[LU-12217] ll_migrate() vs truncate deadlock

• Status: Open
• Project: Lustre
• Type: Bug
• Priority: Minor
• Reporter: Andriy Skulysh
• Assignee: Andriy Skulysh
• Resolution: Unresolved
• Severity: 3

Description

ll_migrate() takes inode_lock and sends OST_GETATTR
via ll_data_version(). The server sends BL AST to
a truncate on the same client to release osc lock
but it waits for the inode lock.
It's a wrong locking order beacause all osc operations
take ldlm locks before inode_lock.

inode_lock was added to protect from simultaneous migrates
from 1 client. But lli_lsm_sem is taken for parent,
so inode_lock isn't needed.

Comments

[Gerrit Updater]

Andriy Skulysh ([e-mail]) uploaded a new patch: https://review.whamcloud.com/34752
Subject: LU-12217 llite: ll_migrate() vs truncate deadlock
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: d5286b9387032a093cfde379b1ce51facfae37ef