Hi,
The test looks good, here are my repro steps:
1) Create an Ubuntu 16.04 VM in Azure
2) Attach 128GB data disk
3) Partition and format the disk
# wipefs --all /dev/sdc
# sgdisk -Z /dev/sdc
# sgdisk -n '1:2048::264191' /dev/sdc
# mkfs.ext4 /dev/sdc1
Expected result: mkfs should return very quickly because
lazy_itable_init is enabled.
Actual test results:
- Kernel 4.4.0-71.92: mkfs blocks and formatting takes about
8-minutes.
- Kernel 4.4.0-73.94~lp1682215: mkfs returns immediately.
Thanks!
Steve
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https://bugs.launchpad.net/bugs/1682215
Title:
[Hyper-V] mkfs regression in kernel 4.4+
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