Scaling a $9.5 Trillion Debt Wall

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All this is potentially bad news for a global economy that already appears to be losing momentum, especially because central bankers seem to be running out of ways to push investors into riskier securities. The default rate has already started ticking up as the bust in commodity prices forces companies to restructure or file for bankruptcy.

And it's not just oil drillers and miners that are struggling. Solera Holdings, the subject of one of last year's largest leveraged buyouts, is struggling to raise money in credit markets and has been forced to cut the amount of debt it plans to sell. Corus Entertainment pulled a C$300 million ($221.9 million) junk-bond offering backing a takeover because of difficult market conditions.

While the majority of debt that needs to be repaid is investment grade, it's unclear whether it'll remain so by the time it matures. In just eight weeks, credit investors have witnessed more fallen angels, or investment-grade companies getting downgraded to junk, than in any calendar year since 2009, Barclays analysts Jeffrey Meli and Bradley Rogoff wrote in a report on Friday.