Re: Generational ZGC crashes on specbjbb

Liang Mao at
Mon Oct 31 03:35:13 UTC 2022

Hi Stefan and ZGC team,
I see crashes as well with early access build. The command line is
"java -XX:+UseZGC -Xmx8g -Xms8g -Xlog:gc* -XX:ParallelGCThreads=8 -XX:ConcGCThreads=2 -jar specjbb2015.jar -m COMPOSITE".
It works well in Intel sky-lake machines but consistently crashes in an Ice-lake architecture
"Intel(R) Xeon(R) Platinum 8369B CPU @ 2.90GHz" machine in 3 minutes. Hope this can help.
From:Stefan Karlsson <stefan.karlsson at>
Send Time:2022 Oct. 19 (Wed.) 19:44
To:"Kemper, William" <kemperw at>; zgc-dev at <zgc-dev at>
Subject:Re: Generational ZGC crashes on specbjbb
Thanks a lot!
 I'll see if I can figure out a way to reproduce this in-house. 
On 2022-10-18 23:39, Kemper, William wrote:
Filed: < > - Please let me know if you need anymore data. We're excited about Generational ZGC!
From: Stefan Karlsson <stefan.karlsson at> <mailto:stefan.karlsson at >
Sent: Tuesday, October 18, 2022 11:57:47 AM
To: Kemper, William; zgc-dev at <mailto:zgc-dev at >
Subject: RE: [EXTERNAL]Generational ZGC crashes on specbjbb 
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.
Thanks for reporting. If you file a JBS entry I'll figure out the best way to tag issues around Generational ZGC.
On 2022-10-18 20:20, Kemper, William wrote:
How do you want to handle error reports? I didn't see how to open an issue on GitHub. Should I open a ticket on JBS? Is there a label to distinguish ZGC generational from non-generational?
Thank you,
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