* Re: [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace
[not found] <000000000000f034fc05c2da6617@google.com>
@ 2021-06-19 16:54 ` syzbot
2021-06-21 22:41 ` Paul E. McKenney
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2021-06-19 16:54 UTC (permalink / raw)
To: akpm, andrii, ast, axboe, bpf, christian, coreteam, daniel, davem,
dsahern, dvyukov, fw, jiangshanlai, joel, john.fastabend, josh,
kadlec, kafai, kpsingh, kuba, linux-kernel, mathieu.desnoyers,
netdev, netfilter-devel, pablo, paulmck, peterz, rcu, rostedt,
shakeelb, songliubraving, syzkaller-bugs, yanfei.xu, yhs,
yoshfuji
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace
2021-06-19 16:54 ` [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace syzbot
@ 2021-06-21 22:41 ` Paul E. McKenney
2021-06-28 8:43 ` Dmitry Vyukov
0 siblings, 1 reply; 3+ messages in thread
From: Paul E. McKenney @ 2021-06-21 22:41 UTC (permalink / raw)
To: syzbot
Cc: akpm, andrii, ast, axboe, bpf, christian, coreteam, daniel, davem,
dsahern, dvyukov, fw, jiangshanlai, joel, john.fastabend, josh,
kadlec, kafai, kpsingh, kuba, linux-kernel, mathieu.desnoyers,
netdev, netfilter-devel, pablo, peterz, rcu, rostedt, shakeelb,
songliubraving, syzkaller-bugs, yanfei.xu, yhs, yoshfuji
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()")
Thanx, Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace
2021-06-21 22:41 ` Paul E. McKenney
@ 2021-06-28 8:43 ` Dmitry Vyukov
0 siblings, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2021-06-28 8:43 UTC (permalink / raw)
To: paulmck
Cc: syzbot, akpm, andrii, ast, axboe, bpf, christian, coreteam,
daniel, davem, dsahern, fw, jiangshanlai, joel, john.fastabend,
josh, kadlec, kafai, kpsingh, kuba, linux-kernel,
mathieu.desnoyers, netdev, netfilter-devel, pablo, peterz, rcu,
rostedt, shakeelb, songliubraving, syzkaller-bugs, yanfei.xu, yhs,
yoshfuji
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()
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <000000000000f034fc05c2da6617@google.com>
2021-06-19 16:54 ` [syzbot] KASAN: use-after-free Read in check_all_holdout_tasks_trace syzbot
2021-06-21 22:41 ` Paul E. McKenney
2021-06-28 8:43 ` Dmitry Vyukov
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