From: Dmitry Vyukov <dvyukov@google.com>
To: paulmck@kernel.org
Cc: syzbot <syzbot+7b2b13f4943374609532@syzkaller.appspotmail.com>,
akpm@linux-foundation.org, andrii@kernel.org, ast@kernel.org,
axboe@kernel.dk, bpf@vger.kernel.org, christian@brauner.io,
coreteam@netfilter.org, daniel@iogearbox.net,
davem@davemloft.net, dsahern@kernel.org, fw@strlen.de,
jiangshanlai@gmail.com, joel@joelfernandes.org,
john.fastabend@gmail.com, josh@joshtriplett.org,
kadlec@netfilter.org, kafai@fb.com, kpsingh@kernel.org,
kuba@kernel.org, linux-kernel@vger.kernel.org,
mathieu.desnoyers@efficios.com, netdev@vger.kernel.org,
netfilter-devel@vger.kernel.org, pablo@netfilter.org,
peterz@infradead.org, rcu@vger.kernel.org, rostedt@goodmis.org,
shakeelb@google.com, songliubraving@fb.com,
syzkaller-bugs@googlegroups.com, yanfei.xu@windriver.com,
yhs@fb.com, yoshfuji@linux-ipv6.org
Subject: Re: [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace
Date: Mon, 28 Jun 2021 10:43:04 +0200 [thread overview]
Message-ID: <CACT4Y+bL26nyHU5Tc4SV7AepPYSt_YZVfhLEMaLncZ2+-OyFCg@mail.gmail.com> (raw)
In-Reply-To: <20210621224119.GW4397@paulmck-ThinkPad-P17-Gen-1>
On Tue, Jun 22, 2021 at 12:41 AM Paul E. McKenney <paulmck@kernel.org> wrote:
>
> On Sat, Jun 19, 2021 at 09:54:06AM -0700, syzbot wrote:
> > syzbot has bisected this issue to:
> >
> > commit f9006acc8dfe59e25aa75729728ac57a8d84fc32
> > Author: Florian Westphal <fw@strlen.de>
> > Date: Wed Apr 21 07:51:08 2021 +0000
> >
> > netfilter: arp_tables: pass table pointer via nf_hook_ops
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10dceae8300000
> > start commit: 0c38740c selftests/bpf: Fix ringbuf test fetching map FD
> > git tree: bpf-next
> > final oops: https://syzkaller.appspot.com/x/report.txt?x=12dceae8300000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14dceae8300000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=a6380da8984033f1
> > dashboard link: https://syzkaller.appspot.com/bug?extid=7b2b13f4943374609532
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1264c2d7d00000
> >
> > Reported-by: syzbot+7b2b13f4943374609532@syzkaller.appspotmail.com
> > Fixes: f9006acc8dfe ("netfilter: arp_tables: pass table pointer via nf_hook_ops")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> I am not seeing any mention of check_all_holdout_tasks_trace() in
> the console output, but I again suggest the following two patches:
>
> 6a04a59eacbd ("rcu-tasks: Don't delete holdouts within trc_inspect_reader()"
> dd5da0a9140e ("rcu-tasks: Don't delete holdouts within trc_wait_for_one_reader()")
Let's tell syzbot about these fixes, then it will tell us if they help or not.
#syz fix: rcu-tasks: Don't delete holdouts within trc_inspect_reader()
prev parent reply other threads:[~2021-06-28 8:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 17:29 [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace syzbot
2021-05-23 6:51 ` Dmitry Vyukov
2021-05-24 4:13 ` Paul E. McKenney
2021-05-24 22:46 ` Paul E. McKenney
2021-05-25 2:31 ` Xu, Yanfei
2021-05-25 3:33 ` Paul E. McKenney
2021-05-25 8:33 ` Dmitry Vyukov
2021-05-25 14:36 ` Paul E. McKenney
2021-05-25 10:24 ` Xu, Yanfei
2021-05-25 14:28 ` Paul E. McKenney
2021-05-26 2:22 ` Xu, Yanfei
2021-05-26 4:21 ` Paul E. McKenney
2021-05-26 6:03 ` Xu, Yanfei
2021-06-18 20:45 ` syzbot
2021-06-21 22:37 ` Paul E. McKenney
2021-06-19 16:54 ` syzbot
2021-06-21 22:41 ` Paul E. McKenney
2021-06-28 8:43 ` Dmitry Vyukov [this message]
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