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From: John Fastabend <john.fastabend@gmail.com>
To: syzbot <syzbot+320a3bc8d80f478c37e4@syzkaller.appspotmail.com>,
	akpm@linux-foundation.org, andrii@kernel.org, anton@tuxera.com,
	ast@kernel.org, bp@alien8.de, bpf@vger.kernel.org,
	daniel@iogearbox.net, davem@davemloft.net, hpa@zytor.com,
	jakub@cloudflare.com, jmattson@google.com,
	john.fastabend@gmail.com, joro@8bytes.org, kafai@fb.com,
	kpsingh@kernel.org, kuba@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, lmb@cloudflare.com,
	mingo@redhat.com, netdev@vger.kernel.org, pbonzini@redhat.com,
	rkovhaev@gmail.com, seanjc@google.com, songliubraving@fb.com,
	syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
	torvalds@linux-foundation.org, vkuznets@redhat.com,
	wanpengli@tencent.com, x86@kernel.org, yhs@fb.com
Subject: RE: [syzbot] WARNING: suspicious RCU usage in tcp_bpf_update_proto
Date: Tue, 06 Apr 2021 11:21:37 -0700	[thread overview]
Message-ID: <606ca6b12f544_f0242081@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <0000000000008872ff05bf40e4db@google.com>

syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    514e1150 net: x25: Queue received packets in the drivers i..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=112a8831d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f
> dashboard link: https://syzkaller.appspot.com/bug?extid=320a3bc8d80f478c37e4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1532d711d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f44c5ed00000
> 
> The issue was bisected to:
> 
> commit 4dfe6bd94959222e18d512bdf15f6bf9edb9c27c
> Author: Rustam Kovhaev <rkovhaev@gmail.com>
> Date:   Wed Feb 24 20:00:30 2021 +0000
> 
>     ntfs: check for valid standard information attribute
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16207a81d00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=15207a81d00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11207a81d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+320a3bc8d80f478c37e4@syzkaller.appspotmail.com
> Fixes: 4dfe6bd94959 ("ntfs: check for valid standard information attribute")
> 
> =============================
> WARNING: suspicious RCU usage
> 5.12.0-rc4-syzkaller #0 Not tainted
> -----------------------------
> include/linux/skmsg.h:286 suspicious rcu_dereference_check() usage!
> 
> other info that might help us debug this:
> 
> 
> rcu_scheduler_active = 2, debug_locks = 1
> 1 lock held by syz-executor383/8454:
>  #0: ffff888013a99b48 (clock-AF_INET){++..}-{2:2}, at: sk_psock_drop+0x2c/0x460 net/core/skmsg.c:788
> 
> stack backtrace:
> CPU: 1 PID: 8454 Comm: syz-executor383 Not tainted 5.12.0-rc4-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:79 [inline]
>  dump_stack+0x141/0x1d7 lib/dump_stack.c:120
>  sk_psock include/linux/skmsg.h:286 [inline]
>  tcp_bpf_update_proto+0x530/0x5f0 net/ipv4/tcp_bpf.c:504
>  sk_psock_restore_proto include/linux/skmsg.h:408 [inline]
>  sk_psock_drop+0xdf/0x460 net/core/skmsg.c:789
>  sk_psock_put include/linux/skmsg.h:446 [inline]
>  tcp_bpf_recvmsg+0x42d/0x480 net/ipv4/tcp_bpf.c:208


The bisection is bogus, but we will get a fix for this ASAP. The real commit
is,

commit 8a59f9d1e3d4340659fdfee8879dc09a6f2546e1
Author: Cong Wang <cong.wang@bytedance.com>
Date:   Tue Mar 30 19:32:31 2021 -0700

    sock: Introduce sk->sk_prot->psock_update_sk_prot()

Thanks,
John

      parent reply	other threads:[~2021-04-06 18:21 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-05 22:05 [syzbot] WARNING: suspicious RCU usage in tcp_bpf_update_proto syzbot
2021-04-06 17:58 ` Cong Wang
2021-04-06 18:21 ` John Fastabend [this message]

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