RFR(S): 8198794: Hotspot crash on Cassandra 3.11.1 startup with libnuma 2.0.3 (original) (raw)

Gustavo Romero gromero at linux.vnet.ibm.com
Tue Mar 13 01:13:14 UTC 2018

Hi.

Paul, I just saw today your bug on JBS... https://bugs.openjdk.java.net/browse/JDK-8198794

Thanks for reporting and debugging it.

It looks like the issue boils down to the fact that although 'numa_all_nodes_ptr' was introduced with libnuma API v2, 'numa_nodes_ptr' was only introduced later on libnuma v2.0.9, so it's not present in libnuma 2.0.3 which dates back to Jun 2009 [1]. I agree with your initial patch that a reasonable way to address it for archs like x86_64 is to use 'numa_all_nodes_ptr' as a surrogate for 'numa_nodes_ptr' (PowerPC needs 'numa_nodes_ptr' anyway and will have to stick with libnuma 2.0.9 and above because it's not unusual to have non-configured nodes on PPC64 and nodes can be non-contiguous as well).

I just think it's better to handle it inside isnode_in_existing_nodes() interface, which is where such a information is needed in the end. In that sense, if you agree could you please check if the following webrev fixes the issue for you? It must also apply ok for jdk8u:

bug : https://bugs.openjdk.java.net/browse/JDK-8198794 webrev: http://cr.openjdk.java.net/~gromero/8198794/v1/

If it does solve your issue, I will kindly ask for another Reviewer.

Thank you.

Best regards, Gustavo

[1] http://cr.openjdk.java.net/~gromero/misc/numa_all_nodes_ptr_VS_numa_nodes_ptr.txt

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