[LU-18071] Single client job -o flock zombie flock remains on file, -o local flock works fine

• Type: Bug
• Resolution: Unresolved
• Priority: Major
• Affects Version/s: Lustre 2.15.5

Environment

Server: Rocky 8.6 x86_64, ko2iblnd (MOFED), 2.15.4
Client: Rocky 8.10 x86_64, ko2iblnd (inbox), 2.15.5
Client patched with LU-17692 and LU-17589

Epic/Theme

client

• Severity: 3
• Assignee: WC Triage
• Reporter: Jeff Johnson

Description

Single node mpi data analysis job (8 cpu) running on client. Job completes fine but subsequent runs fail because a file in the dataset remains locked. A remount clears file lock.

After application on Client of LU-17692 and LU-17589 the below error message is issued on the client after the job runs successfully and then the file lock status is checked.

00000080:00020000:7.0F:1722023688.289109:0:2533:0:(file.c:4899:ll_file_flock()) Flock LR mismatch! inode=[0x200000bd2:0xae:0x0], flags=0x80000, mode=2, pid=2318/2533, start=0/0, end=0/9223372036854775807,type=0/2

Remounting with -o localflock the job runs fine and no zombie flock remains. 

Back to mounting on client '-o flock' and re-running application job. File remains locked. Any attempt to release the lock triggers the "Flock LS mismatch error" on the client.

00000080:00020000:7.0:1722024764.304245:0:3100:0:(file.c:4899:ll_file_flock()) Flock LR mismatch! inode=[0x200000bd2:0xae:0x0], flags=0x80000, mode=2, pid=2778/3100, start=0/0, end=0/9223372036854775807,type=0/2
00000080:00020000:7.0:1722025303.376488:0:3179:0:(file.c:4899:ll_file_flock()) Flock LR mismatch! inode=[0x200000bd2:0xae:0x0], flags=0x80000, mode=2, pid=2778/3179, start=0/0, end=0/9223372036854775807,type=0/2
Debug log: 390 lines, 390 kept, 0 dropped, 0 bad.
00000080:00020000:7.0F:1722025407.995185:0:3184:0:(file.c:4899:ll_file_flock()) Flock LR mismatch! inode=[0x200000bd2:0xae:0x0], flags=0x80000, mode=2, pid=2778/3184, start=0/0, end=0/9223372036854775807,type=0/2
Debug log: 1 lines, 1 kept, 0 dropped, 0 bad.

Also used a test program to check the lock (attached).