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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 59BE1C433DF for ; Tue, 21 Jul 2020 11:20:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 39D46208E4 for ; Tue, 21 Jul 2020 11:20:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729589AbgGULUH (ORCPT ); Tue, 21 Jul 2020 07:20:07 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:33022 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729514AbgGULUG (ORCPT ); Tue, 21 Jul 2020 07:20:06 -0400 Received: by mail-io1-f70.google.com with SMTP id a12so13239160ioo.0 for ; Tue, 21 Jul 2020 04:20:05 -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=PakZhdVRy00H5Jh4vTqRjEQYSnP47NKLSdT3K911Emg=; b=JunPTgArJg5y7xfRc9c+tuGC0uephK3VS3TM3s7yC0VrJPpBofWv7GlkWwbfaQDPjF cf+m0rRLH6jWqSSUFaxWlP0h/UIvmJGkbAa85dHk1mlrHJEEHvVr95I1D6trdZQciHH3 9tA6f2okHLBv9cJ5Qa1QcUIxQuE/1fvaH2c73YFTY91WI8KMenUskYibfvhZx8umwwcF lCMMP3r0rtXtU5dESIMYr86VllLC//ds0CGb8V2pqOa2LPtaemZU0IVAVDjCGq20nUYL T9z0TfFX7yv3lIh1UYuxk9h6o0TbK0kXebYi0kudjRS95K+Qok9MHgPmzvHhX7kKqixZ zF5Q== X-Gm-Message-State: AOAM532r8ApF8Mk0L3wAoNHpYZX1UUJBc/EisR4s+O9PIHyDVyLeIpXV 2fzzrwQH77pna0uQF1hI4D3Q1wS2vkaZ2qQ2BMwwcZzyAACy X-Google-Smtp-Source: ABdhPJx3ptVWWJ4i6pIxXv/78PQF6oVLHXTz3Oh2F4h7h1aMKeQbb1QOTpZj/9jJfd/8b15zRVAz47qSc4jOmZlwHMb2VT1uRibs MIME-Version: 1.0 X-Received: by 2002:a92:2802:: with SMTP id l2mr27644334ilf.169.1595330405476; Tue, 21 Jul 2020 04:20:05 -0700 (PDT) Date: Tue, 21 Jul 2020 04:20:05 -0700 In-Reply-To: <20200721111007.hwwdveqxeqcry4wn@pesu.pes.edu> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001e30e105aaf1ce89@google.com> Subject: Re: WARNING in pvr2_i2c_core_done From: syzbot To: bkkarthik@pesu.pes.edu, dan.carpenter@oracle.com, gregkh@linuxfoundation.org, isely@pobox.com, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, skhan@linuxfoundation.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in kernfs_find_ns pvrusb2: Invalid write control endpoint pvrusb2: Invalid write control endpoint pvrusb2: Invalid write control endpoint pvrusb2: Invalid write control endpoint pvrusb2: Invalid write control endpoint pvrusb2: Invalid write control endpoint general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 0 PID: 78 Comm: pvrusb2-context Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kernfs_find_ns+0x31/0x370 fs/kernfs/dir.c:829 Code: 49 89 d6 41 55 41 54 55 48 89 fd 53 48 83 ec 08 e8 f4 61 af ff 48 8d 7d 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1e 03 00 00 48 8d bd 98 00 00 00 48 8b 5d 70 48 RSP: 0018:ffff8881d4187938 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff863789c0 RCX: ffffffff85a79ba7 RDX: 000000000000000e RSI: ffffffff81901d1c RDI: 0000000000000070 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff873ed1e7 R10: fffffbfff0e7da3c R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff863790e0 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557f2b45ae48 CR3: 00000001d2762000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernfs_find_and_get_ns+0x2f/0x60 fs/kernfs/dir.c:906 kernfs_find_and_get include/linux/kernfs.h:548 [inline] sysfs_unmerge_group+0x5d/0x160 fs/sysfs/group.c:366 dpm_sysfs_remove+0x62/0xb0 drivers/base/power/sysfs.c:790 device_del+0x18b/0xd20 drivers/base/core.c:2834 device_unregister+0x22/0xc0 drivers/base/core.c:2889 i2c_unregister_device include/linux/err.h:41 [inline] i2c_client_dev_release+0x39/0x50 drivers/i2c/i2c-core-base.c:465 device_release+0x71/0x200 drivers/base/core.c:1559 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x245/0x540 lib/kobject.c:739 put_device drivers/base/core.c:2779 [inline] device_unregister+0x34/0xc0 drivers/base/core.c:2890 i2c_unregister_device+0x38/0x40 include/linux/err.h:41 v4l2_i2c_new_subdev_board+0x159/0x2c0 drivers/media/v4l2-core/v4l2-i2c.c:114 v4l2_i2c_new_subdev+0xb8/0xf0 drivers/media/v4l2-core/v4l2-i2c.c:135 pvr2_hdw_load_subdev drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2023 [inline] pvr2_hdw_load_modules drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2075 [inline] pvr2_hdw_setup_low drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2156 [inline] pvr2_hdw_setup drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2262 [inline] pvr2_hdw_initialize+0xc8d/0x3600 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2339 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:109 [inline] pvr2_context_thread_func+0x250/0x850 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Modules linked in: ---[ end trace 9af941b6bcb04b01 ]--- RIP: 0010:kernfs_find_ns+0x31/0x370 fs/kernfs/dir.c:829 Code: 49 89 d6 41 55 41 54 55 48 89 fd 53 48 83 ec 08 e8 f4 61 af ff 48 8d 7d 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1e 03 00 00 48 8d bd 98 00 00 00 48 8b 5d 70 48 RSP: 0018:ffff8881d4187938 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff863789c0 RCX: ffffffff85a79ba7 RDX: 000000000000000e RSI: ffffffff81901d1c RDI: 0000000000000070 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff873ed1e7 R10: fffffbfff0e7da3c R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff863790e0 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557f2b45ae48 CR3: 00000001d2762000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Tested on: commit: b791d1bd Merge tag 'locking-kcsan-2020-06-11' of git://git.. git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=16dfe440900000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccf1899337a6e343 dashboard link: https://syzkaller.appspot.com/bug?extid=e74a998ca8f1df9cc332 compiler: gcc (GCC) 10.1.0-syz 20200507 patch: https://syzkaller.appspot.com/x/patch.diff?x=117e281b100000