Stackoverflow exception has caused an exit value 1 when native thread is attaching as daemon. 

On AIX the default stack size of POSIX thread is 192 KB [https://www.ibm.com/docs/en/aix/7.1?topic=p-pthread-attr-getstacksize-subroutine ]. But in VM's thread creation logic, we set the default thread stack size to 2 MB [ https://github.com/openjdk/jdk/blob/master/src/hotspot/os_cpu/aix_ppc/globals_aix_ppc.hpp#LL33C64-L33C64 ] . So, in the absence of an explicit -Xss value the Java threads have 2M as the default stack size. 
 
This stack size is used by the function CallJavaMainInNewThread() to explicitly set the pthread attribute for stack size: https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjli/java_md.c#L671
 
But on this particular test we are not going through any particular JVM thread creation routines instead we are using a pthread_create() function which is defined in pthread library, hence we are getting 192 KB as default stack size which is default stack size of posix thread on AIX.
 

Log:

stdout: [Triggering a JNI warning
Native thread is running and attaching as daemon ...
];
 stderr: [ Test ERROR. Can't attach current thread: -1 ]
 exitValue = 1

java.lang.RuntimeException: Expected to get exit value of [0], exit value is: [1]`