[15] RFR(S): 8247967: SparkExamples24H.java SIGSEGV in various places

Markus Gronlund markus.gronlund at oracle.com
Tue Jun 23 22:56:00 UTC 2020

Thanks David!

Will remove the DEBUG_ONLY construct.


-----Original Message-----
From: David Holmes 
Sent: den 24 juni 2020 00:32
To: Markus Gronlund <markus.gronlund at oracle.com>; hotspot-runtime-dev at openjdk.java.net
Subject: Re: [15] RFR(S): 8247967: SparkExamples24H.java SIGSEGV in various places

H Markus,

On 24/06/2020 12:32 am, Markus Gronlund wrote:
> Greetings,
> Please review the following change set to correct the improper thread transition introduced as part of JDK-8245113.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8247967
> Webrev: http://cr.openjdk.java.net/~mgronlun/8247967/webrev00/
> Testing: jdk_jfr
> Thanks to David Holmes for pinpointing this embarrassing issue.

I'm glad to see a simple use of the existing transition helper was possible here. The fix looks good.

One minor note:

443       DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_native(thread));
  444       // can safepoint here
  445       ThreadInVMfromNative transition((JavaThread*)thread);

ThreadInVMfromNative will also assert that the thread is actually in native.


> Thanks
> Markus

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