RFR(S) 8234429: appcds/dynamicArchive tests crashing with Graal
Calvin Cheung
calvin.cheung at oracle.com
Fri Nov 22 19:12:45 UTC 2019
Hi Ioi,
The fix looks good.
thanks,
Calvin
On 11/20/19 2:28 PM, Ioi Lam wrote:
> https://bugs.openjdk.java.net/browse/JDK-8234429
> http://cr.openjdk.java.net/~iklam/jdk14/8234429-dynamic-cds-graal-crash.v01/
>
>
> In JDK-8231610, the implementation of DynamicArchive::is_mapped() is
> changed to
>
> static bool is_mapped() { return FileMapInfo::dynamic_info() !=
> NULL; }
>
> During dynamic dumping, we temporarily (inside a safepoint) allocate a
> dynamic FileMapInfo, which makes it appear as if the dynamic archive
> has been mapped.
>
> When graal is enabled, the VM actually continues to run for a little
> (compiling Java methods) after dynamic dumping has finished. During
> this time, when JVMCI tries to resolves a class, it might try to look
> up from the dynamic archive, which will fail as the dynamic archive
> isn't really mapped.
>
> The fix is to free the temporarily allocated FileMapInfo when dynamic
> dumping is finished.
>
> Thanks
> - Ioi
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