Bug 2155314

Description of problem:

** I am cloning this BZ from BZ #1779813 which was for RHEL 7, as the customer has confirmed that the fix is NOT needed in RHEL 7 but is now needed in RHEL 8 I am creating this new BZ to track changes in RHEL 8 **

A customer has a SAS Expander that expands their devices out to a name longer than 256 characters when the path is exploded.

    # systemd-escape /devices/pci0000:00/0000:00:02.0/0000:02:00.0/host10/port-10:0/expander-10:0/port-10:0:0/expander-10:1/port-10:1:0/expander-10:2/port-10:2:0/expander-10:3/port-10:3:13/end_device-10:3:13/target10:0:89/10:0:89:0/scsi_device/10:0:89:0 | wc
	  1       1     263

This causes the systemd to fail on the device with:

    systemd: Failed to set up device unit: Invalid argument

And then the systemd job times out and the mounts fail.

This value appears to be arbitrarily increased over time.  We gave the customer a test patch that raised UNIT_NAME_MAX in shared/unit-name.h to 512 and it resolved their issue.

Requesting that this value be raised to 512.


Version-Release number of selected component (if applicable):
systemd-239-68.el8.x86_64

How reproducible:
Every time if the device name is over 256 characters.


Steps to Reproduce:
1.  Attach a device with a path over 256 characters.
2.  Boot the server
3.  Check the logs for errors.

Actual results:

systemd errors with:

    systemd: Failed to set up device unit: Invalid argument

And times out the device.

Expected results:

System boots without any issues.

Additional info: