After the last time to call scan_task.scan_func()，the should be ended, this means PipelineFragmentContext could be released.
Then after PipelineFragmentContext is released, visiting its field such as query_ctx or _state may cause core dump.
But it can only explain core 2
void ScannerScheduler::_task_group_scanner_scan(ScannerScheduler* scheduler,
taskgroup::ScanTaskTaskGroupQueue* scan_queue) {
while (!_is_closed) {
taskgroup::ScanTask scan_task;
auto success = scan_queue->take(&scan_task);
if (success) {
int64_t time_spent = 0;
{
SCOPED_RAW_TIMER(&time_spent);
scan_task.scan_func();
}
scan_queue->update_statistics(scan_task, time_spent);
}
}
}
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