RFR(S) 8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)

David Holmes david.holmes at oracle.com
Thu Aug 14 10:33:04 UTC 2014

On 14/08/2014 5:54 AM, Zhengyu Gu wrote:
> The crash is caused by debugee exiting process by calling ::exit(),
> which causes C runtime to destroy static object
> (VirtualMemoryTracker::_reserved_regions)  while threads still access it.

Non-trivial static C++ objects plus multi-threading just don't mix.

> The solution is to replace it with pointer type, allocates the object
> during NMT initialization and deallocate it during shutdown.

Looks okay to me.


> Bug: https://bugs.openjdk.java.net/browse/JDK-8054368
> Webrev: http://cr.openjdk.java.net/~zgu/8054368/webrev.00/
> <http://cr.openjdk.java.net/%7Ezgu/8054368/webrev.00/>
> Test:
>     Ran nsk/jdi/VirtualMachine/exit/exit002 in a loop for 1+ hour on
> Solaris x64, no crash.
>     Without the fix, it crashes within 5 minutes.
> Thanks,
> -Zhengyu

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