The latest LTS (jammy) is missing this patch, and causes a failure in
LUN operations when the host is running the HWE kernel, v6.5.

 python3-rtslib-fb | 2.1.74-0ubuntu4   | jammy                  | all
 python3-rtslib-fb | 2.1.74-0ubuntu5   | mantic                 | all
 python3-rtslib-fb | 2.1.74-0ubuntu5   | noble                  | all

Those are the log lines from the ceph-iscsi use cases (to expose an RBD
volume over iSCSI/LIO) and it fails to complete the export creation and
will be stuck at an unrecoverable state unless manually fixing
gateway.conf in rados by deleting a half broken volume.

====
(LUN.allocate) created test-iscsi-pool/disk_1 successfully
(LUN.add_dev_to_lio) Adding image 'test-iscsi-pool/disk_1' to LIO backstore 
user:rbd
tcmu-runner: tcmu_rbd_open:1162 rbd/test-iscsi-pool.disk_1: address: 
{172.16.12.185:0/2337103748}
(LUN.add_dev_to_lio) Successfully added test-iscsi-pool/disk_1 to LIO
LUN alloc problem - Delete from LIO/backstores failed - [Errno 20] Not a 
directory: '/sys/kernel/config/target/iscsi/cpus_allowed_list'
====

similar report:
https://bugs.launchpad.net/python-cinderclient/yoga/+bug/2008010

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https://bugs.launchpad.net/bugs/1988366

Title:
  python-rtslib-fb needs to handle new attribute cpus_allowed_list

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