The root cause lies in the 9pnet_virtio driver in the guest kernel: it does not support suspend/hibernation...
** Project changed: qemu => linux -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1634852 Title: Qemu VirtFS mounts are not accessible after resuming guest from hibernation Status in Linux: New Bug description: Host OS: Funtoo Linux Host Kernel: 4.7.4-gentoo Qemu Version: 2.7.0 Guest OS: Ubuntu 14.04 Guest Kernel: reproduced with both 4.4.0-42-generic and 3.13.0-98-generic Qemu command line: qemu-system-x86_64 \ -machine type=pc,accel=kvm \ -cpu host \ -smp 3 \ -m 8G \ -netdev bridge,id=hn0,vhost=on \ -device virtio-net-pci,netdev=hn0,mac=52:54:fa:70:35:f7 \ -drive file=/dev/mapper/vg-ubuntu,format=raw,if=virtio,cache=none,discard=on \ -virtfs local,path=/home/dharding/code,security_model=passthrough,mount_tag=code \ -virtfs local,path=/home/dharding/xfer,security_model=passthrough,mount_tag=xfer \ -display gtk Relevant lines from guest /etc/fstab: code /home/dharding/code 9p trans=virtio,version=9p2000.L,msize=262144,_netdev 0 0 xfer /home/dharding/xfer 9p trans=virtio,version=9p2000.L,msize=262144,_netdev 0 0 Steps to reproduce: - start qemu using the above command line - in the guest, run "sudo pm-hibernate" - after qemu exits, run again using the same command line - once the guest resumes from hibernation, run "ls /home/dharding/code" - the ls command will hang forever The ls call stack is: [<ffffffffc00743a0>] p9_client_rpc+0x110/0x460 [9pnet] [<ffffffffc0076a50>] p9_client_getattr_dotl+0x60/0x160 [9pnet] [<ffffffffc009ef77>] v9fs_vfs_getattr_dotl+0x47/0xa0 [9p] [<ffffffff81202a5c>] vfs_getattr_nosec+0x2c/0x40 [<ffffffff81202b26>] vfs_getattr+0x26/0x30 [<ffffffff81202bf5>] vfs_fstatat+0x65/0xa0 [<ffffffff8120306f>] SYSC_newstat+0x1f/0x40 [<ffffffff812032be>] SyS_newstat+0xe/0x10 [<ffffffff817fa4f6>] entry_SYSCALL_64_fastpath+0x16/0x75 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1634852/+subscriptions