Chris Cornell -- Burned On Music Video Set in Mock Hanging (PHOTOS)

Chris Cornell took a turn as a stuntman on his latest music video and it ended with the rocker suffering severe burns.

It went down while Cornell was shooting the video for "Nearly Forgot My Broken Heart." Production sources tell us the Soundgarden frontman insisted on doing his own stunts in the "Deadwood"-like video.

The big stunt ... a liquid chemical singeing a noose tied around his neck in a mock hanging (check 2:50 in the video).

It didn't go as planned and they were forced to do it several times ... with the chemicals eventually rubbing off on his neck and leaving the crooner with 2nd degree burns.

Don't worry groupies ... it didn't affect his gorgeous chiseled face.