Re: WARN @lib/refcount.c:128 during hot unplug of I/O adapter.

From	Sachin Sant <sachinp@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: WARN @lib/refcount.c:128 during hot unplug of I/O adapter.
Date	2017-04-07 06:40 +0200
Message-ID	<tttQJ-2j5-3@gated-at.bofh.it> (permalink)
References	<ttcPV-7fO-23@gated-at.bofh.it> <ttmvT-5Qi-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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> On 07-Apr-2017, at 2:14 AM, Tyrel Datwyler <tyreld@linux.vnet.ibm.com> wrote:
> 
> On 04/06/2017 03:27 AM, Sachin Sant wrote:
>> On a POWER8 LPAR running 4.11.0-rc5, a hot unplug operation on
>> any I/O adapter results in the following warning
> 
> I remember you mentioning this when the issue was brought up for CPUs. I
> assume the case is the same here where the issue is only seen with
> adapters that were hot-added after boot (ie. hot-remove of adapter
> present at boot doesn't trip the warning)?
> 

Correct, can be recreated only with adapters that were hot-added after boot.

> -Tyrel
> 
>> 
>> Thanks
>> -Sachin
>> 
>> 
>

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WARN @lib/refcount.c:128 during hot unplug of I/O adapter. Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-04-06 12:30 +0200
  Re: WARN @lib/refcount.c:128 during hot unplug of I/O adapter. Tyrel Datwyler <tyreld@linux.vnet.ibm.com> - 2017-04-06 22:50 +0200
    Re: WARN @lib/refcount.c:128 during hot unplug of I/O adapter. Michael Ellerman <mpe@ellerman.id.au> - 2017-04-07 06:10 +0200
    Re: WARN @lib/refcount.c:128 during hot unplug of I/O adapter. Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-04-07 06:40 +0200

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