Inexplicable high memory usage

Hi,

for a couple days I have this weird problem that my unraid server uses way too much memory after half a day, or a day which leads to shutting down one VM.

Also the Array Status Indicator in the bottom left starts flickering between 'Array Started' and 'Array Status Pending'.

When I tried to download the diagnostics, I always landed on a blank " / " page, so I just copied every possible logline from the syslog, I thought was important. I also added the diagnostics log from after the reboot - maybe that helps.

Here is also some libvirt log

2018-10-03 07:59:27.865+0000: 2999: info : libvirt version: 4.6.0
2018-10-03 07:59:27.865+0000: 2999: info : hostname: Tower
2018-10-03 07:59:27.865+0000: 2999: error : virGetUserID:1043 : invalid argument: Failed to parse user 'tss'
2018-10-03 07:59:27.866+0000: 2999: error : virGetGroupID:1123 : invalid argument: Failed to parse group 'tss'
2018-10-03 07:59:28.775+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=1 name='Odin' uuid=53ebb5aa-5367-33db-8ea2-ee3581791035 is tainted: high-privileges
2018-10-03 07:59:28.775+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=1 name='Odin' uuid=53ebb5aa-5367-33db-8ea2-ee3581791035 is tainted: host-cpu
2018-10-03 07:59:30.210+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=2 name='thor' uuid=472bce30-c4f7-c491-5713-e0cc8fc06946 is tainted: high-privileges
2018-10-03 07:59:30.210+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=2 name='thor' uuid=472bce30-c4f7-c491-5713-e0cc8fc06946 is tainted: host-cpu
2018-10-03 07:59:30.963+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=3 name='Sardonyx' uuid=5dbdad36-ffd6-fc65-f76d-7dec83ebc0b2 is tainted: high-privileges
2018-10-03 07:59:30.963+0000: 2999: warning : qemuDomainObjTaint:7546 : Domain id=3 name='Sardonyx' uuid=5dbdad36-ffd6-fc65-f76d-7dec83ebc0b2 is tainted: host-cpu

The only way I can resolve this issue is to reboot the server.

Problems started when I upgraded to Unraid 6.6.0. At first I thought it has to do with the newer libvirt version (4.6.0), so i downgraded to 6.5.3 again, but that didn't fix it. So i upgraded to 6.6.1 when it came out in hopes that there was a fix now, but there wasn't.

Server Specs:

HP Microserver Gen8

Intel i5-3470T

16GB memory

4x 3TB HDDs, 1 small cache ssd, 1 1TB external HDD

3 VMs (1 Windows, 2 Linux) and 5 docker container.

unraid_error_log.txt

tower-diagnostics-20181003-1028.zip