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Date: Mon, 30 Jul 2012 15:35:39 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: [Qemu-devel] 9p broken?
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To: qemu-devel <qemu-devel@nongnu.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: KVM list <kvm@vger.kernel.org>

Having an annoying bug on i386 kvm I decided to debug it buy running an
i386 guest on my x86_64 host, use 9p to access a guest image, and run it
using nested kvm.

However, 9p appears to be broken: first, the configure test fails (patch
sent).  Second, while mount works, ls on the mount point causes qemu to
crash with

(gdb) bt
#0  error_set (errp=0x7fffe95fb128, fmt=0x5555558d4568 "{ 'class':
'VirtFSFeatureBlocksMigration', 'data': { 'path': %s, 'tag': %s } }") at
/home/tlv/akivity/qemu/error.c:32
#1  0x000055555567cb06 in v9fs_attach (opaque=0x7fffe95e3020) at
/home/tlv/akivity/qemu/hw/9pfs/virtio-9p.c:988
#2  0x000055555561d19f in coroutine_trampoline (i0=1449767888, i1=21845)
at /home/tlv/akivity/qemu/coroutine-ucontext.c:138
#3  0x00007ffff5a93ef0 in ?? ()	from /lib64/libc.so.6
#4  0x00007fffffffce00 in ?? ()
#5  0x0000000000000000 in ?? (

**errp already points to a VirtFSFeatureBlocksMigration error;
v9fs_attach() has been called a second time (the first time,
understandably, on mount; the second on ls).

Command line:

qemu-system-x86_64 -m 4G -smp 4 -drive
file=/images/Fedora-i386.img,if=virtio,cache=none -cdrom
/images/iso/bfo.iso -device virtio-9p-pci,fsdev=root,mount_tag=root
-fsdev local,id=root,path=/,security_model=passthrough -enable-kvm -net
nic,model=virtio,netdev=net -netdev user,id=net -monitor stdio -cpu host

-- 
error compiling committee.c: too many arguments to function