[LU-3157] A not locked mutex can be unlocked in ll_file_open()

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.4.1, Lustre 2.5.0
• Severity: 3
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Dmitry Eremin (Inactive)

Description

In case of memory pressure a not locked mutex can be unlocked in function ll_file_open(). This is not allowed and subsequent behavior is not defined.

/***

• mutex_unlock - release the mutex
• @lock: the mutex to be released
• Unlock a mutex that has been locked by this task previously.
• This function must not be used in interrupt context. Unlocking
• of a not locked mutex is not allowed.
• This function is similar to (but not equivalent to) up().
  */

Comments

[Dmitry Eremin (Inactive)]

Patch set is http://review.whamcloud.com/6028