GREEN DAY singer BILLIE JOE ARMSTRONG talks about his substance abuse problems in the new issue of Rolling Stone.  He says he'd regularly get so wasted that he'd BLACKOUT.  Billie says, "I couldn't predict where I was going to end up at the end of the night.  I'd wake up in a strange house on a couch.  I wouldn't remember how.  It was a complete blackout."

He finally went to rehab after his wild onstage MELTDOWN tantrum at the iHeartRadio festival last September. . . and no, he doesn't remember much from that night either.

He says, ". . . the next morning, I woke up.  I asked [my wife] Adrienne, 'How bad was it?'  She said, 'It's bad.'  I called my manager.  He said, 'You're getting on a plane . . . and going into rehab immediately.'"

If you wanna read more of what Billie Joe does or doesn’t remember the new issue of Rolling Stone hits the rack on Friday