continuation ...

>> this functions reads the log file from a QEMU VM 
>> it tries to filter non qemu related messages out. 
>> from the dump I can extract: 

""" 
instance-0000347e/monitor.sock,server,nowait -mon 
chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global 
kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on -device 
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive ... -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1
 -netdev tap,fd=118,id=hostnet0,vhost=on,vhostfd=120 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=...,bus=pci.0,addr=0x3 -chardev 
file,id=charserial0,path=/var/lib/nova/instances/.../console.log -device 
isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device 
isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0 -vnc ... 
-k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on\nwarning: 
host doesn't support requested feature: CPUID.01H:EDX.ds [bit 21]\nwarning: 
host doesn't support requested feature: CPUID.01H:EDX.ac
 pi [bit 22]\nwarning: host doesn't support requested feature: CPUID.01H:EDX.ht 
[bit 28]\nwarning: host doesn't support requested feature: CPUID.01H:EDX.tm 
[bit 29]\nwarning: host doesn't support requested feature: CPUID.01H:EDX.pbe 
[bit 31]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.dtes64 
[bit 2]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.monitor 
[bit 3]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.ds_cpl 
[bit 4]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.smx 
[bit 6]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.est 
[bit 7]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.tm2 
[bit 8]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.xtpr 
[bit 14]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.pdcm 
[bit 15]\nwarning: host doesn't support requested feature: CPUID.01H:ECX.dca 
[bit 18]\n2017-02-28T06:07:41.238568Z qemu-system-x86_64: cannot s
 et up guest memory 'pc.ram': Cannot allocate memory 
""" 

>> So this is from the instance "0000347e" and QEMU died because it couldn't 
>> allocate memory. 
>> That doesn't explain why libvirt has died, but gives us a good idea.

#7 0x00007f942c00c119 in qemuProcessReadLog (msg=0x7ffe2f31c098,
logCtxt=<optimized out>) at ../../../src/qemu/qemu_process.c:1684

... continues ...

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https://bugs.launchpad.net/bugs/1670659

Title:
  Libvirt can crash on lack of memory when starting multiple instances

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