A global sell-off in ai and chip stocks has led to a drop in the VanEck Semiconductor ETF, which is testing support levels after weeks of losses. The sell-off has affected various chipmaker stocks, with some experiencing significant declines, although there are indications that some market futures are rising after the sell-off. The situation appears to be impacting multiple markets, including those in the US and Asia, with various factors potentially contributing to the decline, including concerns about ai spending and earnings reports from key companies.