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[anguoming <1979259@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I use the master branch；
The glance-api node has 6 workers in my test environment；
My image use cinder as backend and cinder use iscsi volume type. When i download an image server times at the same time，one of the requests is failed，as below message:

2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder [None req-94870f62-c42e-4037-abf6-4d19d79c4d4e 218bcc59c6ca47f49e6d9a8282deb307 e55dac2d24f74b5e99e95afc95c069c4 - default default] Exception while accessing to cinder volume 9ffa69c2-10aa-4104-b88d-8b5c7f7fe9e9.: FileNotFoundError: [Errno 2] No such file or directory: '/dev/sdh'
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder Traceback (most recent call last):
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/_drivers/cinder.py", line 566, in _open_cinder_volume
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     backend=self.backend_group), \
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/usr/lib64/python3.6/contextlib.py", line 81, in __enter__
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     return next(self.gen)
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/_drivers/cinder.py", line 414, in temporary_chown
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     orig_uid = os.stat(path).st_uid
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder FileNotFoundError: [Errno 2] No such file or directory: '/dev/sdh'
2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder
2022-06-20 11:11:28.102 18 DEBUG glance_store.common.attachment_state_manager [None req-94870f62-c42e-4037-abf6-4d19d79c4d4e 218bcc59c6ca47f49e6d9a8282deb307 e55dac2d24f74b5e99e95afc95c069c4 - default default] Got _AttachmentState get_state /var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/common/attachment_state_manager.py:110

** Affects: glance
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1979259

Title:
  glance with cinder backend， we i download the same image server times
  at the same time，the download request may be failed

Status in Glance:
  New

Bug description:
  I use the master branch；
  The glance-api node has 6 workers in my test environment；
  My image use cinder as backend and cinder use iscsi volume type. When i download an image server times at the same time，one of the requests is failed，as below message:

  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder [None req-94870f62-c42e-4037-abf6-4d19d79c4d4e 218bcc59c6ca47f49e6d9a8282deb307 e55dac2d24f74b5e99e95afc95c069c4 - default default] Exception while accessing to cinder volume 9ffa69c2-10aa-4104-b88d-8b5c7f7fe9e9.: FileNotFoundError: [Errno 2] No such file or directory: '/dev/sdh'
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder Traceback (most recent call last):
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/_drivers/cinder.py", line 566, in _open_cinder_volume
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     backend=self.backend_group), \
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/usr/lib64/python3.6/contextlib.py", line 81, in __enter__
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     return next(self.gen)
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder   File "/var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/_drivers/cinder.py", line 414, in temporary_chown
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder     orig_uid = os.stat(path).st_uid
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder FileNotFoundError: [Errno 2] No such file or directory: '/dev/sdh'
  2022-06-20 11:11:28.101 18 ERROR glance_store._drivers.cinder
  2022-06-20 11:11:28.102 18 DEBUG glance_store.common.attachment_state_manager [None req-94870f62-c42e-4037-abf6-4d19d79c4d4e 218bcc59c6ca47f49e6d9a8282deb307 e55dac2d24f74b5e99e95afc95c069c4 - default default] Got _AttachmentState get_state /var/lib/kolla/venv/lib/python3.6/site-packages/glance_store/common/attachment_state_manager.py:110

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