kern/86779: taskqueue_enqueue_fast uses spinlock on sleep mutex in fbsd-5.4-stable

[Konstantin Prokazoff]

>Number:         86779
>Category:       kern
>Synopsis:       taskqueue_enqueue_fast uses spinlock on sleep mutex in fbsd-5.4-stable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Oct 01 09:10:17 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Konstantin Prokazoff
>Release:        5.4
>Organization:
SVR Ltd.
>Environment:
5.4-STABLE
>Description:
SMP on 1xXeon (HT enabled), INTR_FAST handler enqueues task to taskqueue_thread using taskqueue_enqueue_fast. Kernel panics, cause taskqueue_enqueue_fast tries to spinlock sleep mutex taskqueue.
>How-To-Repeat:
taskqueue_enqueue_fast() in INTR_FAST handler code.
>Fix:
Not known.
>Release-Note:
>Audit-Trail:
>Unformatted: