Image.JPEG crashes with corrupt image

Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=3894

Reported by Thomas Bopp, Uni-GH Paderborn astra@upb.de

The crash only happens on the IA64 architecture (with redhat). We encountered it when moving to a new server. I have written a standalone test program which reproduces the crash. A single call causes only an error (invalid marker or something like that) and the second call crashes the program:

*** glibc detected *** double free or corruption (!prev): 0x6000000000245700 ***