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  1. JDK
  2. JDK-6604107

PrintServiceLookup.lookupPrintServices is not thread-safe

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 5.0
    • Fix Version/s: 5.0u21
    • Component/s: client-libs
    • Labels:
    • Subcomponent:
      2d
    • CPU:
      x86
    • OS:
      linux

      Description

      FULL PRODUCT VERSION :
      java version "1.5.0_12"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
      Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      Linux firenze 2.4.21-32.ELsmp #1 SMP Fri Apr 15 21:17:59 EDT 2005 i686 i686 i386 GNU/Linux

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      CUPS with a couple of printers (I used 4 printers to reproduce this, but in production we have something like 70 printers)

      A DESCRIPTION OF THE PROBLEM :
      The method PrintServiceLookup.lookupPrintServices is not thread-safe on Linux. It either causes threads to hang or it causes a VM crash due to a race-condition in an OpenSSL call.

      This is fixed in JDK-1.6, but it is still a major bug in 1-5, which should be fixed there (even if just synchronizing the call on Linux).

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Call PrintServiceLookup.lookupPrintServices from multiple threads.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      PrintServiceLookup.lookupPrintServices should be thread-safe.
      ACTUAL -
      VM crashes in OpenSSL call or PrintServiceLookup.lookupPrintServices hangs.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Stack of hung threads:

      Thread 30235: (state = IN_NATIVE)
       - sun.print.CUPSPrinter.canConnect(java.lang.String, int) @bci=0 (Interpreted frame)
       - sun.print.CUPSPrinter.isCupsRunning() @bci=71, line=352 (Interpreted frame)
       - sun.print.UnixPrintServiceLookup.getPrintServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=125, line=351 (Interpreted frame)
       - javax.print.PrintServiceLookup.getServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=65, line=359 (Interpreted frame)
       - javax.print.PrintServiceLookup.lookupPrintServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=2, line=105 (Interpreted frame)
       - Test$Job.run() @bci=42, line=42 (Interpreted frame)
       - java.lang.Thread.run() @bci=11, line=595 (Interpreted frame)


      Thread 30220: (state = IN_NATIVE)
       - sun.print.CUPSPrinter.canConnect(java.lang.String, int) @bci=0 (Interpreted frame)
       - sun.print.CUPSPrinter.isCupsRunning() @bci=71, line=352 (Interpreted frame)
       - sun.print.UnixPrintServiceLookup.getPrintServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=125, line=351 (Interpreted frame)
       - javax.print.PrintServiceLookup.getServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=65, line=359 (Interpreted frame)
       - javax.print.PrintServiceLookup.lookupPrintServices(javax.print.DocFlavor, javax.print.attribute.AttributeSet) @bci=2, line=105 (Interpreted frame)
       - Test$Job.run() @bci=42, line=42 (Interpreted frame)
       - java.lang.Thread.run() @bci=11, line=595 (Interpreted frame)



      Dump of crash in OpenSSL:
      #
      # An unexpected error has been detected by HotSpot Virtual Machine:
      #
      # SIGSEGV (0xb) at pc=0x66c0bbda, pid=31106, tid=1745222576
      #
      # Java VM: Java HotSpot(TM) Server VM (1.5.0_12-b04 mixed mode)
      # Problematic frame:
      # C [libcrypto.so.4+0x73bda]
      #
      d, id=31112]

      Other Threads:
        0x08111300 VMThread [id=31111]
        0x0806dda8 WatcherThread [id=31119]

      VM state:not at safepoint (normal execution)

      VM Mutex/Monitor currently owned by a thread: None

      Heap
       PSYoungGen total 21952K, used 19948K [0xa9aa0000, 0xab080000, 0xb09b0000)
        eden space 21696K, 90% used [0xa9aa0000,0xaaddd100,0xaafd0000)
        from space 256K, 96% used [0xab020000,0xab05e050,0xab060000)
        to space 320K, 0% used [0xaafd0000,0xaafd0000,0xab020000)
       PSOldGen total 56896K, used 0K [0x721b0000, 0x75940000, 0xa9aa0000)
        object space 56896K, 0% used [0x721b0000,0x721b0000,0x75940000)
       PSPermGen total 16384K, used 2336K [0x6e1b0000, 0x6f1b0000, 0x721b0000)
        object space 16384K, 14% used [0x6e1b0000,0x6e3f83

      --------------- S Y S T E M ---------------

      OS:Red Hat Enterprise Linux ES release 3 (Taroon Update 5)

      uname:Linux 2.4.21-32.ELsmp #1 SMP Fri Apr 15 21:17:59 EDT 2005 i686
      libc:glibc 2.3.2 NPTL 0.60
      rlimit: STACK 10240k, CORE 0k, NPROC 16384, NOFILE 65536, AS infinity
      load average:0.46 0.60 0.31

      CPU:total 4 (cores per cpu 1, threads per core 2) family 15 model 4 stepping 3, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ht

      Memory: 4k page, physical 4093444k(35696k free), swap 2000k(1810k free)

      vm_info: Java HotSpot(TM) Server VM (1.5.0_12-b04) for linux-x86, built on May 2 2007 02:13:16 by java_re with gcc 3.2.1-7a (J2SE release)



      REPRODUCIBILITY :
      This bug can be reproduced often.

      ---------- BEGIN SOURCE ----------
      import javax.print.DocFlavor;
      import javax.print.PrintService;
      import javax.print.PrintServiceLookup;

      /**
       * On JDK-1.5.0_12 on Linux x86 this test case hangs or crashes.
       *
       * @author Ortwin Glück
       */
      public class Test implements Runnable{
          Object latch = new Object();
          
          public static void main(String[] args) {
              Test app = new Test();
              app.run();
          }

          public void run() {
              int THREADS = 200;
              for (int i=0; i<THREADS; i++) {
                  Thread t = new Thread(new Job());
                  t.setDaemon(false);
                  t.start();
              }
              try {
                  Thread.sleep(1000);
              } catch (InterruptedException e) {
              }
              
              synchronized (latch) {
                  latch.notifyAll();
              }
              
          }
          
          private class Job implements Runnable {

              public void run() {
                  synchronized (latch) {
                      try {
                          latch.wait();
                      } catch (InterruptedException e) {
                          e.printStackTrace();
                      }
                  }
                  PrintService[] services = PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.AUTOSENSE, null);
                  System.out.println(services.length);
              }
              
          }
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Synchronize calls to PrintServiceLookup.lookupPrintServices().
        Fixed in JDK-1.6.

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              Assignee:
              dmeetry Dmeetry Degrave (Inactive)
              Reporter:
              prr Philip Race
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