linux-kernel - Re: [BUG BISECT] bug mm/vmalloc.c:470 (mm/vmalloc.c: get rid of one single unlink

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Message-ID: <CAPKp9uauCeYi-ArurSHytpBR4_XXJX6jfG2RqoMo0dpNGyTb5w@mail.gmail.com>
Date:   Mon, 3 Jun 2019 15:12:55 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Hillf Danton <hdanton@...a.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tejun Heo <tj@...nel.org>, Andrei Vagin <avagin@...il.com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [BUG BISECT] bug mm/vmalloc.c:470 (mm/vmalloc.c: get rid of one
 single unlink_va() when merge)

Hi,

On Mon, Jun 3, 2019 at 3:02 PM Uladzislau Rezki <urezki@...il.com> wrote:
>
> Hello, Krzysztof.
>
> On Mon, Jun 03, 2019 at 11:07:46AM +0200, Krzysztof Kozlowski wrote:
> > Hi,
> >
> > On recent next I see bugs during boot (after bringing up user-space or
> > during reboot):
> > kernel BUG at ../mm/vmalloc.c:470!

I was about to report the same and saw this thread.

> > On all my boards. On QEMU I see something similar, although the
> > message is "Internal error: Oops - undefined instruction: 0 [#1] ARM",
> >
> > The calltrace is:
> > [   34.565126] [<c0275c9c>] (__free_vmap_area) from [<c0276044>]
> > (__purge_vmap_area_lazy+0xd0/0x170)
> > [   34.573963] [<c0276044>] (__purge_vmap_area_lazy) from [<c0276d50>]
> > (_vm_unmap_aliases+0x1fc/0x244)
> > [   34.582974] [<c0276d50>] (_vm_unmap_aliases) from [<c0279500>]
> > (__vunmap+0x170/0x200)
> > [   34.590770] [<c0279500>] (__vunmap) from [<c01d5a70>]
> > (do_free_init+0x40/0x5c)
> > [   34.597955] [<c01d5a70>] (do_free_init) from [<c01478f4>]
> > (process_one_work+0x228/0x810)
> > [   34.606018] [<c01478f4>] (process_one_work) from [<c0147f0c>]
> > (worker_thread+0x30/0x570)
> > [   34.614077] [<c0147f0c>] (worker_thread) from [<c014e8b4>]
> > (kthread+0x134/0x164)
> > [   34.621438] [<c014e8b4>] (kthread) from [<c01010b4>]
> > (ret_from_fork+0x14/0x20)
> >
> > Full log here:
> > https://krzk.eu/#/builders/1/builds/3356/steps/14/logs/serial0
> > https://krzk.eu/#/builders/22/builds/1118/steps/35/logs/serial0
> >
> > Bisect pointed to:
> > 728e0fbf263e3ed359c10cb13623390564102881 is the first bad commit
> > commit 728e0fbf263e3ed359c10cb13623390564102881
> > Author: Uladzislau Rezki (Sony) <urezki@...il.com>
> > Date:   Sat Jun 1 12:20:19 2019 +1000
> >     mm/vmalloc.c: get rid of one single unlink_va() when merge
> >
> I have checked the linux-next. I can confirm it happens because of:
>  mm/vmalloc.c: get rid of one single unlink_va() when merge
>
> The problem is that, it has been applied wrongly into linux-next tree
> for some reason, i do not why. Probably due to the fact that i based
> my work on 5.1/2-rcX, whereas linux-next is a bit ahead of it. If so,
> sorry for that.
>
> See below the clean patch for remotes/linux-next/master:
>

This patch fixes the issue and resumes booting on my platform.

--
Regards,
Sudeep