RFR(XS): 8212883: Setting a double manageable flag with jcmd/jinfo crashes the JVM

David Holmes david.holmes at oracle.com
Tue Oct 23 23:15:58 UTC 2018

Hi Tony,

On 24/10/2018 8:13 AM, Tony Printezis wrote:
> Webrev here:
> http://cr.openjdk.java.net/~tonyp/8212883/webrev.0/
> Currently, HotSpot doesn’t actually have any double manageable flags, which
> is why I think no-one has hit this before. I recently added a couple to our
> own builds and I noticed that setting them is not handled correctly in the VM.
> The fix is pretty trivial (mostly cut-and-paste from what the code does for
> the other types).

I agree the fix is pretty obvious and straight-forward.

> I tested it by introducing a dummy double manageable flag and I can set it
> with jinfo/jcmd and jconsole (these cover all the various paths in the
> changes). Is it worth expanding the
> serviceability/attach/AttachSetGetFlag.java test to also get/set a double
> flag (I’d need to introduce a dummy double manageable flag to do that
> though)?

I hate to see new code untested ... but then it seems we don't have 
tests for all the existing types of flags anyway.



> Regards,
> Tony
> —————
> Tony Printezis | @TonyPrintezis | tprintezis at twitter.com

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