The lack of events is not the issue. We see all the events from the
kernel that we would expect to see during a resize, and we see the same
number (and type) of events on both the passing and the failing
instances.
The problem is that if udev processes the sda1 event first then, at
least some of the time, it doesn't detect that sda1 has a partition on
it, so it doesn't create the by-partuuid symlink for that partition.
See comments #23 and #24 for more detail.
** Also affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1834875
Title:
cloud-init growpart race with udev
Status in cloud-init:
Incomplete
Status in cloud-utils:
New
Status in linux-azure package in Ubuntu:
New
Status in systemd package in Ubuntu:
New
Bug description:
On Azure, it happens regularly (20-30%), that cloud-init's growpart
module fails to extend the partition to full size.
Such as in this example:
========================================
2019-06-28 12:24:18,666 - util.py[DEBUG]: Running command ['growpart',
'--dry-run', '/dev/sda', '1'] with allowed return codes [0] (shell=False,
capture=True)
2019-06-28 12:24:19,157 - util.py[DEBUG]: Running command ['growpart',
'/dev/sda', '1'] with allowed return codes [0] (shell=False, capture=True)
2019-06-28 12:24:19,726 - util.py[DEBUG]: resize_devices took 1.075 seconds
2019-06-28 12:24:19,726 - handlers.py[DEBUG]: finish:
init-network/config-growpart: FAIL: running config-growpart with frequency
always
2019-06-28 12:24:19,727 - util.py[WARNING]: Running module growpart (<module
'cloudinit.config.cc_growpart' from
'/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py'>) failed
2019-06-28 12:24:19,727 - util.py[DEBUG]: Running module growpart (<module
'cloudinit.config.cc_growpart' from
'/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py'>) failed
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 812, in
_run_modules
freq=freq)
File "/usr/lib/python3/dist-packages/cloudinit/cloud.py", line 54, in run
return self._runners.run(name, functor, args, freq, clear_on_fail)
File "/usr/lib/python3/dist-packages/cloudinit/helpers.py", line 187, in run
results = functor(*args)
File "/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py", line
351, in handle
func=resize_devices, args=(resizer, devices))
File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 2521, in
log_time
ret = func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py", line
298, in resize_devices
(old, new) = resizer.resize(disk, ptnum, blockdev)
File "/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py", line
159, in resize
return (before, get_size(partdev))
File "/usr/lib/python3/dist-packages/cloudinit/config/cc_growpart.py", line
198, in get_size
fd = os.open(filename, os.O_RDONLY)
FileNotFoundError: [Errno 2] No such file or directory:
'/dev/disk/by-partuuid/a5f2b49f-abd6-427f-bbc4-ba5559235cf3'
========================================
@rcj suggested this is a race with udev. This seems to only happen on
Cosmic and later.
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