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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_PASS,URIBL_BLOCKED autolearn=ham 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 3986EC10F0E for ; Mon, 15 Apr 2019 06:55:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0BB5120693 for ; Mon, 15 Apr 2019 06:55:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726172AbfDOGzG (ORCPT ); Mon, 15 Apr 2019 02:55:06 -0400 Received: from mail-it1-f199.google.com ([209.85.166.199]:54483 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725796AbfDOGzG (ORCPT ); Mon, 15 Apr 2019 02:55:06 -0400 Received: by mail-it1-f199.google.com with SMTP id i188so15545810iti.4 for ; Sun, 14 Apr 2019 23:55:05 -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:in-reply-to:message-id:subject :from:to; bh=ZemaBQEK2j6NfWyJ+bikcyU88hEbBD2R/oNX89YYc68=; b=IuijBvhdXj9QHxfje8LDPtcPaQawaM2wwCmKvu7QRf8BewQ2Cz/RocQvFt7k/oIfio AeUtDKxldqnqVrU5akxwz4/R3xaN2h4tWqHmXxy6XAtYKabdRIgS4DTZ0UA9tWbzPECz 7LrHEIY6kN/3VjlCV07c4gzWaQmbExi5rCaQAn2WLdpD4pM9ww/B5whwJIQnSHUnJcuN ISyo2/mjJKD/0nAYD62Cw6T922kx3J64Chi2Qtn6pECBLT2XgYMDfFYPWbZx06U+tvDs YxVZkao01jrDQ6Tnk5ABTF3qO0nlYA9x+Pm9aX0iuzW+i88THZiNz681itx7TmmZJVU0 1vIA== X-Gm-Message-State: APjAAAWhRFTDuvRXsjX9KP08aU+WhNx+x7GSCVL5ppZr36piuSdjFULc ysxXCnrm2D57UB9NPJwW1NeYGw04mS5mFPI+ZND4JhEEmRDS X-Google-Smtp-Source: APXvYqxxc3P7WiRN6Gw3NuJf9fjKIgqME5N9ryQO8gQ3sNMCmNB693eydNjSwlcXyk6SCQXbtXHGyr9sVssLcDffToMpyqpgjWIy MIME-Version: 1.0 X-Received: by 2002:a5d:8c8f:: with SMTP id g15mr721488ion.36.1555311305158; Sun, 14 Apr 2019 23:55:05 -0700 (PDT) Date: Sun, 14 Apr 2019 23:55:05 -0700 In-Reply-To: <0000000000008706a1058653d950@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000dbf5a105868c21c7@google.com> Subject: Re: WARNING: proc registration bug in snd_info_register From: syzbot To: alsa-devel-owner@alsa-project.org, alsa-devel@alsa-project.org, andreyknvl@google.com, joe@perches.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com, vkoul@kernel.org 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 syzbot has found a reproducer for the following crash on: HEAD commit: 9a33b369 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan/tree/usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=147d659f200000 kernel config: https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15 dashboard link: https://syzkaller.appspot.com/bug?extid=4d729bd9da724d0282dd compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144ab07b200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1559d1e3200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4d729bd9da724d0282dd@syzkaller.appspotmail.com snd_usb_toneport 1-1:0.0: Line 6 POD Studio UX2 now attached usb 1-1: USB disconnect, device number 11 snd_usb_toneport 5-1:0.0: read request failed (error -110) ------------[ cut here ]------------ proc_dir_entry 'asound/card4' already registered WARNING: CPU: 0 PID: 5572 at fs/proc/generic.c:359 proc_register+0x3d9/0x550 fs/proc/generic.c:359 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 5572 Comm: kworker/0:2 Not tainted 5.1.0-rc4-319354-g9a33b36 #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event usb 2-1: Using ep0 maxpacket: 8 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 panic+0x29d/0x5f2 kernel/panic.c:214 usb 3-1: Using ep0 maxpacket: 8 __warn.cold+0x20/0x48 kernel/panic.c:571 report_bug+0x262/0x2a0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x130/0x1f0 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291 snd_usb_toneport 5-1:0.0: read request failed (error -110) invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:proc_register+0x3d9/0x550 fs/proc/generic.c:359 Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 61 01 00 00 48 8b 04 24 48 c7 c7 e0 a0 79 8e 48 8b b0 d0 00 00 00 e8 a7 9e 71 ff <0f> 0b 48 c7 c7 a0 90 91 91 e8 b9 10 34 0c 48 8b 4c 24 28 48 b8 00 RSP: 0018:ffff88809176f040 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff88809cf2f700 RCX: 0000000000000000 usb 2-1: config 0 interface 0 has no altsetting 0 RDX: 0000000000000000 RSI: ffffffff815b1e42 RDI: ffffed10122eddfa RBP: ffff8880a00f3140 R08: ffff88809738e200 R09: ffffed1015a03edb R10: ffffed1015a03eda R11: ffff8880ad01f6d7 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880933340b8 R15: 0000000000000005 proc_mkdir_data+0x17b/0x230 fs/proc/generic.c:475 usb 2-1: New USB device found, idVendor=0e41, idProduct=4151, bcdDevice=7a.8f __snd_info_register sound/core/info.c:814 [inline] snd_info_register+0x2f8/0x3e0 sound/core/info.c:854 create_subdir+0x69/0xa0 sound/core/info.c:458 snd_info_card_create+0xcf/0x230 sound/core/info.c:528 snd_card_new+0x61d/0x920 sound/core/init.c:255 line6_probe+0x135/0x1150 sound/usb/line6/driver.c:736 usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361 usb 2-1: config 0 descriptor?? really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb 3-1: config 0 interface 0 has no altsetting 0 usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021 generic_probe+0xa2/0xda drivers/usb/core/generic.c:210 usb 3-1: New USB device found, idVendor=0e41, idProduct=4151, bcdDevice=7a.8f usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266 really_probe+0x2da/0xb10 drivers/base/dd.c:509 driver_probe_device+0x21d/0x350 drivers/base/dd.c:671 __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778 bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454 usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 snd_usb_toneport 5-1:0.0: write request failed (error -110) __device_attach+0x223/0x3a0 drivers/base/dd.c:844 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514 usb 3-1: config 0 descriptor?? device_add+0xad2/0x16e0 drivers/base/core.c:2106 usb 5-1: send failed (error -110) usb_new_device.cold+0x537/0xccf 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+0x138e/0x3b00 drivers/usb/core/hub.c:5432 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 usb 5-1: send failed (error -110) process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..