On Tue, 26 Sep 2023 01:09:47 GMT, David Holmes <dhol...@openjdk.org> wrote:
>> Surely jstack thread dump and deadlock check _has_ to run at a safepoint? > > Also isn't "anonymous locking" an intermediate step in monitor inflation? The > inflated monitor becomes anonymously owned until the real owner sees it has > been inflated and updates the ownership accordingly. To expand if deadlock detection does not run at a safepoint then this logic is non-atomic and completely broken: threads = VM.getVM().getThreads(); heap = VM.getVM().getObjectHeap(); createThreadTable(); // calls getThreads() again Without a stable VM you could have three almost completely different set of threads when each of these statements run! ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/15907#discussion_r1336523076
