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=-9.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 73333C433B4 for ; Fri, 7 May 2021 19:49:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 439A861426 for ; Fri, 7 May 2021 19:49:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229946AbhEGTuP (ORCPT ); Fri, 7 May 2021 15:50:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229791AbhEGTuN (ORCPT ); Fri, 7 May 2021 15:50:13 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3E03C061574; Fri, 7 May 2021 12:49:12 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id t18so10388942wry.1; Fri, 07 May 2021 12:49:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=ssdAUcnXtt401L+SImO691JRXwB9qES+510O8xa3Y9Y=; b=f8JvGKdnVyJkd5fBITq63yBSZ0ElthuoEkmgki1uJK8K6iRRo0zPyvDTq2dVg1Fuoo MTxb9xY3BR/S7RvJ3A9bqCWFK/ZwldQ9Vl/kRgngvECdP7TLcomEJlj056Z3GYnLeG3Q 6Yq0flPKUZgWCemMH4rWV0EUID7ks7Xi8M8r7Cix4oZlF30759k1MFMa+9Q8PTZpfHLZ GI45lpKlZlct6neOQltNmIHSfIpC3wyRaXJ6WPIAcgKaI/CMpAp3CYFlNlu8Kh64ZV8z 2xt/gDcFzkIbQfRxVBznVU4QV3Bl8+DYl+G6U8sehS0F+ZZf7R0k4EzBI+2CJ63/SmGR gZBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=ssdAUcnXtt401L+SImO691JRXwB9qES+510O8xa3Y9Y=; b=mr58lxIYwlKJk7kKBe+DTZ8e0YQp6C05oleWRVqCO0Q+AHT49deNwC8WDd7nBWhpH/ nHFPmG3D7YsvwKhbLuBDPCqDStzT4fAq/vRUkyGYPdR0y/ZoEsJI9kU+DMKrdqxDkb2c T/Venblrw+7dCAl5Du+bvlL1+3jk0dsYOHq1KsRWO+ZZsoMjSZ4MsUbpxdWPyxiSz8Zh v3VvzWQ7OcoHlwXtxqeRXSeQyGT99lmTWAaUtYcwvYBDSArVAjZZB/X1R0BTBt1Bl5HR QoUgTpboyILE6A1dXAX620ggHrQtCoOT+SuxtT8Cs2gajh5/L0Hq92+a8vTNutc4uvXe JWRQ== X-Gm-Message-State: AOAM530tYXJc9CPw15T1D16BW4lT+/ez85SA6lwuFvqX3ySRtA+l8LDd znu52wrNuWUj4j9h/iVb+kc= X-Google-Smtp-Source: ABdhPJxBkZCHac2ZWbOeGIri8hXu7pz2CpEh9Ll6KHlV+sOSFb4Xdxi7qTojiJmqfORgeJxQHU6mnQ== X-Received: by 2002:a5d:6885:: with SMTP id h5mr14410667wru.229.1620416951597; Fri, 07 May 2021 12:49:11 -0700 (PDT) Received: from [192.168.8.197] ([148.252.132.80]) by smtp.gmail.com with ESMTPSA id e8sm9369279wrt.30.2021.05.07.12.49.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 07 May 2021 12:49:11 -0700 (PDT) Subject: Re: [syzbot] INFO: task hung in __io_uring_cancel To: syzbot , axboe@kernel.dk, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <000000000000aca64205c05dcab3@google.com> From: Pavel Begunkov Message-ID: Date: Fri, 7 May 2021 20:49:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <000000000000aca64205c05dcab3@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/20/21 2:59 AM, syzbot wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > KASAN: null-ptr-deref Write in io_uring_cancel_sqpoll #syz test: git://git.kernel.dk/linux-block io_uring-5.13 > > ================================================================== > BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > BUG: KASAN: null-ptr-deref in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] > BUG: KASAN: null-ptr-deref in io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930 > Write of size 4 at addr 0000000000000114 by task iou-sqp-31588/31596 > > CPU: 0 PID: 31596 Comm: iou-sqp-31588 Not tainted 5.12.0-rc7-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x141/0x1d7 lib/dump_stack.c:120 > __kasan_report mm/kasan/report.c:403 [inline] > kasan_report.cold+0x5f/0xd8 mm/kasan/report.c:416 > check_region_inline mm/kasan/generic.c:180 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 > instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] > io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930 > io_sq_thread+0x47e/0x1310 fs/io_uring.c:6873 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > ================================================================== > Kernel panic - not syncing: panic_on_warn set ... > CPU: 1 PID: 31596 Comm: iou-sqp-31588 Tainted: G B 5.12.0-rc7-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x141/0x1d7 lib/dump_stack.c:120 > panic+0x306/0x73d kernel/panic.c:231 > end_report mm/kasan/report.c:102 [inline] > end_report.cold+0x5a/0x5a mm/kasan/report.c:88 > __kasan_report mm/kasan/report.c:406 [inline] > kasan_report.cold+0x6a/0xd8 mm/kasan/report.c:416 > check_region_inline mm/kasan/generic.c:180 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 > instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] > io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930 > io_sq_thread+0x47e/0x1310 fs/io_uring.c:6873 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > Tested on: > > commit: 734551df io_uring: fix shared sqpoll cancellation hangs > git tree: git://git.kernel.dk/linux-block for-5.13/io_uring > console output: https://syzkaller.appspot.com/x/log.txt?x=175fec6dd00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=601d16d8cd22e315 > dashboard link: https://syzkaller.appspot.com/bug?extid=47fc00967b06a3019bd2 > compiler: > -- Pavel Begunkov