[LU-4863] lctl blockdev_info can cause panics

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.6.0, Lustre 2.5.2
• Severity: 2
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

trying to run the command "lctl blockdev_info" can panic the lustre client. If the command is run on an unused lustre lloop, one not attached to a file with a command like "lctl blockdev_attach /dev/lloop0 /mnt/lustre/file", then the command trips on an LASSERT() and falls over dead.

I plan to push a patch that replaces the LASSERT() with a real error return.