When running with ubsan - enabled binaries on AIX , we see the following issue when running HS jtreg test gc/g1/humongousObjects/TestNoAllocationsInHRegions.java :

/srcdir/jdk/src/hotspot/share/gc/g1/g1Analytics.cpp:167:48: runtime error: division by zero
    #0 0x900000011daeb78 in G1Analytics::compute_pause_time_ratios(double, double) make/hotspot/src/hotspot/share/gc/g1/g1Analytics.cpp:167
    #1 0x900000011fe6cc8 in G1Policy::update_gc_pause_time_ratios(G1GCPauseType, double, double) make/hotspot/src/hotspot/share/gc/g1/g1Policy.cpp:1349
    #2 0x900000011fe6cc8 in G1Policy::record_pause(G1GCPauseType, double, double, bool) make/hotspot/src/hotspot/share/gc/g1/g1Policy.cpp:1369
    #3 0x900000011fe6cc8 in G1Policy::record_concurrent_mark_cleanup_end(bool) make/hotspot/src/hotspot/share/gc/g1/g1Policy.cpp:1328
    #4 0x900000011fe60a0 in G1ConcurrentMark::cleanup() make/hotspot/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp:1548
    #5 0x900000011fe5c5c in VM_G1PauseCleanup::work() make/hotspot/src/hotspot/share/gc/g1/g1VMOperations.cpp:172
    #6 0x900000011fd0148 in VM_G1PauseConcurrent::doit() make/hotspot/src/hotspot/share/gc/g1/g1VMOperations.cpp:150
    #7 0x9000000117c0598 in VM_Operation::evaluate() make/hotspot/src/hotspot/share/runtime/vmOperations.cpp:74
    #8 0x9000000117c0114 in VMThread::evaluate_operation(VM_Operation*) make/hotspot/src/hotspot/share/runtime/vmThread.cpp:282
    #9 0x9000000117bf788 in VMThread::inner_execute(VM_Operation*) make/hotspot/src/hotspot/share/runtime/vmThread.cpp:426
    #10 0x900000012c7d8f0 in VMThread::loop() make/hotspot/src/hotspot/share/runtime/vmThread.cpp:492
    #11 0x900000012c7d55c in VMThread::run() make/hotspot/src/hotspot/share/runtime/vmThread.cpp:176
    #12 0x9000000117a2d50 in Thread::call_run() make/hotspot/src/hotspot/share/runtime/thread.cpp:231
    #13 0x9000000117a1df8 in thread_native_entry(Thread*) make/hotspot/src/hotspot/os/aix/os_aix.cpp:683
    #14 0x900000000562048 (/usr/lib/libpthread.a+0x100004048)