RFR(S) 8244536 cds/DeterministicDump.java failed: File content different
Ioi Lam
ioi.lam at oracle.com
Mon May 11 21:00:59 UTC 2020
https://bugs.openjdk.java.net/browse/JDK-8244536
http://cr.openjdk.java.net/~iklam/jdk15/8244536-DeterministicDump-fails-on-windows.v01/
I fixed 2 issues that are likely to happen on Windows due to
it aggressive ASLR policy (address space layout randomization).
These would cause the CDS archive to have non-deterministic
contents:
[1] Don't save the _narrow_oop_{mode,shift,base} header fields
for platforms (including Windows) that don't support heap
archiving, as these fields would be useless anyway.
This was the cause of the failure cases in the bug report.
[2] Fixed a hashtable that would lay out differently if
the archive was relocated during -Xshare:dump. This is also
likely to happen on Windows but is not as frequent as #1.
Added test case for [2] in DeterministicDump.java (using
-XX:ArchiveRelocationMode=1).
Test on mach5 with tiers 1/2/3.
Thanks
- Ioi
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