linux-kernel - UBSAN: Undefined behaviour in drivers/nvme/host/pci.c:456:17: division by zero

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Date:   Mon, 15 Jan 2018 13:53:12 +0100
From:   Paul Menzel <pmenzel+linux-nvme@...gen.mpg.de>
To:     Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        it+linux-nvme@...gen.mpg.de
Subject: UBSAN: Undefined behaviour in drivers/nvme/host/pci.c:456:17:
 division by zero

Dear Linux folks,

There is a regression from Linux 4.15-rc7 to 4.15-rc8+ causing undefined 
behavior sanitizer showing the error below. At least, I haven’t seen 
this error before.

```
UBSAN: Undefined behaviour in drivers/nvme/host/pci.c:456:17
division by zero
CPU: 0 PID: 53 Comm: kworker/u8:1 Not tainted 4.15.0-rc8+ #17
Hardware name: Notebook                         N24_25BU/N24_25BU, BIOS 
5.12 07/07/2017
Workqueue: nvme-wq nvme_reset_work
Call Trace:
  dump_stack+0x70/0xae
  ubsan_epilogue+0x9/0x40
  __ubsan_handle_divrem_overflow+0x99/0xe0
  ? nvme_queue_rq+0xd1a/0x14f0
  nvme_queue_rq+0xd1a/0x14f0
  ? ftrace_graph_caller+0x68/0x98
  ? trace_graph_entry+0xdc/0x2b0
  ? blk_mq_make_request+0xa70/0xa70
  ? blk_mq_sched_dispatch_requests+0x1f3/0x2e0
  blk_mq_dispatch_rq_list+0xb5/0xd50
  blk_mq_sched_dispatch_requests+0x1f3/0x2e0
  __blk_mq_delay_run_hw_queue+0x8f/0xd0
  blk_mq_run_hw_queue+0x2f/0xd0
  blk_mq_sched_insert_request+0x167/0x320
  blk_execute_rq+0x63/0xe0
  __nvme_submit_sync_cmd+0xa6/0x130
  nvme_set_features+0x67/0xd0
  nvme_set_queue_count+0x53/0x100
  nvme_reset_work+0x842/0x1ab0
  ? ftrace_graph_caller+0x68/0x98
  ? worker_thread+0x64/0x670
  ? prepare_ftrace_return+0xaa/0x170
  process_one_work+0x277/0x800
  worker_thread+0x64/0x670
  ? process_one_work+0x800/0x800
  kthread+0x173/0x230
  ? kthread+0x5/0x230
  ? kthread_create_worker_on_cpu+0x70/0x70
  ret_from_fork+0x32/0x40```

Kind regards,

Paul

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