Thanks for continuing to dig into this.
Comparing your nova-compute logs and the strace unlink details, the
timestamps do seem to point to unlink causing the delay. Pasting the
strace unlink output below inline with the nova-compute logs in order of
occurrence:
nova-compute log:
2018-04-25 14:48:04.587 54255 INFO nova.virt.libvirt.driver
[req-85551d96-713d-499d-b7ff-9f911fb0842d bc0ab055427645aca4ed09266e85b1db
1cb457a8302543fea067e5f14b5241e7 - - -] [instance:
bd17aeef-240b-489c-8bb6-b37167155174] Deleting instance files
/srv/nova/instances/bd17aeef-240b-489c-8bb6-b37167155174_del
strace unlink:
54255 14:48:04.593792
unlink("/srv/nova/instances/bd17aeef-240b-489c-8bb6-b37167155174_del/disk"
<unfinished ...>
strace unlink:
54255 14:52:06.349167 <... unlink resumed> ) = 0
54255 14:52:06.349430
unlink("/srv/nova/instances/bd17aeef-240b-489c-8bb6-b37167155174_del/disk.info")
= 0
nova-compute log:
2018-04-25 14:52:06.350 54255 INFO nova.virt.libvirt.driver
[req-85551d96-713d-499d-b7ff-9f911fb0842d bc0ab055427645aca4ed09266e85b1db
1cb457a8302543fea067e5f14b5241e7 - - -] [instance:
bd17aeef-240b-489c-8bb6-b37167155174] Deletion of
/srv/nova/instances/bd17aeef-240b-489c-8bb6-b37167155174_del complete
This might be worth passing by kernel folks to get their opinion.
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https://bugs.launchpad.net/bugs/1766543
Title:
instance deletion takes a while and blocks nova-compute
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