Ping: Can I file it to JBS as new issue? Yasumasa 2016/01/30 23:08 "Yasumasa Suenaga" <yasue...@gmail.com>:
> Hi all, > > I want to check PerfCounter in core image to analyze state of crashed JVM. > When I use JSnap tool, I encountered NPE on Fedora 23 x86_64. > > I checked core image, and I found PerfMemory::_start, _top, etc are set to > NULL, > however, PerfMemory::_initialized is set to 1. > > PerfMemory::_start is set to NULL in PerfMemory::destroy(), and this > function > is called at before aborting VM. > > I fixed as below, and it works fine with JSnap: > ------------------- > diff -r edfc9e2316e3 src/share/vm/runtime/perfMemory.cpp > --- a/src/share/vm/runtime/perfMemory.cpp Sun Jan 24 23:20:12 2016 > +0900 > +++ b/src/share/vm/runtime/perfMemory.cpp Sat Jan 30 22:41:05 2016 > +0900 > @@ -196,12 +196,6 @@ > // > delete_memory_region(); > } > - > - _start = NULL; > - _end = NULL; > - _top = NULL; > - _prologue = NULL; > - _capacity = 0; > } > > // allocate an aligned block of memory from the PerfData memory > ------------------- > > I found JDK-6224040: enhance jstat to extract counter information from > core files . > At least, we can control shared memory through coredump_filter in modern > Linux kernel. > > Should I work this fix in JDK-6224040 ? or another issue ? > Please cooperate. > > > Thanks, > > Yasumasa > > >