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

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Message-ID: <20190520070317.GU6836@dhcp22.suse.cz>
Date:   Mon, 20 May 2019 09:03:17 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
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 17-05-19 13:33:25, Pavel Tatashin wrote:
> On Fri, May 17, 2019 at 1:24 PM Pavel Tatashin
> <pasha.tatashin@...een.com> wrote:
> >
> > 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.
> 
> OK, confirmed on 5.0 as well, took 4 tries to reproduce:

What is the last version that survives? Can you bisect?
-- 
Michal Hocko
SUSE Labs