linux-kernel - Re: linux-next test error: WARNING: suspicious RCU usage in ipmr_device

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Date:   Thu, 23 Apr 2020 10:49:38 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Qian Cai <cai@....pw>
Cc:     syzbot <syzbot+21f82f61c24a7295edf5@...kaller.appspotmail.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        David Miller <davem@...emloft.net>, kuba@...nel.org,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: linux-next test error: WARNING: suspicious RCU usage in ipmr_device_event

On Tue, Apr 21, 2020 at 1:21 PM Qian Cai <cai@....pw> wrote:
> > On Apr 21, 2020, at 6:51 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> >
> > +linux-next, Stephen for a new linux-next breakage
>
> I don’t know why you keep sending the same thing over and over again where I replied you just two days ago for the same thing.

Well, formally this bug was never mailed. The other one is about
"WARNING: suspicious RCU usage in ovs_ct_exit". It just happened that
this "WARNING: suspicious RCU usage in ipmr_device_event" was appended
to that one (because kernel somehow failed to respect panic_on_warn?).
But warnings except the first one are ignored, frequently they are
induced and it's not possible to track 2 different bugs at the same
time in a reasonable way anyway.

So effectively this is the first occurance of this bug (presumably the
fix for ovs_ct_exit has reached linux-next). First occurrence is
always mailed.

Now let's tell syzbot that this one is fixed as well:

#syz fix: ipmr: Fix RCU list debugging warning