[LU-16536] MDS umount can get stuck due to LDLM locks

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

the scenario is the following:

• rmdir is trying to unlink a striped dir
• a set of LDLM locks (from different MDT) are held by MDT
• number of RPCs are sent to another MDTs to destroy the objects
• another MDT umounts and no reply is sent back
• this MDT starts to umount, deactivate OSP#0 (corresponding RPCs are interrupted) and waiting for LDLM lock in this namespace to release
• the lock is still held by the original MDT thread doing rmdir
• other OSPs are still active trying to reconnect to umounted MDTs
• deadlock

Issue Links

• is related to: LU-16753 replay-single: test_135 timeout

Comments

[Peter Jones]

Landed for 2.16

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/c/fs/lustre-release/+/49925/
Subject: LU-16536 osp: don't cleanup ldlm in precleanup phase
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: eed4d4c7523c26cfc5bc230986d96b2acf152dee

[Gerrit Updater]

"Alex Zhuravlev <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/49925
Subject: LU-16536 osp: don't cleanup ldlm in precleanup phase
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: fcec71d596988513e1ba841eda30a7336705c400