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X-CSE-ConnectionGUID: mILWayW+Sve2C2WxFDwz7A== X-CSE-MsgGUID: pPAIlgkSSh+1vatbnBKkuA== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="28417642" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="28417642" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2024 16:40:50 -0700 X-CSE-ConnectionGUID: NGhGJtRhR2u8IqG/dxwaIg== X-CSE-MsgGUID: kp1WXvDfS6a7pkXsV3FfjQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,206,1725346800"; d="scan'208";a="78892355" Received: from mdroper-mobl2.amr.corp.intel.com (HELO [10.124.221.110]) ([10.124.221.110]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2024 16:40:48 -0700 Message-ID: <15c0859f-445f-4159-9b38-3af6d9a2a572@intel.com> Date: Tue, 15 Oct 2024 16:40:48 -0700 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: WARNING in get_pat_info To: Marius Fleischer , Jens Axboe Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , linux-kernel@vger.kernel.org, syzkaller@googlegroups.com, harrisonmichaelgreen@gmail.com, Pavel Begunkov , io-uring@vger.kernel.org References: From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/15/24 15:29, Marius Fleischer wrote: > Hi Jens, > Please find the config we used for testing the reproducer on v5.15.167 > - hope that helps. > > Which of the reproducers did you try? Upon more testing, it seems like the > C reproducer (repro.c) is a little unstable on v5.15.167 but repro.syz works > fine. Instructions on how to run repro.syz are here: > https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md FWIW, those instructions don't work if you don't have 'go' in your path already. Even when you do, it apparently needs to be a pretty recent version. They also say "Unpack it (a tarball) to $HOME/goroot". I read that as: mkdir $HOME/goroot cd $HOME/goroot tar -zxf $TARBALL When I think it really means something like: cd $HOME tar -zxf $TARBALL mv go goroot or something. I figured it out eventually, but it would be nice to make those instructions a _bit_ more clear, especially for folks that don't have a recent go toolchain already sitting around. Oh, and the go toolchain had a jolly old time beating up on my poor little 4GB-of-RAM test VM. I had to double its RAM just to compile this beast. > TL;DR compile syzkaller, copy syz-execprog, syz-executor, repro.syz into > the VM and run the command below inside the VM > ./syz-execprog -executor=./syz-executor -procs=8 -repeat=0 repro.syz > > Please let me know if you need more details from us! It didn't reproduce for me, either, at least ~10k executed programs in. How long should it take? The next step would be to figure out specifically why get_pat_info() failed. To double check that io_uring is the thing that's involved and (presumably) why follow_phys() failed. Basically, I think we need to know what state the page tables and the VMA were in.