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Description
I was running performance analyses for the MMTk GCs and noticed the generational plans segfaulted somewhere in copy()
. GenImmix
always segfaults for luindex
while GenCopy
always segfaults for jython
.
Running the luindex
benchmark with GenImmix
under rr
tells me that the klass
variable here [1] is a nullptr
, hence the SIGSEGV. I haven't looked too deeply into it yet.
Commands Used
luindex
MMTK_PLAN=GenImmix ./build/linux-x86_64-normal-server-fastdebug/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -server -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Dprobes=RustMMTk -Djava.library.path=/home/kunals/git/evaluation/probes -Xms58M -Xmx58M -cp /usr/share/benchmarks/dacapo/dacapo-evaluation-git-f480064.jar:/home/kunals/git/evaluation/probes:/home/kunals/git/evaluation/probes/probes.jar Harness -c probe.DacapoChopinCallback -n 5 luindex
jython
MMTK_PLAN=GenCopy ./build/linux-x86_64-normal-server-release/jdk/bin/java -XX:MetaspaceSize=500M -XX:+DisableExplicitGC -server -XX:-TieredCompilation -Xcomp -XX:+UseThirdPartyHeap -Dprobes=RustMMTk -Djava.library.path=/home/kunals/git/evaluation/probes -Xms174M -Xmx174M -cp /usr/share/benchmarks/dacapo/dacapo-evaluation-git-f480064.jar:/home/kunals/git/evaluation/probes:/home/kunals/git/evalutation/probes/probes.jar Harness -c probe.DacapoChopinCallback -n 5 jython
Versions Used
mmtk-core revision: mmtk/mmtk-core@3dbdd7a
mmtk-openjdk revision: e6c9b94
openjdk revision: https://github.com/mmtk/openjdk/tree/jdk-11.0.15+8-mmtk
DaCapo Chopin revision: f480064
[1]: https://github.com/mmtk/mmtk-openjdk/blob/master/mmtk/src/abi.rs#L336
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