RFR (trivial): 8250826: jhsdb does not work with coredump which comes from Substrate VM

[Yasumasa Suenaga]

Hi all,

Please review this trivial change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8250826
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8250826/webrev.00/

I played Truffle NFI on GraalVM, but I cannot get Java stacks from coredump via jhsdb.

I've reported this issue to GraalVM community [1], and I 've found out the cause of this issue is .svm_heap would be separated to RO and RW areas by mprotect() calls in run time in spite of .svm_heap is RO section in ELF (please see [1] for details).

It is corner case, but we will see same problem on jhsdb when we attempt to analyze coredump which comes from some applications / libraries which would separate RO sections in ELF like Substrate VM.

I sent PR to fix libsaproc.so in LabsJDK 11 for this issue [2], then community members suggested me to discuss in serviceability-dev.


Thanks,

Yasumasa


[1] https://github.com/oracle/graal/issues/2579
[2] https://github.com/graalvm/labs-openjdk-11/pull/9