From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C8D8C74A21 for ; Wed, 10 Jul 2019 13:48:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 79FB320651 for ; Wed, 10 Jul 2019 13:48:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727707AbfGJNsH (ORCPT ); Wed, 10 Jul 2019 09:48:07 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:45019 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727102AbfGJNsH (ORCPT ); Wed, 10 Jul 2019 09:48:07 -0400 Received: by mail-io1-f70.google.com with SMTP id s9so2936125iob.11 for ; Wed, 10 Jul 2019 06:48:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=LT8iUgbAX2xL+AtAgDIDYxrRzDLm9I/6tbMydcV9JCo=; b=KTByEz8P/jKzZZ8hYLa829OhxxAA2zpOVerr64EHPX9X2RacmNHzd8zRVSBzjFiEf8 3SOer9lAIwABCf7ekzahO++m2dXSbQDcoOol83plQoZqIyKdERRjzm1cj9FkGZKgp+q/ Q6TP2gZL0AtLq6Kjfqgv1oIQz496Q3P5NZxPcoCoFVOQ9lSmUWO0c4pP+FjiZS2mLM/z X30nqQzx96+MUcgev9p+4hoCIx7kkdX37ZfLu/sMEFkWGWz5wZsb5g9y/QKSluY2nVRS JmZowuTLS16rkcwQ2EgObUAHpjKyxtvKuF45iy7GAdbNUQQNV8UgG6KE/bPJ0l7JMgJc jT8A== X-Gm-Message-State: APjAAAWgvdikmTmpJwMr0pb1J2cAqEB74K8LyXEOfrIwsxSOn70hRdSX dm57B1F0XUMIMU+fpsfS1dEtogr7+uRFreSzQgAQ7czBGkDX X-Google-Smtp-Source: APXvYqzB03A6/uFaA+aMcEDhb10J8uMiGMBsvBNzI5WiGYoN2Ne+iRnEIZCqpv9xpoRMpISrjbP0GK+lGYzcfeokleBUwej3rEbn MIME-Version: 1.0 X-Received: by 2002:a02:bb05:: with SMTP id y5mr33900034jan.93.1562766485874; Wed, 10 Jul 2019 06:48:05 -0700 (PDT) Date: Wed, 10 Jul 2019 06:48:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000041eeb7058d53ed4c@google.com> Subject: KMSAN: uninit-value in friio_power_ctrl From: syzbot To: crope@iki.fi, glider@google.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 4009f3cf kmsan: slub: fix a compilation warning by moving .. git tree: kmsan console output: https://syzkaller.appspot.com/x/log.txt?x=10b58730600000 kernel config: https://syzkaller.appspot.com/x/.config?x=40511ad0c5945201 dashboard link: https://syzkaller.appspot.com/bug?extid=9e6bf7282557bd1fc80d compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9e6bf7282557bd1fc80d@syzkaller.appspotmail.com usb 6-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36 usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 6-1: config 0 descriptor?? usb 6-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state ================================================================== BUG: KMSAN: uninit-value in friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:433 [inline] BUG: KMSAN: uninit-value in friio_power_ctrl+0xb3e/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.2.0-rc4+ #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:433 [inline] friio_power_ctrl+0xb3e/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482 dvb_usbv2_device_power_ctrl drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:540 [inline] dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:853 [inline] dvb_usbv2_probe+0xd3d/0x5dd0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0x1344/0x1d90 drivers/base/dd.c:513 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x489/0x750 drivers/base/dd.c:843 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890 bus_probe_device+0x131/0x390 drivers/base/bus.c:514 device_add+0x25b5/0x2df0 drivers/base/core.c:2111 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266 really_probe+0x1344/0x1d90 drivers/base/dd.c:513 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x489/0x750 drivers/base/dd.c:843 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890 bus_probe_device+0x131/0x390 drivers/base/bus.c:514 device_add+0x25b5/0x2df0 drivers/base/core.c:2111 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x5853/0x7320 drivers/usb/core/hub.c:5432 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----rbuf.i@friio_power_ctrl Variable was created at: friio_reset drivers/media/usb/dvb-usb-v2/gl861.c:400 [inline] friio_power_ctrl+0x92/0x1a70 drivers/media/usb/dvb-usb-v2/gl861.c:482 dvb_usbv2_device_power_ctrl drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:540 [inline] dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:853 [inline] dvb_usbv2_probe+0xd3d/0x5dd0 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980 ================================================================== --- This bug is generated by a bot. 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