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AJvYcCVKI4I13ojLPA3z1xZQjWzoAlmg7htSlW/g4VqZH200Ie5Qp/X/lTNddWtbYElDb2j5cAnfLbJPj6cH8r8=@vger.kernel.org X-Gm-Message-State: AOJu0YyO0GDqAisXxtk5wKNAhFdmFMbYAGFp37CHd4s/APp/E+RYmhB/ fUfZ7QDeKprtvi8bWgg9uNJyZ6XgVEzihhAAOJyy6B1CP6I65xEQo0pk1U5y2G0Mj91Pa/C0IzZ B X-Google-Smtp-Source: AGHT+IHLpub98hIc5Ob5qa2Hr81nP7l6zY7EVcC34hBKOI7yvtg50A5KLJh78bJSKCuqb8kGAeSA5A== X-Received: by 2002:a17:907:3e0a:b0:a99:3c32:b538 with SMTP id a640c23a62f3a-a998d32b805mr520152866b.42.1728554447571; Thu, 10 Oct 2024 03:00:47 -0700 (PDT) Received: from [192.168.0.245] ([62.73.69.208]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a99a7ec54c1sm67001166b.10.2024.10.10.03.00.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Oct 2024 03:00:47 -0700 (PDT) Message-ID: <879c5998-cd65-473d-962a-7f4442979ab4@blackwall.org> Date: Thu, 10 Oct 2024 13:00:45 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [apparmor?] [ext4?] INFO: rcu detected stall in sys_getdents64 To: Tetsuo Handa , syzbot , linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Network Development References: <6707499c.050a0220.1139e6.0017.GAE@google.com> <7fbdb7db-57c3-47b8-89ed-da974d03f17f@I-love.SAKURA.ne.jp> Content-Language: en-US From: Nikolay Aleksandrov In-Reply-To: <7fbdb7db-57c3-47b8-89ed-da974d03f17f@I-love.SAKURA.ne.jp> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/10/2024 12:48, Tetsuo Handa wrote: > This is a printk() flooding problem in bridge driver. Should consider using ratelimit. > > #syz set subsystems: net > It should already be ratelimited, the code that prints is: if (net_ratelimit()) br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", source->dev->name, addr, vid); Cheers, Nik > On 2024/10/10 12:27, syzbot wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: fc20a3e57247 Merge tag 'for-linus-6.12a-rc2-tag' of git://.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=1083b380580000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=ba92623fdea824c9 >> dashboard link: https://syzkaller.appspot.com/bug?extid=17bc8c5157022e18da8b >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135f7d27980000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1483b380580000 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/2ad9af7b84b4/disk-fc20a3e5.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/1afa462ca485/vmlinux-fc20a3e5.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/75c0900b4786/bzImage-fc20a3e5.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+17bc8c5157022e18da8b@syzkaller.appspotmail.com >> >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: >> rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5244/1:b..l >> rcu: (detected by 1, t=10503 jiffies, g=5253, q=1466 ncpus=2) >> task:syz-executor116 state:R running task stack:18800 pid:5244 tgid:5244 ppid:5243 flags:0x00000002 > (...snipped...) >> net_ratelimit: 33488 callbacks suppressed >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) >> bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) > >