I don't know if this helps but the same happens with me (qemu 1:2.8+dfsg-6),
and I also tried removing all qemu packages and compiling 2.9.0 from scractch
(downloaded the released  2.9.0 from the qemu site), and the problem persists.
It's also Windows 7  on a x86_64 system which is being emulated, and the 
memory leak only shows up when using the network. The command-line 
arguments are

    -monitor stdio \
    -soundhw ac97 \
    -machine accel=kvm \
    -m 512 \
    -hda /home/qemu-user/Windows_7_x64_HDA.img \
    -boot once=c,menu=off \
    -net nic,vlan=0 \
    -net user,vlan=0 \
    -net user,tftp=/home/qemu-user/win \
    -net user,smb=/home/qemu-user/win \
    -rtc base=localtime \
    -name "Windows 7 x64"

J.

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