8062870: src/share/vm/services/mallocTracker.hpp:64 assert(_count > 0) failed: Negative ,counter

[Coleen Phillimore]

Thanks Christian.  You took of RFR so I couldn't find it!
Coleen

On 11/10/14, 3:00 PM, Christian Tornqvist wrote:
> Hi Coleen,
>
> As mentioned offline, please make sure you remove the @ignore from
> test/runtime/NMT/MallocTrackingVerify.java as well.
>
> Otherwise this looks good, thanks for fixing this.
>
> Thanks,
> Christian
>
> -----Original Message-----
> From: hotspot-runtime-dev
> [mailto:hotspot-runtime-dev-bounces at openjdk.java.net] On Behalf Of Coleen
> Phillimore
> Sent: Monday, November 10, 2014 12:21 PM
> To: hotspot-runtime-dev
> Subject: RFR: 8062870: src/share/vm/services/mallocTracker.hpp:64
> assert(_count > 0) failed: Negative ,counter
>
> Summary: Signed bitfield size y can only have (1 << y)-1 values.
>
> We were overflowing the the _pos index and reusing the 0th element in the
> MallocSiteTable for two different stack traces which caused the assert for
> deallocation.
>
> Tested with nsk.quick.testlist and jtreg runtime tests with
> -XX:NativeMemoryTracking=detail.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/8062870/
> bug link https://bugs.openjdk.java.net/browse/JDK-8062870
>
> Thanks,
> Coleen
>