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=-9.6 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,USER_AGENT_SANE_1 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 DD03CC07E95 for ; Tue, 13 Jul 2021 08:37:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C39DC611CB for ; Tue, 13 Jul 2021 08:37:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234622AbhGMIkW (ORCPT ); Tue, 13 Jul 2021 04:40:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234396AbhGMIkW (ORCPT ); Tue, 13 Jul 2021 04:40:22 -0400 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE2D4C0613DD; Tue, 13 Jul 2021 01:37:32 -0700 (PDT) Received: by mail-wm1-x32a.google.com with SMTP id j34so13056563wms.5; Tue, 13 Jul 2021 01:37:32 -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=7BWSTbSfHlzUqKFrbnJ8tk31HL063x9YnmUKfK19P0I=; b=klVSxQJYTRxK4bT8R1GhFzFx4WfZkCKimGF1EiJnxUUJ1/mzA3IFrGYFXDbYR80x5s dXMPAwSiBkK4Vr+LJzymiwFpWYkseUm28thEtLG30gzKBIjYkwf5EFIDDepCdL3KRqVS OyGhZLFVE634Jz/7eajCd1EY++NoglIrFuNR5e44gdqVN0Mm6tt+YbuBI/RDEUmJoXT3 He9vrNgUG821bR/B5lnbxyUNkH0OhdOZVdXCDLp+gVPBQZYAdVPy8udglMT4A6bnIFJH 41XkgbiMDyY3HwSKKG6+0Z4R6qGAtIWPG4SohIQQCVVN54gSNRmxqqdPl3K17aFZB0Ox mh9Q== 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=7BWSTbSfHlzUqKFrbnJ8tk31HL063x9YnmUKfK19P0I=; b=KnmHC660hREjEenyjV9pZlAXJTP9E2eq2RvNncwMoxNzyfACOe/+4jrFXw8pAIEusQ 1Nham0yumL5veREoFH+p9IjR5lhwcOpZMmYfEsp7INH4E6iRQ/M1Arj3N360+T3ipmN3 N7TVOXFnJcty/1ZnCUkNDgpW4cBHht9gyJtFSb1z36fWbXVK4QbsEYa/mi5nOzg9C6ti qQjnDK4RCvPJkQOTZKYYNCrpuxvPadq4X7EjkYcmDCAcHQoSYG+s7D3gmLg47e05HZn2 OGQ8Noo0C4XDW1qGOkBEExkiDA0f+QTYz9cDjUuFH+PBdiRCIFS7x0k99C0VSFiJP28t f+EQ== X-Gm-Message-State: AOAM5305vpN9f8XUD/Nt5jLP68G0NvtZRWVxKZzdtqoa8TpGbrUQuMrJ +ftdgP+pdsPC0EY6ucFEaUs= X-Google-Smtp-Source: ABdhPJyLbX8PtDYcqNHsDNPULXKR8edSGnSVZRDAJBtfdzOGWbqRNuTcq3Kzu1Xub0qgi86npLWvBw== X-Received: by 2002:a1c:f613:: with SMTP id w19mr3635886wmc.141.1626165451362; Tue, 13 Jul 2021 01:37:31 -0700 (PDT) Received: from [192.168.8.197] ([185.69.144.178]) by smtp.gmail.com with ESMTPSA id l18sm1718260wme.29.2021.07.13.01.37.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Jul 2021 01:37:30 -0700 (PDT) Subject: Re: [syzbot] kernel BUG in io_queue_async_work To: syzbot , axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000e6deea05c6f706af@google.com> From: Pavel Begunkov Message-ID: Date: Tue, 13 Jul 2021 09:37:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <000000000000e6deea05c6f706af@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 7/13/21 2:19 AM, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 7fef2edf sd: don't mess with SD_MINORS for CONFIG_DEBUG_BL.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1575c9b0300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=957eaf08bd3bb8d6 > dashboard link: https://syzkaller.appspot.com/bug?extid=d50e4f20cfad4510ec22 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=104c3949d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167cc06c300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+d50e4f20cfad4510ec22@syzkaller.appspotmail.com #syz test: https://github.com/isilence/linux.git drain_fix_syztest > > ------------[ cut here ]------------ > kernel BUG at fs/io_uring.c:1293! > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 8139 Comm: kworker/1:3 Tainted: G W 5.14.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Workqueue: events io_fallback_req_func > RIP: 0010:io_queue_async_work+0x539/0x5f0 fs/io_uring.c:1293 > Code: 89 be 89 00 00 00 48 c7 c7 40 53 9a 89 c6 05 de 38 78 0b 01 e8 72 6b 08 07 e9 6e ff ff ff e8 ee 68 95 ff 0f 0b e8 e7 68 95 ff <0f> 0b e8 e0 68 95 ff 0f 0b e9 1a fd ff ff e8 34 0f db ff e9 47 fb > RSP: 0018:ffffc9000c627ba8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff88802d256000 RCX: 0000000000000000 > RDX: ffff888030f4e180 RSI: ffffffff81df55c9 RDI: ffff88802ef66a50 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000019 > R10: ffffffff81df517c R11: 000000000000000f R12: ffff8880441eb6c0 > R13: 0000000000000019 R14: ffff88802d2560b0 R15: ffff8880441eb718 > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000000049a01d CR3: 00000000396af000 CR4: 00000000001506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __io_queue_sqe+0x913/0xf10 fs/io_uring.c:6448 > io_req_task_submit+0x100/0x120 fs/io_uring.c:2020 > io_fallback_req_func+0x81/0xb0 fs/io_uring.c:2441 > process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 > worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Modules linked in: > ---[ end trace aa15edd5dcdbd7e3 ]--- > RIP: 0010:io_queue_async_work+0x539/0x5f0 fs/io_uring.c:1293 > Code: 89 be 89 00 00 00 48 c7 c7 40 53 9a 89 c6 05 de 38 78 0b 01 e8 72 6b 08 07 e9 6e ff ff ff e8 ee 68 95 ff 0f 0b e8 e7 68 95 ff <0f> 0b e8 e0 68 95 ff 0f 0b e9 1a fd ff ff e8 34 0f db ff e9 47 fb > RSP: 0018:ffffc9000c627ba8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff88802d256000 RCX: 0000000000000000 > RDX: ffff888030f4e180 RSI: ffffffff81df55c9 RDI: ffff88802ef66a50 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000019 > R10: ffffffff81df517c R11: 000000000000000f R12: ffff8880441eb6c0 > R13: 0000000000000019 R14: ffff88802d2560b0 R15: ffff8880441eb718 > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000444 CR3: 0000000042660000 CR4: 00000000001506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > -- Pavel Begunkov