Current QEMU 2.7 does not segfault here anymore, and the "thesecurity" problem is also not available in the sources anymore ==> I think this can be closed nowadays.
** Changed in: qemu Status: New => Fix Released -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/674740 Title: qemu segfaults when security_model=none using virtio-9p-pci driver Status in QEMU: Fix Released Bug description: qemu version: 0.13 commit-id: 6ed912999d6ef636a5be5ccb266d7d3c0f0310b4 example invocation: $ qemu -virtfs local,path=/tmp,security_model=none,mount_tag=mmm r.img one of the following must be specified as thesecurity option: security_model=passthrough security_model=mapped Segmentation fault Patch is attached. Also attached is a patch that addes the space between 'the' and 'security' in 'thesecurity'. Does not affect trunk. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/674740/+subscriptions