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Welcome to the Tsan Project!

The goal of this Project is to explore and incubate a Thread SANitizing (TSAN) feature that could be integrated into the HotSpot JVM and the JVM Tool Interface (JVM TI).  This includes working, evaluating, and incubating a Thread Sanitizer implementation for Java.

The rest of this page will provide basic information for downloading, building, and testing Java TSAN.

Note: Java TSAN is not working yet and will not be able to provide any data race information yet. The information below is really how to clone/test for developers and testers:

Cloning:

hg clone --branch tsan http://hg.openjdk.java.net/tsan/dev jdk-tsan

Installing:

TODO: since TSAN is not even integrated yet, the JDK you just branched is the mainline.

Running:

Note: the method of including the TSAN runtime in the JVM is not finalized and will definitely change in the future.

First ensure you have libtsan.so available. e.g.:

sudo apt install libgcc-8-dev

ls -l /usr/lib/gcc/x86_64-linux-gnu/8/libtsan.so

Run Java with TSAN enabled:

LD_PRELOAD=/usr/lib/gcc/x86_64-linux-gnu/8/libtsan.so ./images/jdk/bin/java -XX:+ThreadSanitizer

Testing:Currently

, the The tests for TSAN are here:at test/hotspot/jtreg/tsan/

make test doesn't work since it doesn't support LD_PRELOAD. Instead, run:

make jdk-image test-image
JTREG=path/to/jtreg
JDK_ROOT=path/to/tsan_jdk
$JTREG -e:LD_PRELOAD=/usr/lib/gcc/x86_64-linux-gnu/8/libtsan.so -jdk:$JDK_ROOT/build/images/jdk/ -nativepath:$JDK_ROOT/build/images/test/hotspot/jtreg/native/ -e:TSAN_OPTIONS=suppressions=$JDK_ROOT/bin/tsan.supp $JDK_ROOT/make run-test  TEST="jtreg:test/hotspot/jtreg/tsan"/

where $JDK_ROOT must be an absolute path because -nativepath only works with an absolute pathThe tests are currently passing if TSAN is not enabled; once TSAN starts coming online, the tests will flip their assertions/expectations.

Resources

• Tsan Project
• Repositories
• Mailing list: tsan-dev