -- no debconf information
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--- Begin Message ---Version: 7u95-2.6.4-1+rm Dear submitter, as the package openjdk-7 has just been removed from the Debian archive unstable we hereby close the associated bug reports. We are sorry that we couldn't deal with your issue properly. For details on the removal, please see https://bugs.debian.org/820703 The version of this package that was in Debian prior to this removal can still be found using http://snapshot.debian.org/. This message was generated automatically; if you believe that there is a problem with it please contact the archive administrators by mailing [email protected]. Debian distribution maintenance software pp. Scott Kitterman (the ftpmaster behind the curtain)
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