On 01/13/15 15:18, Mike Snitzer wrote:
> On Tue, Jan 13 2015 at 7:29am -0500,
> Bart Van Assche <bart.vanassche@xxxxxxxxxxx> wrote:
>> However, I hit another issue while running I/O on top of a multipath
>> device (on a kernel with lockdep and SLUB memory poisoning enabled):
>>
>> NMI watchdog: BUG: soft lockup - CPU#7 stuck for 23s! [kdmwork-253:0:3116]
>> CPU: 7 PID: 3116 Comm: kdmwork-253:0 Tainted: G W 3.19.0-rc4-debug+ #1
>> Call Trace:
>> [<ffffffff8118e4be>] kmem_cache_alloc+0x28e/0x2c0
>> [<ffffffff81346aca>] alloc_iova_mem+0x1a/0x20
>> [<ffffffff81342c8e>] alloc_iova+0x2e/0x250
>> [<ffffffff81344b65>] intel_alloc_iova+0x95/0xd0
>> [<ffffffff81348a15>] intel_map_sg+0xc5/0x260
>> [<ffffffffa07e0661>] srp_queuecommand+0xa11/0xc30 [ib_srp]
>> [<ffffffffa001698e>] scsi_dispatch_cmd+0xde/0x5a0 [scsi_mod]
>> [<ffffffffa0017480>] scsi_queue_rq+0x630/0x700 [scsi_mod]
>> [<ffffffff8125683d>] __blk_mq_run_hw_queue+0x1dd/0x370
>> [<ffffffff81256aae>] blk_mq_alloc_request+0xde/0x150
>> [<ffffffff8124bade>] blk_get_request+0x2e/0xe0
>> [<ffffffffa07ebd0f>] __multipath_map.isra.15+0x1cf/0x210 [dm_multipath]
>> [<ffffffffa07ebd6a>] multipath_clone_and_map+0x1a/0x20 [dm_multipath]
>> [<ffffffffa044abb5>] map_tio_request+0x1d5/0x3a0 [dm_mod]
>> [<ffffffff81075d16>] kthread_worker_fn+0x86/0x1b0
>> [<ffffffff81075c0f>] kthread+0xef/0x110
>> [<ffffffff814db42c>] ret_from_fork+0x7c/0xb0
>
> Unfortunate. Is this still with a 16MB backing device or is it real
> hardware? Can you share the workload so that myself and/or Keith could
> try to reproduce?
Hello Mike,
This is still with a 16MB RAM disk as backing device. The fio job I
used to trigger this was as follows:
dev=/dev/sdc
fio --bs=4K --ioengine=libaio --rw=randread --buffered=0 --numjobs=12 \
--iodepth=128 --iodepth_batch=64 --iodepth_batch_complete=64 \
--thread --norandommap --loops=$((2**31)) --runtime=60 \
--group_reporting --gtod_reduce=1 --name=$dev --filename=$dev \
--invalidate=1
Bart.
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