[LU-17092] umount stuck

• Type: Bug
• Resolution: Unresolved
• Priority: Major
• Affects Version/s: Lustre 2.12.8
• Environment: client client-2.12.8_ddn12 ; server: lustre-2.15.3
• Severity: 3
• Assignee: Qian Yingjin
• Reporter: Mahmoud Hanafi

Description

Umount getting stuck on compute nodes.

24109 umount
[<0>] ll_kill_super+0x7e/0x150 [lustre]
[<0>] lustre_kill_super+0x2b/0x40 [obdclass]
[<0>] deactivate_locked_super+0x34/0x70
[<0>] cleanup_mnt+0x3b/0x70
[<0>] task_work_run+0xa3/0xe0
[<0>] exit_to_usermode_loop+0xef/0x100
[<0>] do_syscall_64+0x19c/0x1b0
[<0>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
 

Looks like a duplicate of LU-14883.

Here are statahead threads

11580 ll_sa_11521
[<0>] ll_statahead_thread+0xc87/0x1210 [lustre]
[<0>] kthread+0x124/0x140
[<0>] ret_from_fork+0x35/0x40

11581 ll_agl_11521
[<0>] ll_agl_thread+0x495/0x500 [lustre]
[<0>] kthread+0x124/0x140
[<0>] ret_from_fork+0x35/0x40 

Issue Links

• is related to: LU-15660 parallel-scale-nfsv4 test_racer_on_nfs: statahead doesn't stop