11909 THREAD_KPRI_RELEASE does nothing of the sort
Reviewed by: Bryan Cantrill <bryan@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 19,29 ****
   * CDDL HEADER END
   */
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
!  * Copyright 2011 Joyent, Inc.  All rights reserved.
   */
  
  /*
   * Copyright (c) 2016 by Delphix. All rights reserved.
   */
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
!  * Copyright 2019 Joyent, Inc.
   */
  
  /*
   * Copyright (c) 2016 by Delphix. All rights reserved.
   */
*** 1378,1388 ****
          /* Initialize bp->b_sem in "locked" state */
          sema_init(&bp->b_sem, 0, NULL, SEMA_DEFAULT, NULL);
  
          VN_HOLD(vp);
          bp->b_vp = vp;
-         THREAD_KPRI_RELEASE_N(btopr(len)); /* release kpri from page_locks */
  
          /*
           * Caller sets dev & blkno and can adjust
           * b_addr for page offset and can use bp_mapin
           * to make pages kernel addressable.
--- 1378,1387 ----