Segmentation Fault 11 linking os x 32-bit assembler

UPDATE: Sure enough, it was a bug in the latest version of nasm. I "downgraded" and after fixing my code as shown in the answer I accepted, everything is working properly. Thanks, everyone!

I'm having problems with what should be a very simple program in 32-bit assembler on OS X.

First, the code:

section .data
hello   db  "Hello, world", 0x0a, 0x00

section .text
default rel

global _main
extern _printf, _exit

_main:
    sub esp, 12     ; 16-byte align stack
    push hello
    call _printf

    push 0
    call _exit

It assembles and links, but when I run the executable it crashes with a segmentation fault: 11.

The command lines to assemble and link are:

nasm -f macho32 hello32x.asm -o hello32x.o

I know the -o there is not 100 percent necessary

Linking:

ld -lc -arch i386 hello32x.o -o hello32x

When I run it into lldb to debug it, everything is fine until it enters into the call to _printf, where it crashes as shown below:

  (lldb) s
  Process 1029 stopped
  * thread #1: tid = 0x97a4, 0x00001fac hello32x`main + 8, queue = 'com.apple.main-thread', stop reason = instruction step into
      frame #0: 0x00001fac hello32x`main + 8
  hello32x`main:
  ->  0x1fac <+8>:  calll  0xffffffff991e381e
      0x1fb1 <+13>: pushl  $0x0
      0x1fb3 <+15>: calll  0xffffffff991fec84
      0x1fb8:       addl   %eax, (%eax)
  (lldb) s
  Process 1029 stopped
  * thread #1: tid = 0x97a4, 0x991e381e libsystem_c.dylib`vfprintf + 49, queue = 'com.apple.main-thread', stop reason = instruction step into
      frame #0: 0x991e381e libsystem_c.dylib`vfprintf + 49
  libsystem_c.dylib`vfprintf:
  ->  0x991e381e <+49>: xchgb  %ah, -0x76f58008
      0x991e3824 <+55>: popl   %esp
      0x991e3825 <+56>: andb   $0x14, %al
      0x991e3827 <+58>: movl   0xc(%ebp), %ecx
  (lldb) s
  Process 1029 stopped
  * thread #1: tid = 0x97a4, 0x991e381e libsystem_c.dylib`vfprintf + 49, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x890a7ff8)
      frame #0: 0x991e381e libsystem_c.dylib`vfprintf + 49
  libsystem_c.dylib`vfprintf:
  ->  0x991e381e <+49>: xchgb  %ah, -0x76f58008
      0x991e3824 <+55>: popl   %esp
      0x991e3825 <+56>: andb   $0x14, %al
      0x991e3827 <+58>: movl   0xc(%ebp), %ecx

As you can see toward the bottom, it stops due to a bad access error.