[LU-11617] lockdep exposed a possible deadlock in chlg_open()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Affects Version/s: Lustre 2.11.0, Lustre 2.12.0, Lustre 2.10.5
• Severity: 3
• Assignee: James A Simmons
• Reporter: James A Simmons

Description

While testing the changelog char device landing in the linux client Neil saw lockdep report a potential deadlock between chlg_open() and mdc_changelog_cdev_init().