releases/4.14.7/blk-mq-avoid-that-request-queue-removal-can-trigger-list-corruption.patch

   1 From foo@baz Tue Dec 12 10:32:42 CET 2017
   2 From: Bart Van Assche <bart.vanassche@wdc.com>
   3 Date: Wed, 8 Nov 2017 10:23:45 -0800
   4 Subject: blk-mq: Avoid that request queue removal can trigger list corruption
   5
   6 From: Bart Van Assche <bart.vanassche@wdc.com>
   7
   8
   9 [ Upstream commit aba7afc5671c23beade64d10caf86e24a9105dab ]
  10
  11 Avoid that removal of a request queue sporadically triggers the
  12 following warning:
  13
  14 list_del corruption. next->prev should be ffff8807d649b970, but was 6b6b6b6b6b6b6b6b
  15 WARNING: CPU: 3 PID: 342 at lib/list_debug.c:56 __list_del_entry_valid+0x92/0xa0
  16 Call Trace:
  17  process_one_work+0x11b/0x660
  18  worker_thread+0x3d/0x3b0
  19  kthread+0x129/0x140
  20  ret_from_fork+0x27/0x40
  21
  22 Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
  23 Cc: Christoph Hellwig <hch@lst.de>
  24 Cc: Hannes Reinecke <hare@suse.com>
  25 Cc: Johannes Thumshirn <jthumshirn@suse.de>
  26 Signed-off-by: Jens Axboe <axboe@kernel.dk>
  27 Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
  28 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  29 ---
  30  block/blk-core.c |    1 +
  31  1 file changed, 1 insertion(+)
  32
  33 --- a/block/blk-core.c
  34 +++ b/block/blk-core.c
  35 @@ -339,6 +339,7 @@ void blk_sync_queue(struct request_queue
  36                 struct blk_mq_hw_ctx *hctx;
  37                 int i;
  38
  39 +               cancel_delayed_work_sync(&q->requeue_work);
  40                 queue_for_each_hw_ctx(q, hctx, i)
  41                         cancel_delayed_work_sync(&hctx->run_work);
  42         } else {