linux-kernel - Re: BUG at mm/vmalloc.c:3089! - invalid opcode: 0000 [#1] SMP KASAN PTI

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Message-ID: <CALvZod5cBTsytQz5=EbqT_s1_ZJ8YpkBe+CLEAU+25FP4kHSAg@mail.gmail.com>
Date:   Wed, 22 Jul 2020 09:16:57 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, lkft-triage@...ts.linaro.org,
        LTP List <ltp@...ts.linux.it>,
        Cgroups <cgroups@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Yafang Shao <laoar.shao@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        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>
Subject: Re: BUG at mm/vmalloc.c:3089! - invalid opcode: 0000 [#1] SMP KASAN PTI

On Wed, Jul 22, 2020 at 1:55 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> Adding Roman Gushchin to Cc, he touched that code recently.
>
> Naresh, if nobody has any immediate ideas, you could double-check by
> reverting these commits:
>
> e0b8d00b7561 mm: memcg/percpu: per-memcg percpu memory statistics
> 99411af13595 mm/percpu: fix 'defined but not used' warning
> 9398ce6306b6 mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix-fix
> 54116d471779 mm-memcg-percpu-account-percpu-memory-to-memory-cgroups-fix
> ec518e090843 mm: memcg/percpu: account percpu memory to memory cgroups
> 9bc897d18dc3 percpu: return number of released bytes from pcpu_free_area()
>
>        Arnd
>

I think syzbot has bisected this issue to the suspect patch.

https://lore.kernel.org/lkml/00000000000043f09405ab01b0b8@google.com/