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I'm experiencing 16.04.02 total crashes during night since 2 days.

i was able to see the error shortly -> vm ran out of memory. the vm was installed in january with 4GB RAM, after first crash i upgraded to 8GB. But when i start the VM Backup (veeam) the available memory is going down for 10-15 MB/s till 0 -> then crash

Edit from comment:

My partition layout is as shown. PLayout

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  • Do you have a swap partition or swapfile? Show me the output of free -h.
    – heynnema
    Mar 30, 2017 at 14:03
  • What do you do on this VM that even 8GB is not enough for it?
    – Mostafa Ahangarha
    Mar 30, 2017 at 15:55
  • i have swap there is only nginx running on this VM. i set i up with 4GB RAM, but after first crash i added 4GB (just to see). during normal operation there are 90% free memory -> just when starting VM backup (Hyper-V) RAM will be used as hell till out of memory here are my partitions:
    – R. Zach
    Mar 31, 2017 at 8:07
  • link
    – R. Zach
    Mar 31, 2017 at 8:12
  • It's not surprising (at least to me) that running a backup would utilize a lot of RAM is it's likely caching content like mad. The crashing on the other hand is unexpected.
    – Elder Geek
    Apr 10, 2017 at 13:41

2 Answers 2

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Bug in kernel starts with 4.4.0-67, workaround: remove DVD from the VM. Works in my case.

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    This seems to be an incomplete answer, otherwise potentially a useful answer. Consider to include supporting details and explain how to set up the solution. In particular, quote link to bug report this one and another one. The latter has recent comments (#47 and onwards) that mentioned "removing DVD from VM" works.
    – user37165
    Apr 10, 2017 at 13:22
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It appears that this issue is a regression from this previously fixed bug as mentioned here If I'm understanding correctly this is possibly due to changes in HyperV.

The workaround touched on in the partial yet useful @noirfry answer is mentioned in the bug report here and confirmed here.

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