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

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Message-ID: <CACT4Y+a3Xe11dAkRAAewXQ7b=KzK1pk36Arwq=vCR7R-KQy9DQ@mail.gmail.com>
Date:   Mon, 11 Jan 2021 10:15:58 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+5f326d255ca648131f87@...kaller.appspotmail.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, andrii@...nel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Borislav Petkov <bp@...en8.de>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        John Fastabend <john.fastabend@...il.com>,
        jonathan.lemon@...il.com, Martin KaFai Lau <kafai@...com>,
        KP Singh <kpsingh@...omium.org>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, Andy Lutomirski <luto@...nel.org>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        marekx.majtyka@...el.com, Ingo Molnar <mingo@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Yonghong Song <yhs@...com>
Subject: Re: kernel BUG at mm/vmalloc.c:LINE! (2)

On Sun, Jan 10, 2021 at 10:34 PM syzbot
<syzbot+5f326d255ca648131f87@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 537cf4e3cc2f6cc9088dcd6162de573f603adc29
> Author: Magnus Karlsson <magnus.karlsson@...el.com>
> Date:   Fri Nov 20 11:53:39 2020 +0000
>
>     xsk: Fix umem cleanup bug at socket destruct
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=139f3dfb500000
> start commit:   e87d24fc Merge branch 'net-iucv-fixes-2020-11-09'
> git tree:       net
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61033507391c77ff
> dashboard link: https://syzkaller.appspot.com/bug?extid=5f326d255ca648131f87
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d10006500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=126c9eaa500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: xsk: Fix umem cleanup bug at socket destruct
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

FTR, the bisection log looks clean, but this does not look like the
fix for this. The reproducer does not destroy sockets.