简介（未完成）
什么是jvm crash
Symptoms include:
- webapps are completely unavailable.
- The Java process isn’t even running. It was not shut down manually.
-
Files with names like hs_err_pid20929.log being created in your app server’s bindirectory (wherever you start it from), containing text like:
# # An unexpected error has been detected by HotSpot Virtual Machine: # # SIGSEGV (0xb) at pc=0xfe9bb960, pid=20929, tid=17 # # Java VM: Java HotSpot(TM) Server VM (1.5.0_01-b08 mixed mode) # Problematic frame: # V [libjvm.so+0x1bb960] # --------------- T H R E A D --------------- Current thread (0x01a770e0): JavaThread "JiraQuartzScheduler_Worker-1" [_thread_in_vm, id=17] siginfo:si_signo=11, si_errno=0, si_code=1, si_addr=0x00000000 Registers: O0=0xf5999882 O1=0xf5999882 O2=0x00000000 O3=0x00000000 O4=0x00000000 O5=0x00000001 O6=0xc24ff0b0 O7=0x00008000 G1=0xfe9bb80c G2=0xf5999a48 G3=0x0a67677d G4=0xf5999882 G5=0xc24ff380 G6=0x00000000 G7=0xfdbc3800 Y=0x00000000 PC=0xfe9bb960 nPC=0xfe9bb964 .... this indicates Java is crashing.
The virtual machine is responsible for emulating a CPU, managing memory and devices, just like the operating system does for native applications (MS Office, web browsers etc).
A Java virtual machine crash is analogous to getting a Windows Blue Screen of Death when using MS Office or a web browser. jvm crash 就好比 windows 蓝屏
Troubleshoot System Crashes
A crash, or fatal error, causes a process to terminate abnormally. There are various possible reasons for a crash. For example, a crash can occur due to a bug in the Java HotSpot VM, in a system library, in a Java SE library or an API, in application native code, or even in the operating system (OS). External factors, such as resource exhaustion in the OS can also cause a crash.
Crashes caused by bugs in the Java HotSpot VM or in the Java SE library code are rare.