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Date:      Fri, 13 Mar 1998 13:22:16 +1100
From:      Bruce Evans <bde@zeta.org.au>
To:        bugs@FreeBSD.ORG
Cc:        dyson@FreeBSD.ORG
Subject:   sleep holding a simple lock
Message-ID:  <199803130222.NAA32629@godzilla.zeta.org.au>
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	/*
	 * Destroy the copy in the VM cache, too.
	 */
	simple_lock(&vp->v_interlock);
	object = vp->v_object;
	if (object != NULL) {
		if (flags & V_SAVEMETA)
			vm_object_page_remove(object, 0, object->size,
				(flags & V_SAVE) ? TRUE : FALSE);
		else
			vm_object_page_remove(object, 0, 0,
				(flags & V_SAVE) ? TRUE : FALSE);
	}
	simple_unlock(&vp->v_interlock);

The above code in vfs_subr.c sleeps holding a simple lock if
vm_object_page_remove() sleeps.  There is obviously no way for
vm_object_page_remove() to release the lock.

Bruce

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