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JVM 在类加载期间在 memcpy 时崩溃

java jvm jvm-crash
2022-09-03 16:49:13

我的JVM崩溃了，hs_err文件显示它在尝试加载类时崩溃了。特别是在尝试memcpy（[libc.so.6 + 0x6aa2c] memcpy + 0x1c）时。我查看了.class文件，并能够确定正在加载的类。

但是，任何人都可以告诉我是什么原因导致这种情况，或者我如何确定更多关于原因的信息吗？如果 JVM 内存不足，它不会引发错误。任何见解都非常感谢。

我从hs_err文件中摘录了一段。

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  SIGBUS (0x7) at pc=0x005aba2c, pid=20841, tid=2427227056
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0_02-b05 mixed mode)
# Problematic frame:
# C  [libc.so.6+0x6aa2c]  memcpy+0x1c
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#

---------------  T H R E A D  ---------------

Current thread (0x90d0dc00):  JavaThread "ORDERHANDLER" [_thread_in_native, id=20881]

siginfo:si_signo=7, si_errno=0, si_code=2, si_addr=0x915e3000

Registers:
EAX=0x91218298, EBX=0xb7f2e71c, ECX=0x0000079b, EDX=0x915dfef2
ESP=0x90ac6a34, EBP=0x90ac6a60, ESI=0x915e2ffd, EDI=0x914f0a0d
EIP=0x005aba2c, CR2=0x915e3000, EFLAGS=0x00010206

Top of Stack: (sp=0x90ac6a34)
0x90ac6a34:   b7f29d4b 914ed930 915dff20 00004f49
0x90ac6a44:   082e7bc4 00006f6f 00004243 00004f49
0x90ac6a54:   b7f2e71c 080e3e54 00000000 90ac6a90
0x90ac6a64:   b7f29fbb 080e3b00 080e3e54 00000000
0x90ac6a74:   00000000 90d0dc00 00000000 d68dd1b6
0x90ac6a84:   b7f2e71c 90ac6ad8 90d0dcec 90ac6f00
0x90ac6a94:   b7f21169 080e3b00 90ac6ad8 0000002b
0x90ac6aa4:   0000002b 90ac6ad8 00000008 00000000

Instructions: (pc=0x005aba2c)
0x005aba1c:   8b 74 24 08 fc d1 e9 73 01 a4 d1 e9 73 02 66 a5
0x005aba2c:   f3 a5 89 c7 89 d6 8b 44 24 04 c3 90 90 90 90 90

Stack: [0x90a78000,0x90ac9000),  sp=0x90ac6a34,  free space=314k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [libc.so.6+0x6aa2c]  memcpy+0x1c
C  [libzip.so+0xbfbb]  ZIP_GetEntry+0x10b
C  [libzip.so+0x3169]  Java_java_util_zip_ZipFile_getEntry+0xc9
J  java.util.zip.ZipFile.getEntry(JLjava/lang/String;Z)J
J  java.util.zip.ZipFile.getEntry(Ljava/lang/String;)Ljava/util/zip/ZipEntry;
J  java.util.jar.JarFile.getEntry(Ljava/lang/String;)Ljava/util/zip/ZipEntry;
J  sun.misc.URLClassPath$JarLoader.getResource(Ljava/lang/String;Z)Lsun/misc/Resource;
J  sun.misc.URLClassPath.getResource(Ljava/lang/String;Z)Lsun/misc/Resource;
J  java.net.URLClassLoader$1.run()Ljava/lang/Object;
v  ~StubRoutines::call_stub
V  [libjvm.so+0x20bbbd]
V  [libjvm.so+0x30a6b8]
V  [libjvm.so+0x20ba50]
V  [libjvm.so+0x26190b]
C  [libjava.so+0xaa5c]  Java_java_security_AccessController_doPrivileged__Ljava_security_PrivilegedExceptionAction_2Ljava_security_AccessControlContext_2+0x3
c
J  java.security.AccessController.doPrivileged(Ljava/security/PrivilegedExceptionAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;
J  java.net.URLClassLoader.findClass(Ljava/lang/String;)Ljava/lang/Class;
J  java.lang.ClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;
J  sun.misc.Launcher$AppClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;
j  java.lang.ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class;+3
j  java.lang.ClassLoader.loadClassInternal(Ljava/lang/String;)Ljava/lang/Class;+2
v  ~StubRoutines::call_stub
V  [libjvm.so+0x20bbbd]
V  [libjvm.so+0x30a6b8]
V  [libjvm.so+0x20b6e1]
V  [libjvm.so+0x20b7ca]
V  [libjvm.so+0x367621]
V  [libjvm.so+0x3662a5]
V  [libjvm.so+0x365357]
V  [libjvm.so+0x365112]
V  [libjvm.so+0x1adb03]
V  [libjvm.so+0x1aeb32]
V  [libjvm.so+0x2d75cb]
V  [libjvm.so+0x2d8a94]
V  [libjvm.so+0x2d8a17]
V  [libjvm.so+0x1fe7f8]
j  com.aqua.foms.book.OrderHandler.handleNewOrder(Lcom/aqua/NmsApi/OrderMap;Lcom/aqua/api/AtsMessage;)V+221
j  com.aqua.foms.book.FMSNewOrderTask.execute()V+12
j  com.aqua.api.EEDefaultWorkerThread.run()V+96
v  ~StubRoutines::call_stub
V  [libjvm.so+0x20bbbd]
V  [libjvm.so+0x30a6b8]
V  [libjvm.so+0x20b4d0]
V  [libjvm.so+0x20b55d]
V  [libjvm.so+0x27b795]
V  [libjvm.so+0x383ef0]
V  [libjvm.so+0x30b5a9]
C  [libpthread.so.0+0x5371]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J  java.util.zip.ZipFile.getEntry(JLjava/lang/String;Z)J
J  java.util.zip.ZipFile.getEntry(Ljava/lang/String;)Ljava/util/zip/ZipEntry;
J  java.util.jar.JarFile.getEntry(Ljava/lang/String;)Ljava/util/zip/ZipEntry;
J  sun.misc.URLClassPath$JarLoader.getResource(Ljava/lang/String;Z)Lsun/misc/Resource;
J  sun.misc.URLClassPath.getResource(Ljava/lang/String;Z)Lsun/misc/Resource;
J  java.net.URLClassLoader$1.run()Ljava/lang/Object;
v  ~StubRoutines::call_stub
J  java.security.AccessController.doPrivileged(Ljava/security/PrivilegedExceptionAction;Ljava/security/AccessControlContext;)Ljava/lang/Object;
J  java.net.URLClassLoader.findClass(Ljava/lang/String;)Ljava/lang/Class;
J  java.lang.ClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;
J  sun.misc.Launcher$AppClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class;
j  java.lang.ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class;+3
j  java.lang.ClassLoader.loadClassInternal(Ljava/lang/String;)Ljava/lang/Class;+2
v  ~StubRoutines::call_stub
j  com.aqua.foms.book.OrderHandler.handleNewOrder(Lcom/aqua/NmsApi/OrderMap;Lcom/aqua/api/AtsMessage;)V+221
j  com.aqua.foms.book.FMSNewOrderTask.execute()V+12
j  com.aqua.api.EEDefaultWorkerThread.run()V+96
v  ~StubRoutines::call_stub

---------------  P R O C E S S  ---------------

Java Threads: ( => current thread )
  0x080c9c00 JavaThread "pool-1-thread-3" [_thread_blocked, id=18725]
  0x0824f800 JavaThread "pool-1-thread-2" [_thread_blocked, id=13693]
  0x91217c00 JavaThread "AquaSchedulerService_7" daemon [_thread_blocked, id=23675]
  0x91215c00 JavaThread "AquaSchedulerService_6" daemon [_thread_blocked, id=23001]
 0x91215400 JavaThread "AquaSchedulerService_5" daemon [_thread_blocked, id=22759]
  0x91213400 JavaThread "AquaSchedulerService_4" daemon [_thread_blocked, id=22410]
  0x91212c00 JavaThread "AquaSchedulerService_3" daemon [_thread_blocked, id=22262]
  0x08316400 JavaThread "pool-1-thread-1" [_thread_blocked, id=22260]
  0x0827d000 JavaThread "JmsConn_1_sender_0" daemon [_thread_blocked, id=21196]
  0x90d0cc00 JavaThread "Timer-0" [_thread_blocked, id=20882]
=>0x90d0dc00 JavaThread "ORDERHANDLER" [_thread_in_native, id=20881]
  0x90d0d400 JavaThread "TradeInviteMonitor" [_thread_blocked, id=20880]
  0x90d09c00 JavaThread "ROUTERT" [_thread_blocked, id=20878]
  0x90d09000 JavaThread "TIBCO EMS Session Dispatcher (33197)" [_thread_blocked, id=20877]
  0x08310800 JavaThread "DORDERHANDLER" [_thread_blocked, id=20874]
  0x90d01c00 JavaThread "Thread-12" daemon [_thread_blocked, id=20873]
  0x90d03000 JavaThread "Thread-11" daemon [_thread_in_native, id=20872]
  0x082e1c00 JavaThread "DELAYEDORDMON" [_thread_blocked, id=20871]
  0x082e8000 JavaThread "DBUPD" [_thread_blocked, id=20870]
  0x914e5000 JavaThread "pool-2-thread-1" [_thread_blocked, id=20869]
  0x914e3c00 JavaThread "StatusStatsEventDispatcherThread" [_thread_blocked, id=20868]
  0x082c8400 JavaThread "TimerQueue" daemon [_thread_blocked, id=20866]
  0x082ca000 JavaThread "MDATATHREAD" [_thread_blocked, id=20865]
  0x082c9400 JavaThread "AquaSchedulerService_2" daemon [_thread_blocked, id=20864]
  0x9122b000 JavaThread "DestroyJavaVM" [_thread_blocked, id=20843]
  0x91200800 JavaThread "FirmMatchingServer" [_thread_blocked, id=20863]
  0x914de800 JavaThread "TIBCO EMS TCPLink Reader (32084)" daemon [_thread_in_native, id=20861]
  0x9122a400 JavaThread "TIBCO EMS Connections Pinger" daemon [_thread_blocked, id=20859]
  0x914d4000 JavaThread "WDISTQ" [_thread_blocked, id=20858]
  0x9121f400 JavaThread "JmsConn_1_connector_0" daemon [_thread_blocked, id=20857]
  0x914d8000 JavaThread "JmsConn_1_receiver_0" daemon [_thread_blocked, id=20856]
  0x9149ac00 JavaThread "AquaSchedulerService_1" daemon [_thread_blocked, id=20855]
  0x9149b400 JavaThread "AquaSchedulerService_0" daemon [_thread_blocked, id=20854]
  0x9142a000 JavaThread "MySQL Statement Cancellation Timer" daemon [_thread_blocked, id=20852]
  0x91425c00 JavaThread "Dispatcher-Thread-0" daemon [_thread_blocked, id=20851]
  0x080bf800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=20849]
  0x080bdc00 JavaThread "CompilerThread0" daemon [_thread_blocked, id=20848]
  0x080bcc00 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=20847]
  0x080a9800 JavaThread "Finalizer" daemon [_thread_blocked, id=20846]
  0x080a8800 JavaThread "Reference Handler" daemon [_thread_blocked, id=20845]

Other Threads:
  0x080a5400 VMThread [id=20844]
  0x080c1000 WatcherThread [id=20850]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

答案 1

我们看到了类似的错误。我们当前的嫌疑人是jar文件，它们在进程运行时（通过升级进程）重写。


答案 2

答案 1 是正确的。java.util..zip.* 的实现有问题。

如果替换 Java 程序当前已“打开”的 zip/jar 文件（已缓存 ZipFile/JarFile 对象），它将使用从原始文件读取的缓存目录 （TOC） 数据，并尝试使用它来解压缩被替换文件中的数据。通货膨胀代码并不健壮，当出现不良数据时，它会完全崩溃。

普通的unix程序在使用它们时保持文件打开。如果覆盖该文件，则使用它的程序仍可以通过打开的文件描述符访问它打开的原始文件。

OpenJDK 的 java.util.zip.* 实现选择不为 zip/jar 文件保留文件描述符。其中一个原因可能是Java经常被类路径中的数百个jar文件调用，并且设计人员不想仅在jar文件上用完数百个文件描述符，而将程序本身留给程序本身。因此，一旦他们读取了jar/zip目录，他们就会关闭文件描述符，如果原始jar/zip文件的内容发生变化，他们将永久失去对原始jar/zip文件的访问权限。

无论出于何种原因，ZipFile都不会或无法判断zip/jar文件已更改。如果是这样，它可能会重新读取目录或抛出某种错误（如果不可能）。

此外，即使TOC仍然有效，膨胀机也会在错误数据上崩溃。如果 ZIP 目录有效，但膨胀的数据流故意出错，该怎么办？

下面是一个测试程序，证明 java.util.zip.* 不会为 zip/jar 文件打开文件描述符，也不会检测到 zip 文件已更改。

import java.util.zip.*;
import java.io.*;

public class ZipCrashTest {
    public static void main(String args[]) throws Exception {
        // create some test data
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 100000; i++) sb.append("Hello, World\n");
        final byte[] data = sb.toString().getBytes();

        // create a zip file
        try (ZipOutputStream zo = new ZipOutputStream(new FileOutputStream("test1.zip"))) {
            zo.putNextEntry(new ZipEntry("world.txt")); zo.write(data, 0, data.length); zo.closeEntry();
            zo.putNextEntry(new ZipEntry("hello.txt")); zo.write(data, 0, data.length); zo.closeEntry();
        }

        // create a second valid zip file, but with different contents
        try (ZipOutputStream zo = new ZipOutputStream(new FileOutputStream("test2.zip"))) {
            zo.putNextEntry(new ZipEntry("hello.txt")); zo.write(data, 0, data.length); zo.closeEntry();
            zo.putNextEntry(new ZipEntry("world.txt")); zo.write(data, 0, data.length); zo.closeEntry();
        }

        // open the zip file
        final ZipFile zf = new ZipFile("test1.zip");

        // read the first file from it
        try (InputStream is = zf.getInputStream(zf.getEntry("hello.txt"))) {
            while (is.read() != -1) { /* do nothing with the data */ }
        }

        // replace the contents of test1.zip with the different-but-still-valid test2.zip
        Runtime.getRuntime().exec("cp test2.zip test1.zip");

        // read another entry from test1.zip: it does not detect that the file has changed.
        // the program will crash here
        try (InputStream is = zf.getInputStream(zf.getEntry("world.txt"))) {
            while (is.read() != -1) { /* do nothing */ }
        }
    }
}

运行此程序应该会给您带来JVM崩溃：

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGBUS (0x7) at pc=0x00007fb0fbbeef72, pid=4140, tid=140398238095104
...
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [libzip.so+0x4f72]  Java_java_util_zip_ZipFile_getZipMessage+0x1132
C  [libzip.so+0x5d7f]  ZIP_GetEntry+0xcf
C  [libzip.so+0x3904]  Java_java_util_zip_ZipFile_getEntry+0xb4
j  java.util.zip.ZipFile.getEntry(J[BZ)J+0
j  java.util.zip.ZipFile.getEntry(Ljava/lang/String;)Ljava/util/zip/ZipEntry;+38
j  ZipCrashTest.main([Ljava/lang/String;)V+476

针对JVM提交的主要错误是JDK-4425695：更新jar文件导致运行程序崩溃。

RFE 6929479：添加系统属性 sun.zip.disableMemoryMapping 以禁用 ZipFile 中的 mmap 使用在 JDK7 中实现系统属性 - - 您可以将其用作解决方法。sun.zip.disableMemoryMapping


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