USE_MMAP_FOR_BUFFERS segfaulting on startup with today's trunk

[Daniel Colascione]

Is anyone else seeing emacs and associated binaries segfault on startup with
today's trunk when built with USE_MMAP_FOR_BUFFERS?

Program received signal SIGSEGV, Segmentation fault.
mmap_alloc (var=0x762318, nbytes=21)
    at /users/dancol/edev/trunk/src/buffer.c:4906
4906            r->next->prev = r;
(gdb) where
#0  mmap_alloc (var=0x762318, nbytes=21)
    at /users/dancol/edev/trunk/src/buffer.c:4906
#1  0x00495e09 in mmap_realloc (nbytes=21, var=0x762318)
    at /users/dancol/edev/trunk/src/buffer.c:4945
#2  enlarge_buffer_text (b=0x762200, delta=0)
    at /users/dancol/edev/trunk/src/buffer.c:5053
#3  0x00497466 in init_buffer () at /users/dancol/edev/trunk/src/buffer.c:5301
#4  0x00475743 in main (argc=<optimized out>, argv=0x28ab70)
    at /users/dancol/edev/trunk/src/emacs.c:1305

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