linux-kernel - Re: [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks

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Message-ID: <20210621224119.GW4397@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 21 Jun 2021 15:41:19 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     syzbot <syzbot+7b2b13f4943374609532@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, andrii@...nel.org, ast@...nel.org,
        axboe@...nel.dk, bpf@...r.kernel.org, christian@...uner.io,
        coreteam@...filter.org, daniel@...earbox.net, davem@...emloft.net,
        dsahern@...nel.org, dvyukov@...gle.com, fw@...len.de,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        john.fastabend@...il.com, josh@...htriplett.org,
        kadlec@...filter.org, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        mathieu.desnoyers@...icios.com, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, pablo@...filter.org,
        peterz@...radead.org, rcu@...r.kernel.org, rostedt@...dmis.org,
        shakeelb@...gle.com, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yanfei.xu@...driver.com,
        yhs@...com, yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] KASAN: use-after-free Read in
 check_all_holdout_tasks_trace

On Sat, Jun 19, 2021 at 09:54:06AM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit f9006acc8dfe59e25aa75729728ac57a8d84fc32
> Author: Florian Westphal <fw@...len.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@...kaller.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()")

							Thanx, Paul