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X-CSE-ConnectionGUID: EGUoShHFSt2Vz6STbjygAQ== X-CSE-MsgGUID: fpoxEqumQCCd++muGKlD7Q== X-IronPort-AV: E=McAfee;i="6700,10204,11308"; a="46988976" X-IronPort-AV: E=Sophos;i="6.12,296,1728975600"; d="scan'208";a="46988976" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jan 2025 13:28:15 -0800 X-CSE-ConnectionGUID: +WJu0zyARkS7wb0E8C7bdw== X-CSE-MsgGUID: HP4N/c+QTviPrxoVS0dyEA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="107983644" Received: from daliomra-mobl3.amr.corp.intel.com (HELO [10.124.221.86]) ([10.124.221.86]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jan 2025 13:28:14 -0800 Message-ID: <57af7a02-c765-409d-a04c-bf74e747f8b6@intel.com> Date: Tue, 7 Jan 2025 13:28:12 -0800 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: reproducible GPF error in native_tss_update_io_bitmap To: reveliofuzzing , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, kirill.shutemov@linux.intel.com Cc: x86@kernel.org, linux-kernel@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 1/6/25 18:32, reveliofuzzing wrote: > Hello, > > We found the following general protection fault bug in Linux kernel 6.12, and > it can be reproduced stably in a QEMU VM. To our knowledge, this problem has not > been observed by SyzBot so we would like to report it for your reference. > > - dmesg > syzkaller login: [ 90.849309] Oops: general protection fault, > probably for non-canonical address 0xdffffc0000000000: 0000 [#1] > PREEMPTI > [ 90.853735] KASAN: null-ptr-deref in range > [0x0000000000000000-0x0000000000000007] > [ 90.856772] CPU: 0 PID: 3265 Comm: iou-sqp-3264 Not tainted 6.10.0 #2 > [ 90.859386] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > BIOS 1.13.0-1ubuntu1.1 04/01/2014 > [ 90.862774] RIP: 0010:native_tss_update_io_bitmap+0x143/0x510 The whole thing looks like an issue in the failure path when trying to create an io_uring io worker thread. It's probably some confusion in treating the worker thread like a userspace thread with an io bitmap when the worker thread doesn't have one. It's _probably_ only reproducible with io_uring. It's arguable whether it's likely an x86 issue or an io_uring issue. In any case, running: scripts/decode_stacktrace.sh and providing a full vmlinux might be helpful if folks want to dig into this more.