Using mdadm-3.2.2 from openSUSE_12.1:
# modprobe brd rd_size=1 rd_nr=4096
# mdadm -C /dev/md9 -l 10 -n 384 /dev/ram{0..383}
mdadm: Defaulting to version 1.2 metadata
Segmentation fault (core dumped)
#1 Create (st=0xb4c600, mddev=0x7fff3bda64c0 "/dev/md9", chunk=512, level=10,
layout=12593328, size=4, raiddisks=384, sparedisks=0,
name=0x7fff3bda64c7 "9", homehost=0x7fff3bda6fe0 "seven", uuid=0x0,
subdevs=384, devlist=0xb49030, runstop=0, verbose=0, force=0,
assume_clean=0, bitmap_file=0x0, bitmap_chunk=65534, write_behind=0,
delay=5, autof=0) at Create.c:899
899 fprintf(stderr,
(gdb) l
894 info_new.uuid, chosen_name);
895 me = map_by_devnum(&map, st->container_dev);
896 }
897
898 if (st->ss->write_init_super(st)) {
899 fprintf(stderr,
900 Name ": Failed to write metadata to %s\n",
901 dv->devname);
902 st->ss->free_super(st);
903 goto abort;
(gdb) p dv
$1 = <optimized out>
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