title: JNI 'problematic frame' causes JVM to crash
body: <p>I'm using JNI to access the exiv2 library (written in C++) in Java and I'm getting a weird runtime error in the JNI code. I've tried using various -Xms and -Xmx options, but that seems to have no affect. I've also tried running this code on JDK1.7.0 with the same result.</p>
  
  <pre><code> # A fatal error has been detected by the Java Runtime Environment:
   #
   #  SIGSEGV (0xb) at pc=0x00007ff31807757f, pid=4041, tid=140682078746368
   #
   # JRE version: 6.0_20-b20
   # Java VM: OpenJDK 64-Bit Server VM (19.0-b09 mixed mode linux-amd64 )
   # Derivative: IcedTea6 1.9.2
   # Distribution: Ubuntu 10.10, package 6b20-1.9.2-0ubuntu2
   # Problematic frame:
   # V  [libjvm.so+0x42757f]
   #
   # If you would like to submit a bug report, please include
   # instructions how to reproduce the bug and visit:
   #   https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
   #
   ---------------  T H R E A D  ---------------
  
   Current thread (0x000000000190d000):  JavaThread "main" [_thread_in_Java, id=4043, stack(0x00007ff319447000,0x00007ff319548000)]
  
   siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x0000000000000024
  
   Registers:
   ...
  
   Register to memory mapping:
  
   ...
  
   RDX=0x00007ff3195463f8
   0x00007ff3195463f8 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   RSP=0x00007ff319546270
   0x00007ff319546270 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   RBP=0x00007ff319546270
   0x00007ff319546270 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   RSI=0x0000000000000024
   0x0000000000000024 is pointing to unknown location
  
   RDI=0x00007ff3195463e0
   0x00007ff3195463e0 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   R8 =0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   ...
  
   R10=0x00007ff319546300
   0x00007ff319546300 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   R11=0x0000000000000002
   0x0000000000000002 is pointing to unknown location
  
   R12=0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   R13=0x00007ff319546560
   0x00007ff319546560 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   R14=0x00007ff3195463e0
   0x00007ff3195463e0 is pointing into the stack for thread: 0x000000000190d000
   "main" prio=10 tid=0x000000000190d000 nid=0xfcb runnable [0x0000000000000000]
      java.lang.Thread.State: RUNNABLE
  
   ...
  
  
   Top of Stack: (sp=0x00007ff319546270)
   ...
  
   Instructions: (pc=0x00007ff31807757f)
   ...
  
   Stack: [0x00007ff319447000,0x00007ff319548000],  sp=0x00007ff319546270,  free space=1020k
   Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
   V  [libjvm.so+0x42757f]
   V  [libjvm.so+0x42866b]
   V  [libjvm.so+0x4275c8]
   V  [libjvm.so+0x4331bd]
   V  [libjvm.so+0x44e5c7]
   C  [libExiff2-binding.so+0x1f16]  _ZN7JNIEnv_15CallVoidMethodAEP8_jobjectP10_jmethodIDPK6jvalue+0x40
   C  [libExiff2-binding.so+0x1b96]  _Z8loadIPTCSt8auto_ptrIN5Exiv25ImageEEPKcP7JNIEnv_P8_jobject+0x2ba
   C  [libExiff2-binding.so+0x1d3f]  _Z7getVarsPKcP7JNIEnv_P8_jobject+0x176
   C  [libExiff2-binding.so+0x1de7]  Java_photo_exiv2_Exiv2MetaDataStore_impl_1loadFromExiv+0x4b
   j  photo.exiv2.Exiv2MetaDataStore.impl_loadFromExiv(Ljava/lang/String;Lphoto/exiv2/Exiv2MetaDataStore;)V+0
   j  photo.exiv2.Exiv2MetaDataStore.loadFromExiv2()V+9
   j  photo.exiv2.Exiv2MetaDataStore.loadData()V+1
   j  photo.exiv2.Exiv2MetaDataStore.&lt;init&gt;(Lphoto/ImageFile;)V+10
   j  test.Main.main([Ljava/lang/String;)V+76
   v  ~StubRoutines::call_stub
   V  [libjvm.so+0x428698]
   V  [libjvm.so+0x4275c8]
   V  [libjvm.so+0x432943]
   V  [libjvm.so+0x447f91]
   C  [java+0x3495]  JavaMain+0xd75
  
  
   ---------------  P R O C E S S  ---------------
  
   Java Threads: ( =&gt; current thread )
     0x00007ff2c4027800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=4060, stack(0x00007ff2c9052000,0x00007ff2c9153000)]
     0x00007ff2c4025000 JavaThread "CompilerThread1" daemon [_thread_blocked, id=4059, stack(0x00007ff2c9153000,0x00007ff2c9254000)]
     0x00007ff2c4022000 JavaThread "CompilerThread0" daemon [_thread_blocked, id=4058, stack(0x00007ff2c9254000,0x00007ff2c9355000)]
     0x00007ff2c401f800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=4057, stack(0x00007ff2c9355000,0x00007ff2c9456000)]
     0x00007ff2c4001000 JavaThread "Finalizer" daemon [_thread_blocked, id=4056, stack(0x00007ff2c994d000,0x00007ff2c9a4e000)]
     0x0000000001984000 JavaThread "Reference Handler" daemon [_thread_blocked, id=4055, stack(0x00007ff2c9a4e000,0x00007ff2c9b4f000)]
   =&gt;0x000000000190d000 JavaThread "main" [_thread_in_Java, id=4043, stack(0x00007ff319447000,0x00007ff319548000)]
  
   Other Threads:
     0x000000000197d800 VMThread [stack: 0x00007ff2c9b4f000,0x00007ff2c9c50000] [id=4054]
     0x00007ff2c4032000 WatcherThread [stack: 0x00007ff2c8f51000,0x00007ff2c9052000] [id=4061]
  
   VM state:not at safepoint (normal execution)
  
   VM Mutex/Monitor currently owned by a thread: None
  
   Heap
    PSYoungGen      total 18432K, used 316K [0x00007ff2fed30000, 0x00007ff3001c0000, 0x00007ff313730000)
     eden space 15808K, 2% used [0x00007ff2fed30000,0x00007ff2fed7f0b8,0x00007ff2ffca0000)
     from space 2624K, 0% used [0x00007ff2fff30000,0x00007ff2fff30000,0x00007ff3001c0000)
     to   space 2624K, 0% used [0x00007ff2ffca0000,0x00007ff2ffca0000,0x00007ff2fff30000)
    PSOldGen        total 42240K, used 0K [0x00007ff2d5930000, 0x00007ff2d8270000, 0x00007ff2fed30000)
     object space 42240K, 0% used [0x00007ff2d5930000,0x00007ff2d5930000,0x00007ff2d8270000)
    PSPermGen       total 21248K, used 2827K [0x00007ff2cb330000, 0x00007ff2cc7f0000, 0x00007ff2d5930000)
     object space 21248K, 13% used [0x00007ff2cb330000,0x00007ff2cb5f2f60,0x00007ff2cc7f0000)
  
   Dynamic libraries:
   00400000-00409000 r-xp 00000000 08:03 141899                             /usr/lib/jvm/java-6-openjdk/jre/bin/java
   00608000-00609000 r--p 00008000 08:03 141899                             /usr/lib/jvm/java-6-openjdk/jre/bin/java
   00609000-0060a000 rw-p 00009000 08:03 141899                             /usr/lib/jvm/java-6-openjdk/jre/bin/java
   01904000-019ad000 rw-p 00000000 00:00 0                                  [heap]
   ...
   7ff2c820c000-7ff2c8232000 r-xp 00000000 08:03 917704                     /lib/libexpat.so.1.5.2
   7ff2c8232000-7ff2c8432000 ---p 00026000 08:03 917704                     /lib/libexpat.so.1.5.2
   7ff2c8432000-7ff2c8434000 r--p 00026000 08:03 917704                     /lib/libexpat.so.1.5.2
   7ff2c8434000-7ff2c8435000 rw-p 00028000 08:03 917704                     /lib/libexpat.so.1.5.2
   7ff2c8435000-7ff2c844a000 r-xp 00000000 08:03 917708                     /lib/libgcc_s.so.1
   7ff2c844a000-7ff2c8649000 ---p 00015000 08:03 917708                     /lib/libgcc_s.so.1
   7ff2c8649000-7ff2c864a000 r--p 00014000 08:03 917708                     /lib/libgcc_s.so.1
   7ff2c864a000-7ff2c864b000 rw-p 00015000 08:03 917708                     /lib/libgcc_s.so.1
   7ff2c864b000-7ff2c8733000 r-xp 00000000 08:03 134995                     /usr/lib/libstdc++.so.6.0.14
   7ff2c8733000-7ff2c8932000 ---p 000e8000 08:03 134995                     /usr/lib/libstdc++.so.6.0.14
   7ff2c8932000-7ff2c893a000 r--p 000e7000 08:03 134995                     /usr/lib/libstdc++.so.6.0.14
   7ff2c893a000-7ff2c893c000 rw-p 000ef000 08:03 134995                     /usr/lib/libstdc++.so.6.0.14
   7ff2c893c000-7ff2c8951000 rw-p 00000000 00:00 0 
   7ff2c8951000-7ff2c8af3000 r-xp 00000000 08:03 134599                     /usr/lib/libexiv2.so.6.0.0
   7ff2c8af3000-7ff2c8cf2000 ---p 001a2000 08:03 134599                     /usr/lib/libexiv2.so.6.0.0
   7ff2c8cf2000-7ff2c8d0f000 r--p 001a1000 08:03 134599                     /usr/lib/libexiv2.so.6.0.0
   7ff2c8d0f000-7ff2c8d10000 rw-p 001be000 08:03 134599                     /usr/lib/libexiv2.so.6.0.0
   7ff2c8d10000-7ff2c8d23000 rw-p 00000000 00:00 0 
   7ff2c8d42000-7ff2c8d45000 r-xp 00000000 08:03 800718                     /home/hjed/libExiff2-binding.so
   7ff2c8d45000-7ff2c8f44000 ---p 00003000 08:03 800718                     /home/hjed/libExiff2-binding.so
   7ff2c8f44000-7ff2c8f45000 r--p 00002000 08:03 800718                     /home/hjed/libExiff2-binding.so
   7ff2c8f45000-7ff2c8f46000 rw-p 00003000 08:03 800718                     /home/hjed/libExiff2-binding.so
   7ff2c8f46000-7ff2c8f49000 r--s 0000f000 08:03 141333                     /usr/lib/jvm/java-6-openjdk/jre/lib/ext/pulse-java.jar
   7ff2c8f49000-7ff2c8f51000 r--s 00066000 08:03 408472                     /usr/share/java/gnome-java-bridge.jar
   ...
   7ff2ca559000-7ff2ca55b000 r--s 0001d000 08:03 141354                     /usr/lib/jvm/java-6-openjdk/jre/lib/plugin.jar
   7ff2ca55b000-7ff2ca560000 r--s 00044000 08:03 141353                     /usr/lib/jvm/java-6-openjdk/jre/lib/netx.jar
   7ff2ca560000-7ff2ca592000 rw-p 00000000 00:00 0 
   7ff2ca592000-7ff2ca720000 r--s 038af000 08:03 141833                     /usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar
   ...
   7ff31673b000-7ff316742000 r-xp 00000000 08:03 141867                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libzip.so
   7ff316742000-7ff316941000 ---p 00007000 08:03 141867                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libzip.so
   7ff316941000-7ff316942000 r--p 00006000 08:03 141867                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libzip.so
   7ff316942000-7ff316943000 rw-p 00007000 08:03 141867                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libzip.so
   7ff316943000-7ff31694f000 r-xp 00000000 08:03 921396                     /lib/libnss_files-2.12.1.so
   7ff31694f000-7ff316b4e000 ---p 0000c000 08:03 921396                     /lib/libnss_files-2.12.1.so
   7ff316b4e000-7ff316b4f000 r--p 0000b000 08:03 921396                     /lib/libnss_files-2.12.1.so
   7ff316b4f000-7ff316b50000 rw-p 0000c000 08:03 921396                     /lib/libnss_files-2.12.1.so
   7ff316b50000-7ff316b5a000 r-xp 00000000 08:03 921398                     /lib/libnss_nis-2.12.1.so
   7ff316b5a000-7ff316d59000 ---p 0000a000 08:03 921398                     /lib/libnss_nis-2.12.1.so
   7ff316d59000-7ff316d5a000 r--p 00009000 08:03 921398                     /lib/libnss_nis-2.12.1.so
   7ff316d5a000-7ff316d5b000 rw-p 0000a000 08:03 921398                     /lib/libnss_nis-2.12.1.so
   7ff316d5b000-7ff316d63000 r-xp 00000000 08:03 921393                     /lib/libnss_compat-2.12.1.so
   7ff316d63000-7ff316f62000 ---p 00008000 08:03 921393                     /lib/libnss_compat-2.12.1.so
   7ff316f62000-7ff316f63000 r--p 00007000 08:03 921393                     /lib/libnss_compat-2.12.1.so
   7ff316f63000-7ff316f64000 rw-p 00008000 08:03 921393                     /lib/libnss_compat-2.12.1.so
   7ff316f64000-7ff316f6c000 r-xp 00000000 08:03 141869                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads/libhpi.so
   7ff316f6c000-7ff31716b000 ---p 00008000 08:03 141869                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads/libhpi.so
   7ff31716b000-7ff31716c000 r--p 00007000 08:03 141869                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads/libhpi.so
   7ff31716c000-7ff31716d000 rw-p 00008000 08:03 141869                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads/libhpi.so
   7ff31716d000-7ff317184000 r-xp 00000000 08:03 921392                     /lib/libnsl-2.12.1.so
   7ff317184000-7ff317383000 ---p 00017000 08:03 921392                     /lib/libnsl-2.12.1.so
   7ff317383000-7ff317384000 r--p 00016000 08:03 921392                     /lib/libnsl-2.12.1.so
   7ff317384000-7ff317385000 rw-p 00017000 08:03 921392                     /lib/libnsl-2.12.1.so
   7ff317385000-7ff317387000 rw-p 00000000 00:00 0 
   7ff317387000-7ff3173b2000 r-xp 00000000 08:03 141850                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjava.so
   7ff3173b2000-7ff3175b1000 ---p 0002b000 08:03 141850                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjava.so
   7ff3175b1000-7ff3175b2000 r--p 0002a000 08:03 141850                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjava.so
   7ff3175b2000-7ff3175b5000 rw-p 0002b000 08:03 141850                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjava.so
   7ff3175b5000-7ff3175c3000 r-xp 00000000 08:03 141866                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libverify.so
   7ff3175c3000-7ff3177c2000 ---p 0000e000 08:03 141866                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libverify.so
   7ff3177c2000-7ff3177c4000 r--p 0000d000 08:03 141866                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libverify.so
   7ff3177c4000-7ff3177c5000 rw-p 0000f000 08:03 141866                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libverify.so
   7ff3177c5000-7ff3177cc000 r-xp 00000000 08:03 921405                     /lib/librt-2.12.1.so
   7ff3177cc000-7ff3179cb000 ---p 00007000 08:03 921405                     /lib/librt-2.12.1.so
   7ff3179cb000-7ff3179cc000 r--p 00006000 08:03 921405                     /lib/librt-2.12.1.so
   7ff3179cc000-7ff3179cd000 rw-p 00007000 08:03 921405                     /lib/librt-2.12.1.so
   7ff3179cd000-7ff317a4f000 r-xp 00000000 08:03 921390                     /lib/libm-2.12.1.so
   7ff317a4f000-7ff317c4e000 ---p 00082000 08:03 921390                     /lib/libm-2.12.1.so
   7ff317c4e000-7ff317c4f000 r--p 00081000 08:03 921390                     /lib/libm-2.12.1.so
   7ff317c4f000-7ff317c50000 rw-p 00082000 08:03 921390                     /lib/libm-2.12.1.so
   7ff317c50000-7ff3184c4000 r-xp 00000000 08:03 141871                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   7ff3184c4000-7ff3186c3000 ---p 00874000 08:03 141871                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   7ff3186c3000-7ff318739000 r--p 00873000 08:03 141871                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   7ff318739000-7ff318754000 rw-p 008e9000 08:03 141871                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   7ff318754000-7ff31878d000 rw-p 00000000 00:00 0 
   7ff31878d000-7ff318907000 r-xp 00000000 08:03 921385                     /lib/libc-2.12.1.so
   7ff318907000-7ff318b06000 ---p 0017a000 08:03 921385                     /lib/libc-2.12.1.so
   7ff318b06000-7ff318b0a000 r--p 00179000 08:03 921385                     /lib/libc-2.12.1.so
   7ff318b0a000-7ff318b0b000 rw-p 0017d000 08:03 921385                     /lib/libc-2.12.1.so
   7ff318b0b000-7ff318b10000 rw-p 00000000 00:00 0 
   7ff318b10000-7ff318b12000 r-xp 00000000 08:03 921388                     /lib/libdl-2.12.1.so
   7ff318b12000-7ff318d12000 ---p 00002000 08:03 921388                     /lib/libdl-2.12.1.so
   7ff318d12000-7ff318d13000 r--p 00002000 08:03 921388                     /lib/libdl-2.12.1.so
   7ff318d13000-7ff318d14000 rw-p 00003000 08:03 921388                     /lib/libdl-2.12.1.so
   7ff318d14000-7ff318d18000 r-xp 00000000 08:03 141838                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/jli/libjli.so
   7ff318d18000-7ff318f17000 ---p 00004000 08:03 141838                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/jli/libjli.so
   7ff318f17000-7ff318f18000 r--p 00003000 08:03 141838                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/jli/libjli.so
   7ff318f18000-7ff318f19000 rw-p 00004000 08:03 141838                     /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/jli/libjli.so
   7ff318f19000-7ff318f31000 r-xp 00000000 08:03 921401                     /lib/libpthread-2.12.1.so
   7ff318f31000-7ff319130000 ---p 00018000 08:03 921401                     /lib/libpthread-2.12.1.so
   7ff319130000-7ff319131000 r--p 00017000 08:03 921401                     /lib/libpthread-2.12.1.so
   7ff319131000-7ff319132000 rw-p 00018000 08:03 921401                     /lib/libpthread-2.12.1.so
   7ff319132000-7ff319136000 rw-p 00000000 00:00 0 
   7ff319136000-7ff31914c000 r-xp 00000000 08:03 917772                     /lib/libz.so.1.2.3.4
   7ff31914c000-7ff31934c000 ---p 00016000 08:03 917772                     /lib/libz.so.1.2.3.4
   7ff31934c000-7ff31934d000 r--p 00016000 08:03 917772                     /lib/libz.so.1.2.3.4
   7ff31934d000-7ff31934e000 rw-p 00017000 08:03 917772                     /lib/libz.so.1.2.3.4
   7ff31934e000-7ff31936e000 r-xp 00000000 08:03 921379                     /lib/ld-2.12.1.so
   ...
   7ff319562000-7ff31956a000 rw-s 00000000 08:03 1966453                    /tmp/hsperfdata_hjed/4041
   ...
   7ff31956e000-7ff31956f000 r--p 00020000 08:03 921379                     /lib/ld-2.12.1.so
   7ff31956f000-7ff319570000 rw-p 00021000 08:03 921379                     /lib/ld-2.12.1.so
   7ff319570000-7ff319571000 rw-p 00000000 00:00 0 
   7fff0fb03000-7fff0fb24000 rw-p 00000000 00:00 0                          [stack]
   7fff0fbff000-7fff0fc00000 r-xp 00000000 00:00 0                          [vdso]
   ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
  
   VM Arguments:
   jvm_args: -Dfile.encoding=UTF-8 
   java_command: test.Main
   Launcher Type: SUN_STANDARD
  
   Environment Variables:
   ...
  
   Signal Handlers:
   SIGSEGV: [libjvm.so+0x712700], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGBUS: [libjvm.so+0x712700], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGFPE: [libjvm.so+0x5d4020], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGPIPE: [libjvm.so+0x5d4020], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGXFSZ: [libjvm.so+0x5d4020], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGILL: [libjvm.so+0x5d4020], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGUSR1: SIG_DFL, sa_mask[0]=0x00000000, sa_flags=0x00000000
   SIGUSR2: [libjvm.so+0x5d3730], sa_mask[0]=0x00000004, sa_flags=0x10000004
   SIGHUP: [libjvm.so+0x5d61a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGINT: SIG_IGN, sa_mask[0]=0x00000000, sa_flags=0x00000000
   SIGTERM: [libjvm.so+0x5d61a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
   SIGQUIT: [libjvm.so+0x5d61a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
  
  
   ---------------  S Y S T E M  ---------------
  
   OS:Ubuntu 10.10 (maverick)
   uname:Linux 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64
   libc:glibc 2.12.1 NPTL 2.12.1 
   rlimit: STACK 8192k, CORE 0k, NPROC infinity, NOFILE 1024, AS infinity
   load average:0.25 0.16 0.21
  
   /proc/meminfo:
   MemTotal:        4048200 kB
   MemFree:         1230476 kB
   Buffers:          589572 kB
   Cached:           911132 kB
   SwapCached:            0 kB
   Active:          1321712 kB
   Inactive:        1202272 kB
   Active(anon):    1023852 kB
   Inactive(anon):     7168 kB
   Active(file):     297860 kB
   Inactive(file):  1195104 kB
   Unevictable:          64 kB
   Mlocked:              64 kB
   SwapTotal:       7065596 kB
   SwapFree:        7065596 kB
   Dirty:               632 kB
   Writeback:             0 kB
   AnonPages:       1023368 kB
   Mapped:           145832 kB
   Shmem:              7728 kB
   Slab:             111136 kB
   SReclaimable:      66316 kB
   SUnreclaim:        44820 kB
   KernelStack:        3824 kB
   PageTables:        27736 kB
   NFS_Unstable:          0 kB
   Bounce:                0 kB
   WritebackTmp:          0 kB
   CommitLimit:     9089696 kB
   Committed_AS:    2378396 kB
   VmallocTotal:   34359738367 kB
   VmallocUsed:      332928 kB
   VmallocChunk:   34359397884 kB
   HardwareCorrupted:     0 kB
   HugePages_Total:       0
   HugePages_Free:        0
   HugePages_Rsvd:        0
   HugePages_Surp:        0
   Hugepagesize:       2048 kB
   DirectMap4k:       67136 kB
   DirectMap2M:     4118528 kB
  
   CPU:total 8 (4 cores per cpu, 2 threads per core) family 6 model 26 stepping 5, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, ht
  
   Memory: 4k page, physical 4048200k(1230476k free), swap 7065596k(7065596k free)
  
   vm_info: OpenJDK 64-Bit Server VM (19.0-b09) for linux-amd64 JRE (1.6.0_20-b20), built on Dec 10 2010 19:45:55 by "buildd" with gcc 4.4.5
  
   time: Sat Jan  1 14:12:27 2011
   elapsed time: 0 seconds
  </code></pre>
  
  <p><br/>
  The java code is:</p>
  
  <pre><code>...
  public class Main {
  
      public static void main(String[] args) {
          ...
          ImageFile img = new ImageFile(System.getProperty("user.home") + "/PC100001.JPG");
          Exiv2MetaDataStore e = new Exiv2MetaDataStore(img);
          Iterator&lt;Entry&lt;String, String&gt;&gt; i = e.entrySet().iterator();
          while (i.hasNext()) {
              Entry&lt;String, String&gt; entry = i.next();
              System.out.println(entry.getKey() + ":" + entry.getValue());
          }
          //if you switch this print statment with the while loop you get the same error. 
          //System.out.print(e.toString()); 
      }
  }
  </code></pre>
  
  <p>and</p>
  
  <pre><code>/**NB: MetaDataStore is an abstract class that extends HashMap&lt;String,String&gt; */
  public class Exiv2MetaDataStore  extends MetaDataStore{
       ...
       private final ImageFile F;
       /**
        * Creates an meta data store from an ImageFile using Exiv2
        * this calls loadData();
        * @param f
        */
       public Exiv2MetaDataStore(ImageFile f) {
           F = f;
           loadData();
       }
       ...
       @Override
       protected void loadData() {
           loadFromExiv2();
       }
       ...     
       private void loadFromExiv2() {
           impl_loadFromExiv(F.getAbsolutePath(), this);
       }
       private native void impl_loadFromExiv(String path, Exiv2MetaDataStore str);
       //this method called by the C++ code
       public void exiv2_reciveElement(String key, String value) {
           super.put(key,value);
       }
       static {           
           Runtime.getRuntime().load("/home/hjed/libExiff2-binding.so");
       }
  
   }
  </code></pre>
  
  <p>C++ code:</p>
  
  <pre><code> #include &lt;exif.hpp&gt;
   #include &lt;image.hpp&gt;
   #include &lt;iptc.hpp&gt;
   #include &lt;exiv2/exiv2.hpp&gt;
   #include &lt;exiv2/error.hpp&gt;
   #include &lt;iostream&gt;
   #include &lt;iomanip&gt;
   #include &lt;cassert&gt;
  
   void loadIPTC(Exiv2::Image::AutoPtr  image, const char * path, JNIEnv * env, jobject obj) {
       Exiv2::IptcData &amp;iptcData = image-&gt;iptcData();
  
       //load method 
       jclass cls = env-&gt;GetObjectClass(obj);
       jmethodID mid = env-&gt;GetMethodID(cls, "exiv2_reciveElement", "(Ljava/lang/String;Ljava/lang/String;)V");
  
       //is there any IPTC data AND check that method exists
       if (iptcData.empty() || (mid == NULL)) {
           std::string error(path);
           error += ": failed loading IPTC data, there may not be any data";
       } else {
           Exiv2::IptcData::iterator end = iptcData.end();
           for (Exiv2::IptcData::iterator md = iptcData.begin(); md != end; ++md) {
               jvalue values[2];
               const char* key =  md-&gt;key().c_str();
               values[0].l = env-&gt;NewStringUTF(key);
               md-&gt;value().toString().c_str();
               const char* value = md-&gt;typeName();
               values[2].l = env-&gt;NewStringUTF(value);
               //If I replace the code for values[2] with the commented out code I get the same error.
               //const char* type = md-&gt;typeName();
               //values[2].l = env-&gt;NewStringUTF(type);
               env-&gt;CallVoidMethodA(obj, mid, values);
           }
       }
   }
  
   void getVars(const char* path, JNIEnv * env, jobject obj) {
       //Load image
       Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(path);
       assert(image.get() != 0);
       image-&gt;readMetadata();
       //Load IPTC data
       loadIPTC(image, path, env, obj);
  
   }
  
   JNIEXPORT void JNICALL Java_photo_exiv2_Exiv2MetaDataStore_impl_1loadFromExiv(JNIEnv * env, jobject obj, jstring path, jobject obj2) {
       const char* path2 = env-&gt;GetStringUTFChars(path, NULL);
       getVars(path2, env, obj);
       env-&gt;ReleaseStringUTFChars(path, path2);
   }
  </code></pre>
  
  <p>I've searched for a fix for this, but I can't find one. I don't have much experience using C++ so if I've made an obvious mistake in the C code I apologies.</p>
  
  <p>Thanks for any help,<br>
  HJED</p>
  
  <p>P.S. This is my first post on this site and I wasn't sure how much of the code I needed to show. Sorry if I've put to much up.</p>
  
  <p><strong>--------EDIT: Add gdm backtrack as suggested bellow-----------</strong><br>
  gdm backtrace at SIGSEGV:</p>
  
  <pre><code> #0  0x00007ffff6b0557f in JavaCallArguments::parameters() () from /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   #1  0x00007ffff6b0666b in JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*) () from /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   #2  0x00007ffff6b055c8 in JavaCalls::call(JavaValue*, methodHandle, JavaCallArguments*, Thread*) () from /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   #3  0x00007ffff6b111bd in jni_invoke_nonstatic(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, Thread*) ()
      from /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   #4  0x00007ffff6b2c5c7 in jni_CallVoidMethodA () from /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so
   #5  0x00007fffa77ccf16 in JNIEnv_::CallVoidMethodA (this=0x6131c8, obj=0x7ffff7fd3818, methodID=0x67e278, args=0x7ffff7fd3630) at /usr/lib/jvm/java-6-openjdk/include/jni.h:1063
   #6  0x00007fffa77ccb96 in loadIPTC (image=..., path=0x6ca640 "/home/hjed/PC100001.JPG", env=0x6131c8, obj=0x7ffff7fd3818) at src/main.cpp:36
   #7  0x00007fffa77ccd3f in getVars (path=0x6ca640 "/home/hjed/PC100001.JPG", env=0x6131c8, obj=0x7ffff7fd3818) at src/main.cpp:48
   #8  0x00007fffa77ccde7 in Java_photo_exiv2_Exiv2MetaDataStore_impl_1loadFromExiv (env=0x6131c8, obj=0x7ffff7fd3818, path=0x7ffff7fd3810, obj2=0x7ffff7fd3808) at src/main.cpp:54
   #9  0x00007ffff21d9cc8 in ?? ()
   #10 0x0000000000000000 in ?? ()
  </code></pre>
  
  <p>main.cpp:54 is:  </p>
  
  <pre><code>getVars(path2, env, obj);
  </code></pre>
  
  <p>main.cpp:48 is</p>
  
  <pre><code>loadIPTC(image, path, env, obj);
  </code></pre>
  
  <p>main.cpp:36 is</p>
  
  <pre><code>env-&gt;CallVoidMethodA(obj, mid, values);
  </code></pre>
  
  <p><strong>-------EDIT: Using -cacao. 5:15pm (AEDT) 1/1/11 ---------</strong></p>
  
  <p>I noticed looking at the stack traces above that the error was originating in librarys specific to the 'server' vm, so I tried the -cacao VM option.
  Instead of the jni crash I got a NullPointerException:</p>
  
  <pre><code> Exception in thread "main" java.lang.NullPointerException
      at test.Main.main(Main.java:29)
  </code></pre>
  
  <p>I added some debug code around where the exception was occuring (see bellow) and discovered that it was imposible for there to be a NullPointerException there.</p>
  
  <p>Modified code:</p>
  
  <pre><code>        while (i.hasNext()) {
               Entry&lt;String, String&gt; entry = i.next();
               if (entry == null) {
                   System.out.println("entry is null");
               } else if (entry.getKey() == null || entry.getValue() == null) {
                   System.out.println("Key and value are null");
               } else if (entry.getKey() == null) {
                   System.out.println("Key is null");
               } else if (entry.getValue() == null) {
                   System.out.println("Value is null");
               } else {
                   System.out.println(entry.getKey() + ":" + entry.getValue()); //This throws a NullPointerException.
               }
           }
  </code></pre>
  
  <p><br/>
  I thinks this is probably the same error, just handled a different way? Again thanks for any help.<br>
  <strong>EDIT: changed bit ORing to || as sugested by Favonius</strong></p>