Comment 2 for bug 982675

StacktraceTop:
 __libc_message (do_abort=2, fmt=0x7f509e6cd0d0 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
 malloc_printerr (action=3, str=0x7f509e6cd208 "free(): invalid next size (normal)", ptr=<optimized out>) at malloc.c:5007
 _IO_vfscanf_internal (s=<optimized out>, format=<optimized out>, argptr=0x7fff072e2168, errp=0x0) at vfscanf.c:2938
 _IO_vsscanf (string=0x7fff072e67a0 "4800CQ", format=0x7f509f1c168b "%dx%d", args=0x7fff072e2168) at iovsscanf.c:45
 __sscanf (s=<optimized out>, format=<optimized out>) at sscanf.c:34