When running hs :tier1 tests or jdk/jfr tests, with ubsan enabled (configure flag --enable-ubsan), in a lot of jfr related tests like compiler/intrinsics/klass/CastNullCheckDroppingsTest.jtr serviceability/jvmti/RedefineClasses/RedefineSharedClassJFR.jtr this oob error can be seen :
/jdk/src/hotspot/share/jfr/recorder/jfrEventSetting.inline.hpp:31:43: runtime error: index 163 out of bounds for type 'jfrNativeEventSetting [162]' #0 0x7f6b75a8634b in JfrEventSetting::setting(JfrEventId) /jdk/src/hotspot/share/jfr/recorder/jfrEventSetting.inline.hpp:31 #1 0x7f6b75a8634b in JfrEventSetting::set_stacktrace(long, bool) /jdk/src/hotspot/share/jfr/recorder/jfrEventSetting.cpp:47 Looks like the array in generated code is too small. With `jfrNativeEventSetting bits[NUMBER_OF_EVENTS];` and static const int NUMBER_OF_EVENTS = 162; static const int NUMBER_OF_RESERVED_EVENTS = 2; Access at index 163 cannot work. But it looks like there is always enough memory after the array so we do not crash and it was not noticed before. ------------- Commit messages: - JDK-8332699 Changes: https://git.openjdk.org/jdk/pull/19628/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19628&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8332699 Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/19628.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19628/head:pull/19628 PR: https://git.openjdk.org/jdk/pull/19628