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=-1.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 1A79FC43381 for ; Wed, 27 Feb 2019 13:13:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCC0D2133D for ; Wed, 27 Feb 2019 13:13:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="gnWYGq6g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726122AbfB0NNa (ORCPT ); Wed, 27 Feb 2019 08:13:30 -0500 Received: from mail-pl1-f196.google.com ([209.85.214.196]:35196 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729248AbfB0NNX (ORCPT ); Wed, 27 Feb 2019 08:13:23 -0500 Received: by mail-pl1-f196.google.com with SMTP id p19so8021383plo.2 for ; Wed, 27 Feb 2019 05:13:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=CaQsr6S9Iz106Nqji5Are9jsxwbVtuMbgR/Sm3jS8CA=; b=gnWYGq6gf72+e1wdzzrxFgUoV7PWAjcC3EhOqXsMutnS8jl5kFBQlRFBLaZsyiRMcb xf1+6r1XO4rAY5+COebkuNaPJjXBQWHENeY6C20jdJs6K693NzG9tCp7gCUd6oPnbcTZ /cm4HdhpEUI/Wmb5XeHqCyLXxf75X65cr8hxGOuTZVMBttghY/84HPgGgBeN131WsMSl QO2rFAOPb+KxYgzgvXb2V1VRL9VoZKD7I04XoCR90oQahwrNsBX9/2Ydv1qDrcVoSJuL 7eNilTqoXFGd33pyqTMEUwRp29t/aisfEdjZafYcUTxi8WrT5Q61+1LkezOfaNhBJbYk jNig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=CaQsr6S9Iz106Nqji5Are9jsxwbVtuMbgR/Sm3jS8CA=; b=e8vvhHG1K2VbeJdMYaXUL+8Vklu3ZMMml5CmFbJl1I3De5DsSoQlatPj/NZk/fdCbG V0sR1jT8RHdgcHp81tMgidwnH3XmrCSJAILL65pewbpMklFF4vGhstIjEss7bPnjytfS ZSLqnE5yswQ8HdVMu4w4scxQyLgAT2MNzDXtD+9dUkGb6OCB0/fkHpgPe6oufGbJfev7 d2hbRSTirpju2nAZRrZxkweAebcfggDL5ZfIxdWLo2BRI89Jky3ol7lkniIOx7LSgXQB dJMuGcyEmjPM7yG2hkMBws8hoRGu25QoU9iQhvSZjR+RJ60S8TJ2/YCM3pQG1QcvLQbF DSpg== X-Gm-Message-State: AHQUAuaEp0hU7CmblUu4d+AGIKB6nYcbQ5hc3ZLlPm+zBsBTm1IQNJj5 vuwh1BfqNw1X0v1YkUT+xQGP6w== X-Google-Smtp-Source: AHgI3IZ3f/a0X/hWi2LuYbqyvzAXfhiXmxaatdLeG6Q1ozO+6GW3igKxX6HtO5xkKSgbHEkTn8EsUQ== X-Received: by 2002:a17:902:7688:: with SMTP id m8mr2064297pll.248.1551273202619; Wed, 27 Feb 2019 05:13:22 -0800 (PST) Received: from [192.168.1.121] (66.29.188.166.static.utbb.net. [66.29.188.166]) by smtp.gmail.com with ESMTPSA id d23sm21909650pfn.180.2019.02.27.05.13.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Feb 2019 05:13:21 -0800 (PST) Subject: Re: kernel BUG at include/linux/mm.h:LINE! (3) To: Eric Biggers , syzbot Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <000000000000b8bcea0582d9e992@google.com> <20190227061143.GA680@sol.localdomain> From: Jens Axboe Message-ID: <10ff57b7-5f61-a447-e9af-e883b418f12d@kernel.dk> Date: Wed, 27 Feb 2019 06:13:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190227061143.GA680@sol.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 2/26/19 11:11 PM, Eric Biggers wrote: > On Tue, Feb 26, 2019 at 10:02:04PM -0800, syzbot wrote: >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: 8e7f81e2ebc4 Add linux-next specific files for 20190226 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=10381714c00000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=2fa10211b8a4a56e >> dashboard link: https://syzkaller.appspot.com/bug?extid=a5b71df98b247d973f8c >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14eda192c00000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164831e0c00000 >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+a5b71df98b247d973f8c@syzkaller.appspotmail.com >> >> page:ffffea00025c3ac0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 >> flags: 0x1fffc0000000000() >> raw: 01fffc0000000000 ffffea00024bf988 ffffea00021dd448 0000000000000000 >> raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 >> page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) >> ------------[ cut here ]------------ >> kernel BUG at include/linux/mm.h:579! >> invalid opcode: 0000 [#1] PREEMPT SMP KASAN >> CPU: 0 PID: 7779 Comm: syz-executor379 Not tainted 5.0.0-rc8-next-20190226 >> #43 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> RIP: 0010:put_page_testzero include/linux/mm.h:579 [inline] >> RIP: 0010:put_page include/linux/mm.h:1025 [inline] >> RIP: 0010:generic_pipe_buf_release+0x120/0x160 fs/pipe.c:224 >> Code: bd ff 4c 89 e7 e8 90 43 db ff e8 bb 29 bd ff 5b 41 5c 41 5d 5d c3 e8 >> af 29 bd ff 48 c7 c6 20 98 75 87 4c 89 e7 e8 c0 db e4 ff <0f> 0b e8 99 29 bd >> ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 e8 f8 >> RSP: 0018:ffff8880a503f920 EFLAGS: 00010293 >> RAX: ffff88808d2ec6c0 RBX: ffffea00025c3af4 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: ffffffff81982852 RDI: ffffea00025c3af8 >> RBP: ffff8880a503f938 R08: 000000000000003e R09: ffffed1015d05011 >> R10: ffffed1015d05010 R11: ffff8880ae828087 R12: ffffea00025c3ac0 >> R13: 0000000000000000 R14: ffff88809b6e8a40 R15: ffff8880952c4000 >> FS: 00000000016a0880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000000020f50f90 CR3: 0000000097b89000 CR4: 00000000001406f0 >> Call Trace: >> pipe_buf_release include/linux/pipe_fs_i.h:129 [inline] >> iter_file_splice_write+0x7d1/0xbe0 fs/splice.c:759 >> do_splice_from fs/splice.c:847 [inline] >> direct_splice_actor+0x126/0x1a0 fs/splice.c:1019 >> splice_direct_to_actor+0x369/0x970 fs/splice.c:974 >> do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 >> do_sendfile+0x597/0xd00 fs/read_write.c:1442 >> __do_sys_sendfile64 fs/read_write.c:1503 [inline] >> __se_sys_sendfile64 fs/read_write.c:1489 [inline] >> __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1489 >> do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 >> entry_SYSCALL_64_after_hwframe+0x49/0xbe >> RIP: 0033:0x443d29 >> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 >> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff >> 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 >> RSP: 002b:00007fffc1e47c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 >> RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d29 >> RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 >> RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 >> R10: 0000000102000300 R11: 0000000000000246 R12: 0000000000401a30 >> R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 >> Modules linked in: >> ---[ end trace 9daff95e0e1a45ff ]--- >> RIP: 0010:put_page_testzero include/linux/mm.h:579 [inline] >> RIP: 0010:put_page include/linux/mm.h:1025 [inline] >> RIP: 0010:generic_pipe_buf_release+0x120/0x160 fs/pipe.c:224 >> Code: bd ff 4c 89 e7 e8 90 43 db ff e8 bb 29 bd ff 5b 41 5c 41 5d 5d c3 e8 >> af 29 bd ff 48 c7 c6 20 98 75 87 4c 89 e7 e8 c0 db e4 ff <0f> 0b e8 99 29 bd >> ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 e8 f8 >> RSP: 0018:ffff8880a503f920 EFLAGS: 00010293 >> RAX: ffff88808d2ec6c0 RBX: ffffea00025c3af4 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: ffffffff81982852 RDI: ffffea00025c3af8 >> RBP: ffff8880a503f938 R08: 000000000000003e R09: ffffed1015d05011 >> R10: ffffed1015d05010 R11: ffff8880ae828087 R12: ffffea00025c3ac0 >> R13: 0000000000000000 R14: ffff88809b6e8a40 R15: ffff8880952c4000 >> FS: 00000000016a0880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000000020f50f90 CR3: 0000000097b89000 CR4: 00000000001406f0 >> >> >> --- >> This bug 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 bug report. See: >> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with >> syzbot. >> syzbot can test patches for this bug, for details see: >> https://goo.gl/tpsmEJ#testing-patches >> > > This is the same bug I already reported here and Jens is working on: > https://marc.info/?l=linux-api&m=155115288114046&w=2 > I'll mark this fixed once the fix is folded in and in linux-next. It should already be, I folded in the fix about 24h ago. -- Jens Axboe