I've done a bit of digging here:
I encounter the issue in both Lucid and Maverick.
gdb on the generated core, w/ a 'bt' shows:
<snip>
#2 0x000000000046f2c5 in oom_check (size=<value optimised out>)
at qemu-malloc.c:30
#3 qemu_malloc (size=<value optimised out>) at qemu-malloc.c:59
#4 0x000000000044a616 in load_linux (fw_cfg=0x275e060,
kernel_filename=<value optimised out>,
initrd_filename=0x7fff8a0e45d5 "baabaablacksheep",
kernel_cmdline=<value optimised out>, max_ram_size=<value optimised out>)
at /build/buildd/qemu-kvm-0.12.3+noroms/hw/pc.c:876
<snip>
hw/pc.c:876 is an attempt to allocate memory for the size of the initrd,
the function that calculates the size of the initrd returns '-1' if the
file doesn't exist.
Upstream have patched it though to check for an initrd size of -1 and
I'm in the process of grabbing the particular change and getting as a
diff that could be applied.
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kvm -initrd 'file' dumps core if 'file' does not exist
https://bugs.launchpad.net/bugs/619302
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