That resulted in his onstage meltdown last year, which sent him to rehab and derailed the band's three-album release plans.

Armstrong told last week how he'd lost control of his personal circumstances and only vaguely remembered the moment during Green Day's set at the iHeartRadio Festival in LA.

Now Dirnt tells Rolling Stone of the experience: "It was very tense. They locked us in a room for about six hours. I won't say 'locked' � but I didn't want to hang out in the hallway with everybody's entourage. I felt like a rat in a cage.