Re: [PATCH 0/2] sd: Fix a deadlock between event checking and device removal

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2016-11-14 19:35 GMT+01:00 Bart Van Assche <bart.vanassche@xxxxxxxxxxx>:
> On 11/12/2016 09:47 PM, James Bottomley wrote:
>>
>> On Fri, 2016-11-11 at 16:38 -0800, Bart Van Assche wrote:
>>>
>>> Hello James and Martin,
>>>
>>> This short patch series fixes a deadlock that I ran into for the
>>> first time several months ago but for which I had not yet had the
>>> time to post a fix. As usual, feedback is appreciated.
>>
>>
>> First question would be why do we need to push highly dm specific
>> knowledge into block, like REQ_FAIL_IF_NO_PATH.  Can't we just use
>> REQ_FAILFAST_X for this?
>>
>> Also, I don't quite understand how you've configured multipath
>> underneath SCSI.  I thought dm-mp always went on top?
>
>
> Hello James,
>
> dm-multipath was running on top of SCSI in my setup which means that at
> least the patch description is wrong. Since it was some time ago that I ran
> into this deadlock, I will check first whether I can still reproduce it.
>
> Bart.

Hi Bart,

I suspect we run into same bug you were trying to fix in this patch
set. we're running in v4.4.50

I was trying to reproduce it, but no lucky yet, do you still have your
reproducer?

Thanks,
Jack


>
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