[LU-9704] ofd_grant_check() claims GRANT, real grant 0

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.8, Lustre 2.15.0
• Affects Version/s: Lustre 2.9.0
• Environment: 3.10.0-514.16.1.el7_lustre.x86_64, lustre-2.9.0_srcc7-1.el7.centos.x86_64
• Severity: 3
• Assignee: Mikhail Pershin
• Reporter: Stephane Thiell

Description

Hi,

After about 2 months of production, our new Lustre 2.9-based system (Oak) started to show the following Lustre errors in the logs on our OSS servers, just a few days ago:

Jun 22 10:45:06 oak-io1-s1 kernel: LustreError: 26807:0:(ofd_grant.c:641:ofd_grant_check()) oak-OST0014: cli 1b1c6319-5ec1-dbcc-f6e7-f85575c95c4c claims 131072 GRANT, real grant 0

Attaching an lquota subsystem debug trace on one of the OSS and a splunk graph showing that these messages are actually new. I first thought that this could be related to LU-9671 but it might not be after all.

Thanks,
Stephane

Issue Links

• is related to: LU-13457 tgt_grant_check() cli claims grant
• is related to: LU-14125 client starved for grant but OST has plenty of free space
• is related to: LU-14124 super slow i/o on client maybe related to low grant