linux-kernel - Re: NULL pointer dereference during memory hotremove

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Message-ID: <CA+CK2bDq+2qu28afO__4kzO4=cnLH1P4DcHjc62rt0UtYwLm0A@mail.gmail.com>
Date:   Fri, 17 May 2019 13:24:50 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "tiwai@...e.de" <tiwai@...e.de>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "david@...hat.com" <david@...hat.com>, "bp@...e.de" <bp@...e.de>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "zwisler@...nel.org" <zwisler@...nel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "Busch, Keith" <keith.busch@...el.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Wu, Fengguang" <fengguang.wu@...el.com>,
        "baiyaowei@...s.chinamobile.com" <baiyaowei@...s.chinamobile.com>
Subject: Re: NULL pointer dereference during memory hotremove

On Fri, May 17, 2019 at 1:22 PM Pavel Tatashin
<pasha.tatashin@...een.com> wrote:
>
> On Fri, May 17, 2019 at 10:38 AM Michal Hocko <mhocko@...nel.org> wrote:
> >
> > On Fri 17-05-19 10:20:38, Pavel Tatashin wrote:
> > > This panic is unrelated to circular lock issue that I reported in a
> > > separate thread, that also happens during memory hotremove.
> > >
> > > xakep ~/x/linux$ git describe
> > > v5.1-12317-ga6a4b66bd8f4
> >
> > Does this happen on 5.0 as well?
>
> Yes, just reproduced it on 5.0 as well. Unfortunately, I do not have a
> script, and have to do it manually, also it does not happen every
> time, it happened on 3rd time for me.

Actually, sorry, I have not tested 5.0, I compiled 5.0, but my script
still tested v5.1-12317-ga6a4b66bd8f4 build. I will report later if I
am able to reproduce it on 5.0.

Pasha