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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 3619AC43387 for ; Fri, 21 Dec 2018 11:11:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C0D720866 for ; Fri, 21 Dec 2018 11:11:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389167AbeLULLF (ORCPT ); Fri, 21 Dec 2018 06:11:05 -0500 Received: from mail-io1-f69.google.com ([209.85.166.69]:35300 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726604AbeLULLE (ORCPT ); Fri, 21 Dec 2018 06:11:04 -0500 Received: by mail-io1-f69.google.com with SMTP id i11so296531iog.2 for ; Fri, 21 Dec 2018 03:11:04 -0800 (PST) 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:message-id:subject:from:to; bh=UBVrCdieYg9UK0EPEY0nGUoPuxOHIQH4409NbwCEasI=; b=Pog+ferZltMHhCUfhL9Fk7lJnbSQcxbVosfveyCfZkK30Ts3RNLizTVYKCb56zi0EB ig32hwKN7GvBFU1sdmMFfxONn6ZMJS9w2homH0UuM0KmMTkduoWmSE7Dss5PMhlUcrwV KQu3kfXoI5UDx/edR3EzD+1CPhmHEuJyjDbpu3hVvdagLqvYzooKuz0q0kQvdGc1LTYw r8+O6FNAVk3ISWm/f6Kryirs5LUoGC40/cOYjy3rqThsvHp/BidVcYEhQ5aHRvDaRPBf ru0fqbpdNHdLMKYax3+haJPJmlkZH3WT+uO800xZUo/lhd0JB4s9wqjGMthEhuLmzVNi 71dg== X-Gm-Message-State: AA+aEWagcUo+aBNICVuPbU3GBvCJz5eSTRfXXYGPnSpXMWKGbprHE8rO QwqYrhcOGpF7ilgunVEJ1orkuDqKFuKm/RRjYls//iwEgAvV X-Google-Smtp-Source: AFSGD/UUGDflqs4Aka6fSMF5nfeoOkp1KEiEBoXBwfx1gM/LEfzV4NRvXfS1qv1Yrm+gJmXjDlD9TfPSl7keyXfVox3Lju74Bk1Y MIME-Version: 1.0 X-Received: by 2002:a24:4ac4:: with SMTP id k187mr1672823itb.8.1545390663620; Fri, 21 Dec 2018 03:11:03 -0800 (PST) Date: Fri, 21 Dec 2018 03:11:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008b5eb5057d864dab@google.com> Subject: linux-next test error: WARNING in __bio_associate_blkg From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 340ae71f9dd4 Add linux-next specific files for 20181221 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11d95667400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c190b602a5d2d731 dashboard link: https://syzkaller.appspot.com/bug?extid=a36a3ba92bea3b315c64 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a36a3ba92bea3b315c64@syzkaller.appspotmail.com sshd (6102) used greatest stack depth: 15720 bytes left IPVS: ftp: loaded support on port[0] = 21 WARNING: CPU: 1 PID: 1520 at include/linux/blk-cgroup.h:518 blkg_tryget_closest include/linux/blk-cgroup.h:518 [inline] WARNING: CPU: 1 PID: 1520 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 block/bio.c:2010 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 1520 Comm: kworker/u4:3 Not tainted 4.20.0-rc7-next-20181221 #182 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 panic+0x2ad/0x632 kernel/panic.c:214 __warn.cold.8+0x20/0x4f kernel/panic.c:571 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:176 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:269 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:288 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:blkg_tryget_closest include/linux/blk-cgroup.h:518 [inline] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 block/bio.c:2010 Code: 7b 50 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 f1 00 00 00 48 8b 43 50 4c 89 ef e8 bf c6 88 04 e9 a4 f9 ff ff e8 c5 ad 07 fe <0f> 0b e9 5c fa ff ff e8 b9 ad 07 fe e8 ab e2 88 fd e9 fe f9 ff ff RSP: 0018:ffff8881d462d738 EFLAGS: 00010293 RAX: ffff8881d461e380 RBX: 0000000000000000 RCX: ffffffff83779576 RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 RBP: ffff8881d462d8b8 R08: ffff8881d461e380 R09: ffffed103b5e5b77 R10: ffffed103b5e5b77 R11: ffff8881daf2dbbb R12: ffff8881cee19340 R13: ffff8881b3354a40 R14: ffff8881bdf4a218 R15: ffff8881cee19340 bio_clone_blkg_association block/bio.c:2101 [inline] __bio_clone_fast+0x412/0x5e0 block/bio.c:612 bio_clone_fast+0x42/0x110 block/bio.c:633 bio_split+0x86/0x260 block/bio.c:1819 blk_bio_segment_split block/blk-merge.c:231 [inline] blk_queue_split+0xa1e/0x2080 block/blk-merge.c:262 blk_mq_make_request+0x2e7/0x1e30 block/blk-mq.c:1917 generic_make_request+0x9a5/0x1890 block/blk-core.c:1087 submit_bio+0xba/0x460 block/blk-core.c:1195 ext4_io_submit+0x197/0x230 fs/ext4/page-io.c:356 ext4_writepages+0x1c4b/0x4190 fs/ext4/inode.c:2911 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335 __writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758 wb_check_old_data_flush fs/fs-writeback.c:1860 [inline] wb_do_writeback fs/fs-writeback.c:1913 [inline] wb_workfn+0x1008/0x1790 fs/fs-writeback.c:1942 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. 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