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[73.241.217.19]) by smtp.gmail.com with ESMTPSA id x17sm4211846pff.62.2019.08.15.18.42.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Aug 2019 18:42:12 -0700 (PDT) Subject: Re: WARNING in is_bpf_text_address To: Will Deacon , syzbot Cc: akpm@linux-foundation.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, dvyukov@google.com, hawk@kernel.org, hdanton@sina.com, jakub.kicinski@netronome.com, johannes.berg@intel.com, johannes@sipsolutions.net, john.fastabend@gmail.com, kafai@fb.com, linux-kernel@vger.kernel.org, longman@redhat.com, mingo@kernel.org, netdev@vger.kernel.org, paulmck@linux.vnet.ibm.com, peterz@infradead.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, tj@kernel.org, torvalds@linux-foundation.org, will.deacon@arm.com, xdp-newbies@vger.kernel.org, yhs@fb.com References: <00000000000000ac4f058bd50039@google.com> <000000000000e56cb0058fcc6c28@google.com> <20190815075142.vuza32plqtiuhixx@willie-the-truck> From: Bart Van Assche Message-ID: <456d0da6-3e16-d3fc-ecf6-7abb410bf689@acm.org> Date: Thu, 15 Aug 2019 18:39:56 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190815075142.vuza32plqtiuhixx@willie-the-truck> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 8/15/19 12:51 AM, Will Deacon wrote: > Hi Bart, > > On Sat, Aug 10, 2019 at 05:24:06PM -0700, syzbot wrote: >> syzbot has found a reproducer for the following crash on: >> >> HEAD commit: 451577f3 Merge tag 'kbuild-fixes-v5.3-3' of git://git.kern.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=120850a6600000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=2031e7d221391b8a >> dashboard link: https://syzkaller.appspot.com/bug?extid=bd3bba6ff3fcea7a6ec6 >> compiler: clang version 9.0.0 (/home/glider/llvm/clang >> 80fee25776c2fb61e74c1ecb1a523375c2500b69) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130ffe4a600000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17137d2c600000 >> >> The bug was bisected to: >> >> commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4 >> Author: Bart Van Assche >> Date: Thu Feb 14 23:00:46 2019 +0000 >> >> locking/lockdep: Free lock classes that are no longer in use >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=152f6a9da00000 >> final crash: https://syzkaller.appspot.com/x/report.txt?x=172f6a9da00000 >> console output: https://syzkaller.appspot.com/x/log.txt?x=132f6a9da00000 > > I know you don't think much to these reports, but please could you have a > look (even if it's just to declare it a false positive)? Hi Will, Had you already noticed the following message? https://lore.kernel.org/bpf/d76d7a63-7854-e92d-30cb-52546d333ffe@iogearbox.net/ From that message: "Hey Bart, don't think it's related in any way to your commit. I'll allocate some time on working on this issue today, thanks!" Bart.