linux-kernel - Re: kernel BUG at mm/vmalloc.c:LINE! (2)

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Date:   Thu, 23 Jul 2020 19:50:29 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Qian Cai <cai@....pw>, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        luto@...nel.org, mingo@...hat.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        x86@...nel.org, sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        lpf.vector@...il.com, Uladzislau Rezki <urezki@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Pengfei Li <lpf.vector@...il.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Michal Hocko <mhocko@...nel.org>,
        Yafang Shao <laoar.shao@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Matthew Wilcox <willy@...radead.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Joerg Roedel <jroedel@...e.de>, Roman Gushchin <guro@...com>,
        Dennis Zhou <dennis@...nel.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: kernel BUG at mm/vmalloc.c:LINE! (2)

On Wed, 22 Jul 2020 16:46:50 +0200 Uladzislau Rezki <urezki@...il.com> wrote:

> > > I can check further, but it can be it was not correctly reverted,
> > > because everything should work just fine even with the revert,
> > > though i i do not understand a reason of reverting.
> > 
> > Vlad, how sure are you about this? We also start to trigger this now on
> > linux-next, but the reverting patch surely looks like doggy without any useful
> > information in the commit description.
> >
> Hello, Andrew, Qian.
> 
> I am not aware of reason of the revert, though i tried to get through Ingo.
> I can send out a patch that fixes the revert. Another option to drop the
> revert, but it is up to Andrew and Ingo.
> 
> Andrew, could you please comment on?

All a bit mysterious.  I think it's best that we revert this from
linux-next until we hear from Ingo.  I queued a patch - I expect
Stephen will see and grab it, thanks.