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[Qemu-devel] multiple tun/tap instances no longer working

From: Rick Vernam
Subject: [Qemu-devel] multiple tun/tap instances no longer working
Date: Tue, 9 Jan 2007 10:57:18 -0600
User-agent: KMail/1.9.5

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

sudo /sbin/ifconfig $1
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?

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