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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E841EC77B76 for ; Mon, 24 Apr 2023 07:21:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231139AbjDXHVM (ORCPT ); Mon, 24 Apr 2023 03:21:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230287AbjDXHVG (ORCPT ); Mon, 24 Apr 2023 03:21:06 -0400 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C22335A8 for ; Mon, 24 Apr 2023 00:20:47 -0700 (PDT) Received: by mail-io1-f77.google.com with SMTP id ca18e2360f4ac-763761822f0so672140739f.0 for ; Mon, 24 Apr 2023 00:20:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682320846; x=1684912846; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=6V1v686ve3c+aTnGM5hVFhRx0tPmTYhhhSQ+kuXWS1w=; b=eg6OPJ5zmzxY9aeXkf6lK6o+dQXXQGozcWxWrdEoHJU2sDEBmstUBqvPeTFLO688B1 N79yte4vkqC+wM59fwYgdUekdBo3nCGZZGkgMHfY6D8rArNhMtbn6GFhTj+qkpcuvGvC Yhd2EQt4NhTnf3SIi2+bNNPsECF6SoB5MuRYSoTFkzoA+6MNQAm/CQ2VgC044bFMSlzW BZUjn9mi3oJruZ62ZgdfmkTr/DfgPuv0ih46umIinBNgse31r/hEs/66f9n0Fvwn/daP EV/EbcMUU3WljijS3hpmBzqgOTH1IMTMnIQfQ5QO89FwYB1Q5oRidxAFzTK2+RAqaN3n G+ig== X-Gm-Message-State: AAQBX9cORvwgcNYSJFssWr8ozVQ4OC4eApd7ZDwjW9rDRv7qS3+6Ryyj 51D2o01Yv8sv/L5BSYMhiIxkGnJOtPlkDj29O2C4lnATZfZL X-Google-Smtp-Source: AKy350a491gbdltOa21Cgcv5E5GSOv+mLzApaDWbiCOH8WliSTN9CiifzuxLkguayPy6yKmMD0KPoxjoIfPZlTTC+ZiTBhPvPKFz MIME-Version: 1.0 X-Received: by 2002:a6b:cf09:0:b0:763:6865:50eb with SMTP id o9-20020a6bcf09000000b00763686550ebmr4092783ioa.4.1682320846155; Mon, 24 Apr 2023 00:20:46 -0700 (PDT) Date: Mon, 24 Apr 2023 00:20:46 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006efbbe05fa0fd886@google.com> Subject: [syzbot] [nfc?] KCSAN: data-race in __list_del_entry_valid / nfc_llcp_register_device From: syzbot To: davem@davemloft.net, edumazet@google.com, krzysztof.kozlowski@linaro.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-nfc@lists.01.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 44149752e998 Merge tag 'cgroup-for-6.3-rc6-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1682221fc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=710057cbb8def08c dashboard link: https://syzkaller.appspot.com/bug?extid=742c192afb1b2a0cbe86 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7bfa303f05cc/disk-44149752.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4e8ea8730409/vmlinux-44149752.xz kernel image: https://storage.googleapis.com/syzbot-assets/e584bce13ba7/bzImage-44149752.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+742c192afb1b2a0cbe86@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __list_del_entry_valid / nfc_llcp_register_device read to 0xffff88810318c808 of 8 bytes by task 28453 on cpu 1: __list_del_entry_valid+0x15/0xe0 lib/list_debug.c:46 __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] local_release net/nfc/llcp_core.c:172 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:182 [inline] nfc_llcp_unregister_device+0x7e/0x130 net/nfc/llcp_core.c:1620 nfc_unregister_device+0xe6/0x130 net/nfc/core.c:1179 nci_unregister_device+0x14c/0x160 net/nfc/nci/core.c:1303 virtual_ncidev_close+0x30/0x50 drivers/nfc/virtual_ncidev.c:163 __fput+0x245/0x570 fs/file_table.c:321 ____fput+0x15/0x20 fs/file_table.c:349 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd1/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd write to 0xffff88810318c808 of 8 bytes by task 28459 on cpu 0: __list_add include/linux/list.h:72 [inline] list_add include/linux/list.h:88 [inline] nfc_llcp_register_device+0x3e4/0x440 net/nfc/llcp_core.c:1604 nfc_register_device+0x67/0x190 net/nfc/core.c:1124 nci_register_device+0x4e6/0x570 net/nfc/nci/core.c:1257 virtual_ncidev_open+0xdc/0x140 drivers/nfc/virtual_ncidev.c:148 misc_open+0x1fd/0x230 drivers/char/misc.c:165 chrdev_open+0x349/0x3c0 fs/char_dev.c:414 do_dentry_open+0x5b3/0x930 fs/open.c:920 vfs_open+0x47/0x50 fs/open.c:1051 do_open fs/namei.c:3560 [inline] path_openat+0x17e6/0x1d00 fs/namei.c:3715 do_filp_open+0xf6/0x200 fs/namei.c:3742 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0xf3/0x120 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffffffff85eac670 -> 0xdead000000000122 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 28459 Comm: syz-executor.0 Not tainted 6.3.0-rc6-syzkaller-00138-g44149752e998 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.