I recently built cvs, and found that I can no longer have multiple instances
of qemu using tun/tap.
the invocation of qemu includes, for each instance:
-net nic -net tap,script=/etc/qemu-ifup
/etc/qemu-ifup:
#!/bin/sh
sudo /sbin/ifconfig $1 192.168.2.196
sudo brctl addif br0 $1
strace of qemu-system-x86_64:
...
open("/dev/net/tun", O_RDWR) = 3
ioctl(3, TUNSETIFF, 0x7fffca661bf0) = -1 EBUSY (Device or resource busy)
write(2, "warning: could not configure /de"..., 72warning: could not
configure /dev/net/tun: no virtual network emulation
) = 72
close(3) = 0
write(2, "Could not initialize device \'tap"..., 34Could not initialize
device 'tap'
) = 34
exit_group(1) = ?
Process 8206 detached
The only thing that has changed is building qemu from cvs yesterday. Prior to
that, I had been using cvs from a few weeks ago.
I'm not too familiar with qemu source, but I will start looking at some of the
commits from the past few weeks for anything.
Any ideas?
Thanks.
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