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Stefan managed to reproduce this and we've located the root cause. Backtrace doesn't really help here, the issue is the iothread didn't get awakened correctly by aio_enable_external(). Clearing the needinfo therefore.
A fix will need to be worked on upstream.
Verified on:
qemu-kvm-rhev-2.9.0-5.el7.x86_64
kernel-3.10.0-640.el7.x86_64
Steps same as comment 0, add block stream test afterwards.
Result:
As expected, guest works well after live snapshot and block stream.
Moving to VERIFIED.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2017:2392
Description of problem: Guest hang after live snapshot with data-plane Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.9.0-1.el7.x86_64 kernel-3.10.0-643.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. Launch guest with data-plane: /usr/libexec/qemu-kvm \ -name 'avocado-vt-vm1' \ -vga cirrus \ -object iothread,id=iothread0 \ -device virtio-scsi-pci,iothread=iothread0,id=virtio_scsi_pci0,bus=pci.0,addr=03 \ -drive id=drive_image1,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=/home/kvm_autotest_root/images/rhel74-64-virtio-scsi.qcow2 \ -device scsi-hd,id=image1,drive=drive_image1 \ -device virtio-net-pci,mac=9a:ac:ad:ae:af:b0,id=idqKTtyC,vectors=4,netdev=idBAxKKY,bus=pci.0,addr=04 \ -netdev tap,id=idBAxKKY,vhost=on \ -m 4096 \ -smp 4,cores=2,threads=1,sockets=2 \ -cpu 'SandyBridge',+kvm_pv_unhalt \ -vnc :0 \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=c,menu=off,strict=off \ -monitor stdio \ -qmp tcp::5555,server,nowait 2. Live snapshot: {'execute': 'blockdev-snapshot-sync', 'arguments': {'device': 'drive_image1', 'snapshot-file': '/home/kvm_autotest_root/images/sn1', 'mode': 'absolute-paths', 'format': 'qcow2'}, 'id': 'Wh5neQ4H'} 3. Check guest Actual results: Guest freeze, no response to mouse and keyboard. Tt's able to ping, but can't ssh login. Expected results: Guest works well. Additional info: qemu-kvm-rhev-2.6.0-27.el7.x86_64 works well, so this is a regression.