'as' fails on inline assembly

There was a problem in GCC when I added some inline assembly.

as: BFD (GNU Binutils for Ubuntu) 2.22 assertion fail ../../bfd/elf.c:6715
as: BFD (GNU Binutils for Ubuntu) 2.22 internal error, aborting at ../../bfd/elfcode.h line 229 in bfd_elf32_swap_symbol_out

as: Please report this bug.

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inline assembly:

__asm__(
                "movl $(%ebx+4), %eax;" /* getting the operand in %eax */
                "movl $0, %ebx;" /* ebx is the counter iand initializing it */
        "_start:"
                "cmpl $0, %eax;"
                "jz _final ;" /* if the comparison is 0 then jump to _final label */
                "movl %eax, %ecx;"
                "andl $1, %ecx;"
                "cmpl $0, %ecx;"
                "jz _skipadd;"
                "addl $1, %ebx;" /* if the last bit is set increment the counter */

        "_skipadd:"
                "shrl $1, %eax;" /* dividing the number by 2 */
                "jmp _start;"

        "_final:" /* final location */
                /* now we have to restore the registers */
                "movl %eax, %ebx;" /* storing the result in %eax */
                "ret;"
 );

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System information
naveen@naveen-ubuntu:/$ uname -a
Linux naveen-ubuntu 3.2.0-29-generic-pae #46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU/Linux