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8358645: Access violation in ThreadsSMRSupport::print_info_on during thread dump

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Reviewed-by: fbredberg, shade, dcubed
This commit is contained in:
David Holmes 2025-06-26 21:48:46 +00:00
parent 20e0055e20
commit 334683e634
1 changed files with 4 additions and 3 deletions
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7
src/hotspot/share/runtime/threadSMR.cpp
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@ -1168,9 +1168,10 @@ void ThreadsSMRSupport::print_info_on(const Thread* thread, outputStream* st) {
// The count is only interesting if we have a _threads_list_ptr.
st->print(", _nested_threads_hazard_ptr_cnt=%u", thread->_nested_threads_hazard_ptr_cnt);
}
if (SafepointSynchronize::is_at_safepoint() || Thread::current() == thread) {
// It is only safe to walk the list if we're at a safepoint or the
// calling thread is walking its own list.
if ((SafepointSynchronize::is_at_safepoint() && thread->is_Java_thread()) ||
Thread::current() == thread) {
// It is only safe to walk the list if we're at a safepoint and processing a JavaThread,
// or the calling thread is walking its own list.
SafeThreadsListPtr* current = thread->_threads_list_ptr;
if (current != nullptr) {
// Skip the top nesting level as it is always printed above.