Comment 22 for bug 1531768

Darn, I now get the "instance kills itself after some time" on the 4x CPU as well. nova console-log shows the blurb below and ssh and lxd ports are dead (so I can't learn anything further from the box than console-log).

Ubuntu Xenial Xerus (development branch) lxd-armhf2 ttyAMA0

lxd-armhf2 login: [ 954.144506] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 954.145743] 1-...: (79 GPs behind) idle=284/0/0 softirq=407182/407182 fqs=1
[ 954.147202] (detected by 3, t=15002 jiffies, g=21817, c=21816, q=1563)
[ 954.148590] Call trace:
[ 954.149123] rcu_sched kthread starved for 15002 jiffies! g21817 c21816 f0x0 s3 ->state=0x1
[ 3000.217089] INFO: task systemd:1 blocked for more than 120 seconds.
[ 3000.218529] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3000.219628] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3000.221310] Call trace:
[ 3000.222562] INFO: task kworker/0:2:12463 blocked for more than 120 seconds.
[ 3000.223985] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3000.225146] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3000.226741] Call trace:
[ 3000.227306] INFO: task (d-logind):15441 blocked for more than 120 seconds.
[ 3000.228685] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3000.229834] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3000.231469] Call trace:
[ 3120.231067] INFO: task systemd:1 blocked for more than 120 seconds.
[ 3120.232501] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3120.233629] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3120.235393] Call trace:
[ 3120.236702] INFO: task kworker/0:2:12463 blocked for more than 120 seconds.
[ 3120.238188] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3120.239398] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3120.241140] Call trace:
[ 3120.241716] INFO: task (d-logind):15441 blocked for more than 120 seconds.
[ 3120.243223] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3120.244366] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3120.245945] Call trace:
[ 3240.244955] INFO: task systemd:1 blocked for more than 120 seconds.
[ 3240.246398] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3240.247526] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3240.249272] Call trace:
[ 3240.250568] INFO: task kworker/0:2:12463 blocked for more than 120 seconds.
[ 3240.252060] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3240.253280] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3240.254966] Call trace:
[ 3240.255549] INFO: task (d-logind):15441 blocked for more than 120 seconds.
[ 3240.257073] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3240.258259] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3240.259906] Call trace:
[ 3360.258901] INFO: task systemd:1 blocked for more than 120 seconds.
[ 3360.260349] Not tainted 4.4.0-2-generic #16-Ubuntu
[ 3360.261475] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3360.263224] Call trace: