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Mon, 02 Nov 2020 07:19:30 -0800 (PST) Subject: Re: KASAN: null-ptr-deref Write in kthread_use_mm To: syzbot , io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, will@kernel.org References: <00000000000008604f05b31e6867@google.com> From: Jens Axboe Message-ID: <298f1180-ab14-d08e-dcd2-3e4bbbc1e90a@kernel.dk> Date: Mon, 2 Nov 2020 08:19:29 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <00000000000008604f05b31e6867@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 11/2/20 4:54 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 4e78c578 Add linux-next specific files for 20201030 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=148969d4500000 > kernel config: https://syzkaller.appspot.com/x/.config?x=83318758268dc331 > dashboard link: https://syzkaller.appspot.com/bug?extid=b57abf7ee60829090495 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e1346c500000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1388fbca500000 > > The issue was bisected to: > > commit 4d004099a668c41522242aa146a38cc4eb59cb1e > Author: Peter Zijlstra > Date: Fri Oct 2 09:04:21 2020 +0000 > > lockdep: Fix lockdep recursion That bisection definitely isn't correct. But I'll take a look at the issue. -- Jens Axboe