[LU-1840] ldlm_resource_get returns to user space without dropping lr_lvb_mutex

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.0
• Labels: patch
• Severity: 3
• Assignee: Nathaniel Clark
• Reporter: Peng Tao

Description

I got following warnings:

================================================
[ BUG: lock held when returning to user space! ]
3.6.0-rc3 #1 Tainted: G O
------------------------------------------------
bash/1868 is leaving the kernel with locks still held!
1 lock held by bash/1868:
#0: (&res->lr_lvb_mutex)

{......}

, at: [<ffffffffa041a18c>] ldlm_resource_get+0x2cc/0x880 [ptlrpc]