Quoted from hotspot-compiler-dev@openjdk.java.net:

"Hello,

I’m posting this to the group since I can’t open a bug report against OpenJDK – I only have browsing privileges.

compilerDirectives.cpp is using the MT-Unsafe strtok function. This is causing some JVM crashes with our application under linux-x86_64 since some of our native code run via JNI is also using strtok. Fixing either our code or HotSpot to use strtok_r resolves the issue. We started seeing this problem after upgrading to OpenJDK 11 from Oracle JDK 8, which didn’t trigger any crashes.

Problematic lines:

https://hg.openjdk.java.net/jdk/jdk11/file/1ddf9a99e4ad/src/hotspot/share/compiler/compilerDirectives.cpp#l402

https://hg.openjdk.java.net/jdk/jdk11/file/1ddf9a99e4ad/src/hotspot/share/compiler/compilerDirectives.cpp#l407

Fixing this would make the compiler immune from other JNI code (or other JVM code) that could be using strtok.

The following details a survey of HotSpot that was done a long time ago to identify all occurrences of MT-unsafe functions:

https://bugs.openjdk.java.net/browse/JDK-4647546

I understand the latter goes beyond the scope of the compiler group.

Thanks,

Andre <Andre.Gillet@nuance.com>