On Thu, 24 Jul 2025 12:31:04 GMT, David Holmes <dhol...@openjdk.org> wrote:
>> The java_thread can be null because the carrier of a mounted vthread was not >> contained in the ThreadsListHandle. >> >> The only thing this function guarantees is that if the vthread appeared to >> have a carrier and that carrier is protected by the TLH, then the caller can >> safely interact with the carrier knowing it can't terminate - same as for >> regular threads. The caller has to account for the potential async >> mounting/unmounting of vthread - e.g. by handshaking the reported carrier >> and then confirming it is still the carrier. > > Note that `java_thread` may already be null so we don't get to execute line > 836. Thanks, David. The potential issue I'm still concerned about is that a subsequent handshaking can observe the JavaThread (and virtual thread as well) in a VTMS transition when there is no protection with a `VTMSTransitionDisabler`. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/26287#discussion_r2228896900
