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fluent / sigdump

Use signal to show stacktrace of a Ruby process without restarting it
Apache License 2.0
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Show Java stacktrace in JRuby #7

Closed frsyuki closed 8 years ago

frsyuki commented 8 years ago

Java stacktrace includes extra useful information such as locked/waiting mutex objects (e.g. - waiting on org.jruby.RubyThread@544fe44c). This change shows Java stacktrace in addition to Ruby stacktrace.

dump_object_count is disabled because it causes undefined method exception.

Example:

  Thread #<Thread:0x6e1567f1> status=run priority=0
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:52:in `backtrace'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:52:in `dump_backtrace'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:34:in `dump_all_thread_backtrace'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:33:in `each'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:33:in `dump_all_thread_backtrace'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:16:in `dump'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:144:in `open'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:144:in `_open_dump_path'
      /Users/frsyuki/project/sigdump/lib/sigdump.rb:14:in `dump'
      -e:1:in `(root)'
    In Java "main" Id=1 RUNNABLE
        at sun.management.ThreadImpl.dumpThreads0(Native Method)
        at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:448)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:486)
        at org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:341)
        ...

  Thread #<Thread:0x2038ae61> status=sleep priority=0
      -e:1:in `sleep'
      -e:1:in `(root)'
    In Java "Ruby-0-Thread-7: -e:1" Id=18 TIMED_WAITING on org.jruby.RubyThread@2038ae61
        at java.lang.Object.wait(Native Method)
        -  waiting on org.jruby.RubyThread@2038ae61
        at org.jruby.RubyThread.sleep(RubyThread.java:1001)
        at org.jruby.RubyKernel.sleep(RubyKernel.java:803)
        at org.jruby.RubyKernel$INVOKER$s$0$1$sleep.call(RubyKernel$INVOKER$s$0$1$sleep.gen)
        at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:669)
        at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:206)
        at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:168)
        at ruby.__dash_e__.block_1$RUBY$__file__(-e:1)
        ...