[LU-13121] ll_update_lsm_md() may deadlock

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0, Lustre 2.12.4
• Affects Version/s: Lustre 2.12.0, Lustre 2.13.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

ll_update_lsm_md() down_write() if lli->lli_lsm_md is NULL, and tries to initialize it, but if a concurrent lookup initialized lli->lli_lsm_md after this check and before taking write lock, it will up_read(), so the write lock is not released, therefore subsequent lookup will deadlock on this.

Issue Links

• is related to: LU-13099 ll_set_inode()) Can not initialize inode warning

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/37325/
Subject: LU-13121 llite: fix deadlock in ll_update_lsm_md()
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: ed1391adec4a10075a72b21c506293c6cf9ece95

[Gerrit Updater]

Lai Siyao ([e-mail]) uploaded a new patch: https://review.whamcloud.com/37325
Subject: LU-13121 llite: fix deadlock in ll_update_lsm_md()
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: e6b51d19800a73e709b6e9966c60303c9edcd8f7

[Peter Jones]

Landed for 2.14

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/37182/
Subject: LU-13121 llite: fix deadlock in ll_update_lsm_md()
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 3746550282c865deebb07bfd92bcb4d1dabdc675

[Gerrit Updater]

Lai Siyao ([e-mail]) uploaded a new patch: https://review.whamcloud.com/37182
Subject: LU-13121 llite: fix deadlock in ll_update_lsm_md()
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: b6fe727cb5d2902b39964f77945110251177feda