The output of this program:

#include <stdio.h>

main()
{
  char buf[10] = {};
  int num;

  num = sscanf("012345", "%9[0-9]", buf);
  printf("num=%d, buf=\"%s\"\n", num, buf);
}

Should be:

num=1, buf="012345"

and indeed it is with glibc-2.1.2-11.  Unfortunately, with glibc-2.1.90-11,
the output is:

num=1, buf="0"

The attached patch fixes this problem.