我们有一个Java应用程序,它具有一个JNI层,该层是多线程的(pthread),并且在从底层网络接收到消息时将回调到Java级别。
我们注意到每次崩溃都是由gc引起的。我们甚至可以通过在JNI层从网络接收消息时手动触发gc来模拟这样的崩溃。
鉴于我们在此帖子https://dev59.com/L5rga4cB1Zd3GeqPo5M4#39401467中阅读到的有关JVM在GC期间行为的信息,我们仍然无法弄清楚为什么此类崩溃与gc有关,因为在gc期间会阻止JNI函数调用。
如果有人能够解释一下,那就太好了。谢谢提前。
以下是我们在应用程序崩溃后收集的堆栈跟踪。
我们获取JNIEnv*的方式
我们注意到每次崩溃都是由gc引起的。我们甚至可以通过在JNI层从网络接收消息时手动触发gc来模拟这样的崩溃。
鉴于我们在此帖子https://dev59.com/L5rga4cB1Zd3GeqPo5M4#39401467中阅读到的有关JVM在GC期间行为的信息,我们仍然无法弄清楚为什么此类崩溃与gc有关,因为在gc期间会阻止JNI函数调用。
如果有人能够解释一下,那就太好了。谢谢提前。
以下是我们在应用程序崩溃后收集的堆栈跟踪。
Program terminated with signal 6, Aborted.
#0 0x0000003cdce325e5 in raise () from /lib64/libc.so.6
#1 0x0000003cdce33dc5 in abort () from /lib64/libc.so.6
#2 0x00007fdafe2516b5 in os::abort(bool) () from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#3 0x00007fdafe3efbf3 in VMError::report_and_die() ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#4 0x00007fdafde2f3e2 in report_vm_error(char const*, int, char const*, char const*) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#5 0x00007fdafe24c1ff in os::PlatformEvent::park() ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#6 0x00007fdafe20c538 in Monitor::ILock(Thread*) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#7 0x00007fdafe20c73f in Monitor::lock_without_safepoint_check() ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#8 0x00007fdafe2e7a1f in SafepointSynchronize::block(JavaThread*) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#9 0x00007fdafe39bcdd in JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread*) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#10 0x00007fdafe0123d8 in jni_NewByteArray ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#11 0x00007fdaa447b7d1 in JNIEnv_::NewByteArray (this=0x7fdaf800c9f8, len=7)
at /usr/java/jdk1.8.0_65/include/jni.h:1643
---omitted---
#19 0x0000003cdd20b68c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#20 0x00007fdafe24c133 in os::PlatformEvent::park() ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#21 0x00007fdafe20ce27 in Monitor::IWait(Thread*, long) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#22 0x00007fdafe20d5f0 in Monitor::wait(bool, long, bool) ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
---Type <return> to continue, or q <return> to quit---
#23 0x00007fdafe39ed51 in Threads::destroy_vm() ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#24 0x00007fdafdfff931 in jni_DestroyJavaVM ()
from /usr/java/jdk1.8.0_65/jre/lib/amd64/server/libjvm.so
#25 0x00007fdafe91a63d in JavaMain () from /usr/java/jdk1.8.0_65/bin/../lib/amd64/jli/libjli.so
#26 0x0000003cdd207aa1 in start_thread () from /lib64/libpthread.so.0
#27 0x0000003cdcee8aad in clone () from /lib64/libc.so.6
我们获取JNIEnv*的方式
JNIEnv *env = 0;
jint result = jvm->GetEnv((void **) &env, JNI_VERSION_1_8);
if (result != JNI_OK) {
result = jvm->AttachCurrentThread((void **) &env, NULL);