netdev - Re: general protection fault in xsk_map_update

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Message-ID: <20190923225050.GA26406@pc-63.home>
Date:   Tue, 24 Sep 2019 00:50:50 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+491c1b7565ba9069ecae@...kaller.appspotmail.com>
Cc:     ast@...nel.org, bjorn.topel@...el.com, bpf@...r.kernel.org,
        davem@...emloft.net, hawk@...nel.org, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, jonathan.lemon@...il.com, kafai@...com,
        linux-kernel@...r.kernel.org, magnus.karlsson@...el.com,
        netdev@...r.kernel.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: general protection fault in xsk_map_update_elem

On Mon, Sep 23, 2019 at 08:49:11AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    b41dae06 Merge tag 'xfs-5.4-merge-7' of git://git.kernel.o..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=130b25ad600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=dfcf592db22b9132
> dashboard link: https://syzkaller.appspot.com/bug?extid=491c1b7565ba9069ecae
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=155a0c29600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=172bf6d9600000
> 
> The bug was bisected to:
> 
> commit 0402acd683c678874df6bdbc23530ca07ea19353
> Author: Björn Töpel <bjorn.topel@...el.com>
> Date:   Thu Aug 15 09:30:13 2019 +0000
> 
>     xsk: remove AF_XDP socket from map when the socket is released

Bjorn, PTAL, thanks.