Comment 22 for bug 1834875

OK, so we're definitely seeing a DELETE on failure, and it _looks_ like it happens during the growpart:

2019-07-26 10:39:00,725 - util.py[DEBUG]: Running command ['growpart', '/dev/sda', '1'] with allowed return codes [0] (shell=False, capture=True)
Jul 26 10:39:01.324469 tobijk-x-alan-eoan-base-tgqxhgulkkndpdyjlolx inotifywait[462]: 1564137541 /dev/disk/by-partuuid/23f70cea-8174-4426-bc82-462217b97245 DELETE
2019-07-26 10:39:01,339 - util.py[DEBUG]: resize_devices took 1.334 seconds

Looking at the `udevadm monitor` logs from each instance, we only have one udev/kernel remove on each (listed twice, once for the kernel event, once for the corresponding udev event):

ubuntu@<failing>:~$ journalctl -o short-precise -u udevmon.service | grep ACTION=remove -B1
Jul 26 10:39:03.571001 tobijk-x-alan-eoan-base-tgqxhgulkkndpdyjlolx udevadm[251]: KERNEL[36.612409] remove /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/00000000-0001-8899-0000-000000000000/host3/target3:0:1/3:0:1:0/block/sdb/sdb1 (block)
Jul 26 10:39:03.571001 tobijk-x-alan-eoan-base-tgqxhgulkkndpdyjlolx udevadm[251]: ACTION=remove
--
Jul 26 10:39:03.588454 tobijk-x-alan-eoan-base-tgqxhgulkkndpdyjlolx udevadm[251]: UDEV [36.629717] remove /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/00000000-0001-8899-0000-000000000000/host3/target3:0:1/3:0:1:0/block/sdb/sdb1 (block)
Jul 26 10:39:03.588454 tobijk-x-alan-eoan-base-tgqxhgulkkndpdyjlolx udevadm[251]: ACTION=remove

ubuntu@<passing>:~$ journalctl -o short-precise -u udevmon.service | grep ACTION=remove -B1
Jul 26 10:43:33.613194 tobijk-x-alan-eoan-base-afjyuaryhtemavrzofcr udevadm[247]: KERNEL[33.632423] remove /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/00000000-0001-8899-0000-000000000000/host3/target3:0:1/3:0:1:0/block/sdb/sdb1 (block)
Jul 26 10:43:33.613194 tobijk-x-alan-eoan-base-afjyuaryhtemavrzofcr udevadm[247]: ACTION=remove
--
Jul 26 10:43:33.627533 tobijk-x-alan-eoan-base-afjyuaryhtemavrzofcr udevadm[247]: UDEV [33.644486] remove /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/00000000-0001-8899-0000-000000000000/host3/target3:0:1/3:0:1:0/block/sdb/sdb1 (block)
Jul 26 10:43:33.627533 tobijk-x-alan-eoan-base-afjyuaryhtemavrzofcr udevadm[247]: ACTION=remove

I'm going to dig in to the logs a little further to see if I can find anything.