On 08/29/2013 02:27 PM, Christof Schulze wrote:
> #5  0x6012a100 in tb_gen_code (env=0x612def20, pc=18446744073699066880, 
> cs_base=0, flags=4243635, cflags=0)
>     at /mnt/data/build/qemu-1.6.0-ministatic/translate-all.c:964

In know exactly what this is -- the fallback vsyscall page.

I've had a patch set around for the last three years or so to provide
a real vdso for x86_64.  I repost it every so often, usually to no
response.

See git://github.com/rth7680/qemu.git elfload-vdso


r~