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Fri, 14 May 2021 10:58:01 +0800 Received: from RTEXDAG02.realtek.com.tw (172.21.6.101) by RTEXH36502.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Fri, 14 May 2021 10:58:01 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXDAG02.realtek.com.tw (172.21.6.101) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Fri, 14 May 2021 10:58:00 +0800 Received: from RTEXMBS04.realtek.com.tw ([fe80::1d8:ba7d:61ca:bd74]) by RTEXMBS04.realtek.com.tw ([fe80::1d8:ba7d:61ca:bd74%5]) with mapi id 15.01.2106.013; Fri, 14 May 2021 10:58:00 +0800 From: Hayes Wang To: Alan Stern CC: syzbot , "davem@davemloft.net" , "kuba@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" , "netdev@vger.kernel.org" , "syzkaller-bugs@googlegroups.com" , nic_swsd Subject: RE: [syzbot] WARNING in rtl8152_probe Thread-Topic: [syzbot] WARNING in rtl8152_probe Thread-Index: AQHXRxMNo04dZcfiN0eNJrSRsQsh6qrguwNggAA4ewCAAVQHMA== Date: Fri, 14 May 2021 02:58:00 +0000 Message-ID: References: <0000000000009df1b605c21ecca8@google.com> <7de0296584334229917504da50a0ac38@realtek.com> <20210513142552.GA967812@rowland.harvard.edu> In-Reply-To: <20210513142552.GA967812@rowland.harvard.edu> Accept-Language: zh-TW, en-US Content-Language: zh-TW X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.21.177.203] x-kse-serverinfo: RTEXDAG02.realtek.com.tw, 9 x-kse-antivirus-interceptor-info: scan successful x-kse-antivirus-info: =?us-ascii?Q?Clean,_bases:_2021/5/13_=3F=3F_08:28:00?= x-kse-attachment-filter-triggered-rules: Clean x-kse-attachment-filter-triggered-filters: Clean x-kse-bulkmessagesfiltering-scan-result: protection disabled Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-KSE-AntiSpam-Outbound-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 05/14/2021 02:35:20 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 0 X-KSE-AntiSpam-Info: Lua profiles 163648 [May 13 2021] X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: hayeswang@realtek.com X-KSE-AntiSpam-Info: LuaCore: 445 445 d5f7ae5578b0f01c45f955a2a751ac25953290c9 X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;realtek.com:7.1.1 X-KSE-AntiSpam-Info: Rate: 0 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 05/14/2021 02:38:00 X-KSE-ServerInfo: RTEXH36502.realtek.com.tw, 9 X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-AntiSpam-Outbound-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 05/14/2021 02:45:24 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 0 X-KSE-AntiSpam-Info: Lua profiles 163648 [May 13 2021] X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: hayeswang@realtek.com X-KSE-AntiSpam-Info: LuaCore: 445 445 d5f7ae5578b0f01c45f955a2a751ac25953290c9 X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;realtek.com:7.1.1 X-KSE-AntiSpam-Info: Rate: 0 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 05/14/2021 02:48:00 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Alan Stern > Sent: Thursday, May 13, 2021 10:26 PM [...] > Syzbot doesn't test real devices. It tests emulations, and the emulated > devices usually behave very strangely and in very peculiar and > unexpected ways, so as to trigger bugs in the kernel. That's why the > USB devices you see in syzbot logs usually have bizarre descriptors. Do you mean I have to debug for a device which doesn't exist? I don't understand why I must consider a fake device which provide unexpected USB descriptor deliberately? Best Regards, Hayes