[Qemu-devel] [Bug 655120] Re: VirtFS EFAULT when accessing not existing files

[Moshroum]

The untar without bz2 (second example) also happens when setting PATH to
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

-- 
VirtFS EFAULT when accessing not existing files
https://bugs.launchpad.net/bugs/655120
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Status in QEMU: New

Bug description:
 use as client Debian squeeze i386 with a custom kernel:
Linux (none) 2.6.35.5 #3 Thu Sep 23 18:36:02 UTC 2010 i686 GNU/Linux

And as host Debian squeeze amd64
Linux asd 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 GNU/Linux

kvm version is:
kvm-88-5908-gdd67374

Started the client using:
sudo /usr/local/kvm/bin/qemu-system-x86_64 -m 1024 -kernel linux-2.6.35.5.qemu 
-drive file=root.img,if=virtio -net 
nic,macaddr=02:ca:ff:ee:ba:be,model=virtio,vlan=1 -net 
tap,ifname=tap1,vlan=1,script=no -virtfs 
local,path=/host,security_model=mapped,mount_tag=host -nographic

I've done following inside the guest:
$ mount -t 9p -o trans=virtio host /mnt
$ ls -l /mnt/not-existing
ls: cannot access /mnt/not-existing: Bad address

This return code will for example break make or many other tools.
$ echo $PATH
/mnt/usr/bin:/mnt/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
$ make KERNELDIR=/usr/src/linux
make: execvp: pwd: Bad address
Makefile:54: /Makefile.linux: No such file or directory
make: *** No rule to make target `/Makefile.linux'.  Stop.