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[Qemu-devel] Livelock with qemu 2.5.0
From: |
Brian Candler |
Subject: |
[Qemu-devel] Livelock with qemu 2.5.0 |
Date: |
Fri, 2 Dec 2016 14:19:45 +0000 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
I am running a VM under qemu 2.5.0/Ubuntu 16.04. The guest VM is also
Ubuntu 16.04, with ZFS and LXD, and I am hitting it hard with I/O,
concurrently building multiple LXD containers. Previously it was
serialized to build one container at a time, and it was fine.
With the concurrent builds I got to a point where the VM livelocked:
- CPU utilisation on the host is 100%:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20321 libvirt+ 20 0 18.864g 0.014t 23032 S 100.3 45.7 603:33.30
qemu-system-x86
(host has 32GB of RAM, plenty of headroom there)
- VM does not respond to ping
- I can connect to VM's VNC console, and it shows the login prompt, but
keystrokes are ignored
I attached gdb and took backtraces (attached)
I imagine I could have hit a problem either with qemu, or with the guest
kernel itself. So next I'm going to try to replicate this with qemu
2.7.0. But I thought I'd post the backtraces here first to see if
anyone has any comments/thoughts about what's going on.
Thanks,
Brian.
P.S. I'm not subscribed to qemu-devel so please CC me directly.
qemu-2.5.0-livelock.txt
Description: Text document
- [Qemu-devel] Livelock with qemu 2.5.0,
Brian Candler <=