Public bug reported: When using iSCSI storage underneath cloud applications such as OpenStack or Kubernetes, the automatic bus scan on login causes problems, because it results in SCSI disks being registered in the kernel that will never get cleaned up, and when those disks are eventually deleted off the server, I/O errors begin to accumulate, eventually slowing down the whole SCSI subsystem, spamming the kernel log, and causing timeouts at higher levels such that users are forced to reboot the node to get back to a usable state.
RedHat discovered this problem more than 3 years ago and fixed it upstream. https://bugzilla.redhat.com/show_bug.cgi?id=1422941 I had hoped that Debian would eventually pick up the version in which it was fixed, but another LTS has gone by without picking up the newer upstream version, and this is a critical problem, so I propose backporting the fixes. The 2 patches that need porting are: https://github.com/open-iscsi/open-iscsi/pull/40 https://github.com/open-iscsi/open-iscsi/pull/49 These changes have been proven safe by 3 years of soak time in the RedHat ecosystem, so I don't see much risk to taking them into Ubuntu. They apply cleanly to the most recent versions of focal, bionic, and xenial. ** Affects: open-iscsi (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1877617 Title: Automatic scans cause instability for cloud use cases To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1877617/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
