Re: Fwd: [powerpc/Baremetal]Kernel OOPS while executing memory hotplug on Power8 baremetal

From: Bart Van Assche <Bart.VanAssche@wdc.com>
To: "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"vrbagal1@linux.vnet.ibm.com" <vrbagal1@linux.vnet.ibm.com>
Cc: "sachinp@linux.vnet.ibm.com" <sachinp@linux.vnet.ibm.com>
Subject: Re: Fwd: [powerpc/Baremetal]Kernel OOPS while executing memory hotplug on Power8 baremetal
Date: Thu, 7 Jun 2018 07:42:51 +0000	[thread overview]
Message-ID: <042fc8ee69b74c57815c0edfdbb253495e9d7718.camel@wdc.com> (raw)
In-Reply-To: <d011631b-c667-2628-dda8-2c87961329f0@linux.vnet.ibm.com>

On Thu, 2018-06-07 at 12:56 +0530, Venkat Rao B wrote:
> On Thursday 07 June 2018 12:46 PM, Bart Van Assche wrote:
> > On Thu, 2018-06-07 at 12:38 +0530, vrbagal1 wrote:
> > > Observing Kernel oops and machine reboots while executing memory hotplug
> > > test case, on Power8 Baremetal machine.
> > > 
> > > I see this is introduced some where between rc6 and 4.17.
> > 
> > Please provide the exact versions (git commit IDs) of the kernel versions
> > you have tested.
> 
> Commit Id ---> 5037be168f

The reason I was asking for the commit ID is because I saw that clone_endio()
occurs in the oops which means that the dm driver is involved. An important fix
for the dm driver went upstream recently, namely d37753540568 ("dm: Use kzalloc
for all structs with embedded biosets/mempools"). Can you double check whether
that commit it present in your tree? If it is not present, please update to the
latest master and retest. If it is present, please report how to reproduce
this oops to Kent Overstreet, Jens Axboe, linux-block and Mike Snitzer.

Thanks,

Bart.