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I got the following exception killing the JVM while using the M3 build on Netbeans 4.0b2. An unexpected exception has been detected in native code outside the VM. Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x3E4164 Function=JVM_OnLoad+0xFD4 Library=C:\DOCUME~1\jchristi\.netbeans\4.0beta2\modules\profiler-ea-libs\deployed\jdk142\windows\profilerinterface.dll Current Java thread: at com.sun.tools.profiler.server.system.Stacks.getMethodNamesForJMethodIds(Native Method) at com.sun.tools.profiler.server.ProfilerInterface.getMethodNamesForJMethodIds(ProfilerInterface.java:284) at com.sun.tools.profiler.server.ProfilerServer.handleClientCommand(ProfilerServer.java:548) at com.sun.tools.profiler.server.ProfilerServer.listenToClient(ProfilerServer.java:375) at com.sun.tools.profiler.server.ProfilerServer.run(ProfilerServer.java:242) Dynamic libraries: {SNIP SNIP} Heap at VM Abort: Heap def new generation total 3072K, used 278K [0x10010000, 0x10360000, 0x113c0000) eden space 2752K, 10% used [0x10010000, 0x10055990, 0x102c0000) from space 320K, 0% used [0x10310000, 0x10310000, 0x10360000) to space 320K, 0% used [0x102c0000, 0x102c0000, 0x10310000) tenured generation total 37084K, used 19619K [0x113c0000, 0x137f7000, 0x20010000) the space 37084K, 52% used [0x113c0000, 0x126e8d88, 0x126e8e00, 0x137f7000) compacting perm gen total 21248K, used 21165K [0x20010000, 0x214d0000, 0x24010000) the space 21248K, 99% used [0x20010000, 0x214bb728, 0x214bb800, 0x214d0000) Local Time = Fri Nov 05 19:42:44 2004 Elapsed Time = 6404 # # The exception above was detected in native code outside the VM # # Java VM: JFluid Client VM 1.4.3 (based on Java HotSpot(TM) VM) (1.4.2_04-b05-release mixed mode) #
Jon, a few questions to you: 1. How often does it happen? 2. By any chance, does the profiled application do any (intensive) class unloading? E.g. Tomcat may do that when it redeploys some application. You can check that by running the target JVM with "- verbose:class" option. There is a small chance that the failure may be due to attempting to get some info for a class that is already unloaded. 3. Traditionally, can you provide a test case? If item 2 above is not confirmed, then I suspect, there is a considerable chance that it's a yet another JVM defect that might be hard to fix. We have already fixed one problem that manifested itself in a very similar way, and probably had a root cause somewhere in the depth of the original HotSpot VM's GC code. Actually, we provided a workaround rather than a fix, but even that was difficult. So the decision on whether to spend time trying to fix this problem would depend on whether it's easy enough to reproduce and is really annoying...
Fairly certain no (intensive) class loading. Will investigate to make sure. Unfortunately this happens sporadically, and I will try to see if I can come up with a test case in the next few days.
Got this same crash tonight... still no additional info, but want to keep track of how many times I see this via a note in the issue.
I did note this was also spit out to stderr: *** JFluid warning: invalid jmethodID detected *** mId = 54006048, *mId = 53612992, standard_ptr_value = 136017176
Not positive because my profiling sessions usually last many hours and possibly days, but the occurrance of this error this past week seem to be when I connect to the JVM via Ctrl-Break. It seems as though when I use the "Connect at Startup" mechanism, that this error doesn't seem to happen. It could be just luck of the draw, but I will keep good track of how I connected for any further incidents of this... I haven't seen this the past few runs, but that is because I've been doing the majority of my profiling using the "Connect at Startup" mechanism.
Seems like when I connect via CTRL-BREAK, I'll get this error within a few hours. I currently have a profiling session that has been running for more than 90 hours, which I initiated via a "connect at startup", and never saw this happen.
*** Issue 51284 has been marked as a duplicate of this issue. ***
The root cause of this issue is very likely the fact that when a class gets unloaded, jmethodIds that could have previously been obtained for its methods, become invalid. If the tool keeps these jmethodIds and doesn't use them to obtain strings for class/method name before the class gets unloaded, it can crash the VM when it finally attempts to use jmethodIds that became invalid. I've just implemented a mechanism which keeps track of class unloading and forces the tool to obtain all information for classes about to be unloaded before they go away. Will send Jon a patch to see how this works for him.
changing owner to Misha
Just finally stopped profiling session that was up for 4 days, and it appears this fix worked. The following was sent to stdout (which I figures shows just how many times your new code has prevented the JVM from crashing) *** JFluid warning: invalid jmethodID detected *** mId = 49883280, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 158734304, *mId = 51560120, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 89690120, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 108126216, *mId = 2097189, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 199660032, *mId = 7471174, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48827792, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 90335944, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48546888, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 89853960, *mId = 48752688, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87971160, *mId = 88406520, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48348400, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 106739872, *mId = 50682864, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 101408736, *mId = 49941624, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 90607624, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 95813680, *mId = 46353792, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 51156368, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87967880, *mId = 87607864, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87971448, *mId = 87967880, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49346976, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 50304304, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 86828408, *mId = 7471174, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 90383408, *mId = 86509696, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 50165760, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 46236592, *mId = 106739552, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48518824, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87606536, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 102099816, *mId = 608559352, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 141002072, *mId = 0, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 158799216, *mId = 703688944, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 732453360, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 112246424, *mId = 2097189, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87971040, *mId = 103923720, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 86006784, *mId = 52268024, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49276560, *mId = 679005760, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 86827256, *mId = 86925056, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 106738896, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 52267200, *mId = 96470184, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 96472144, *mId = 49467440, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48425440, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 52400056, *mId = 102022632, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 103732000, *mId = 147505120, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 84041360, *mId = 136032660, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 103722288, *mId = 148307624, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49937896, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49740952, *mId = 157843376, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 174561704, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87411592, *mId = 107516528, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 102008576, *mId = 659397048, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49211168, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 46285816, *mId = 91333144, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 102010272, *mId = 136032660, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48740136, *mId = 0, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 99054552, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 147427272, *mId = 141067856, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 89621832, *mId = 83337496, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 49346832, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 102009376, *mId = 91088880, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 90467368, *mId = 140938064, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 86924912, *mId = 152174808, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 84590480, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 147580248, *mId = 3, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 136932192, *mId = 7471174, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 90565776, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 99373232, *mId = 99884816, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 99373144, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 46115616, *mId = 7471174, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 48411504, *mId = 99852168, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 87574976, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 169427880, *mId = 103914360, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 174562888, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID detected *** mId = 148381136, *mId = 6357072, standard_ptr_value = 136017176 *** JFluid warning: invalid jmethodID det
I meant stderr
Well, the above is a different issue, this fix (for what seems to be a bug in the JVM) existed before. But anyway, given that the problem didn't show up in 4 days, we can probably consider this issue fixed.
Got this while using patch jf-patch121404 on Netbeans 4.0 (real release): An unexpected exception has been detected in native code outside the VM. Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x26E61364 Function=Java_com_sun_tools_profiler_server_system_Stacks_getMethodNamesForJMethodIds+0xB4 Library=C:\Documents and Settings\jchristi\.netbeans\4.0\modules\profiler-ea-libs\deployed\jdk142\windows\profilerinterface.dll Current Java thread: at com.sun.tools.profiler.server.system.Stacks.getMethodNamesForJMethodIds(Native Method) at com.sun.tools.profiler.server.ProfilerInterface.getMethodNamesForJMethodIds(ProfilerInterface.java:291) at com.sun.tools.profiler.server.ProfilerServer.handleClientCommand(ProfilerServer.java:562) at com.sun.tools.profiler.server.ProfilerServer.listenToClient(ProfilerServer.java:376) at com.sun.tools.profiler.server.ProfilerServer.run(ProfilerServer.java:243)
It happened 4 hours into the profiling session, and both the target JVM and the Netbeans JVM seemed to be very unresponsive.... CPU was being highly consumed.
One more attempt to declare this issue fixed. This time I was able to reproduce it (though still not very reliably), found a real bug in the native code, and also introduced MS exception handler to protect the code from unknown problems. Jon, I can send you a hot fix to test if you would like.
Verification of old issues.
Closing old issues.
Reverting to the original Target Milestone value changed by mistake. Sorry for inconvenience.