According to Billboard, Mayhem Festival co-founder John Reese’s Synergy Global Entertainment has filed for Chapter 7 bankruptcy protection in the U.S. Bankruptcy Court in California’s Central District. The promotion company, which was behind Ozzfest Meets Knotfest, MUSINK Festival, etc., currently “owes $8.4 million to its creditors, according to the filing, and has about $1 million…