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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 84D7DC33CB1 for ; Wed, 15 Jan 2020 16:15:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5C459214AF for ; Wed, 15 Jan 2020 16:15:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728901AbgAOQPN (ORCPT ); Wed, 15 Jan 2020 11:15:13 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:39399 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726248AbgAOQPN (ORCPT ); Wed, 15 Jan 2020 11:15:13 -0500 Received: by mail-il1-f200.google.com with SMTP id n6so13750765ile.6 for ; Wed, 15 Jan 2020 08:15:13 -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=0Cf6ZphCZYNLk3aMASlUpbTauK9EgyI+kH/XKXJeTh8=; b=J8dd0qWWJtIgwhIjrBMsBA47QOT6ql9JQ8lv7t4jUZn0BzMai0wF8pb24IdyZ/Q6pZ femKMbs0/YzBU+UJeJAivStyltU9JZZbBKOmpJb/OboJkO714EejbCPydAXwWA01LQFP wdZ0T1/c9G17FSSUHkhdY1Hj7nXVXwd9MdOgIB9202kC5iElfPbCt8oLjA5k9TUYZ5l9 mPAZfTjpW/W50v3otxRGCBiQbOw9xNziyENNSQ/FsMuGvexLQm5n0dij1Il+ngldXh5+ nHkCUY3e2wkpGD5UempVowGmRTB4bi9UTkCAvzIWC/T8euB/eQ2H3zLnvDPB81f49nMB 312w== X-Gm-Message-State: APjAAAW93d2y+DZjvhD7VN1cq//CaL4b3jF56a/gMEJIp85UO++VZpvN 2TF2thcp0qnEBg9jvgA1CMp5FYETX4MPPN3sa3kE+WY7tPor X-Google-Smtp-Source: APXvYqwfRsBBbJBifQ7RCfcxQmK6ZLIT8rJpubcScU624bYMWwroDHBbnv0d4FhB+q1u791/Q3siJ2cps49pYQN5i0SrbL5a7ymR MIME-Version: 1.0 X-Received: by 2002:a6b:8ecd:: with SMTP id q196mr22125597iod.136.1579104912850; Wed, 15 Jan 2020 08:15:12 -0800 (PST) Date: Wed, 15 Jan 2020 08:15:12 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000064c69e059c3003f6@google.com> Subject: WARNING in schedule_bh From: syzbot To: axboe@kernel.dk, dri-devel@lists.freedesktop.org, efremov@linux.com, linaro-mm-sig@lists.linaro.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, sumit.semwal@linaro.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 95e20af9 Merge tag 'nfs-for-5.5-2' of git://git.linux-nfs... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17648c21e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4 dashboard link: https://syzkaller.appspot.com/bug?extid=bfc0855888f853dca7ad compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 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+bfc0855888f853dca7ad@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 3 PID: 12339 at drivers/block/floppy.c:985 schedule_bh+0x67/0x70 drivers/block/floppy.c:985 Kernel panic - not syncing: panic_on_warn set ... CPU: 3 PID: 12339 Comm: syz-executor.1 Not tainted 5.5.0-rc6-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:schedule_bh+0x67/0x70 drivers/block/floppy.c:985 Code: fd 48 8b 35 8b 82 ab 07 48 c7 c2 c0 80 00 8a bf 40 00 00 00 4c 89 25 98 7d ab 07 e8 93 51 e3 fc 5b 41 5c 5d c3 e8 09 4a 0b fd <0f> 0b eb ce 0f 1f 44 00 00 55 48 89 e5 e8 f7 49 0b fd 48 c7 c7 10 RSP: 0018:ffffc900075774b0 EFLAGS: 00010212 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc900039f0000 RDX: 00000000000086ed RSI: ffffffff8469ab77 RDI: 0000000000000007 RBP: ffffc900075774c0 R08: ffff888028b50d40 R09: fffffbfff1401019 R10: fffffbfff1401018 R11: ffffffff8a0080c7 R12: ffffffff846a94a0 R13: ffffffff846a94a0 R14: 0000000000000001 R15: 0000000000000001 wait_til_done+0x88/0x370 drivers/block/floppy.c:1977 poll_drive+0xd5/0xf0 drivers/block/floppy.c:2939 floppy_check_events+0x39f/0x440 drivers/block/floppy.c:4107 disk_check_events+0x13b/0x5c0 block/genhd.c:1859 disk_clear_events+0x143/0x318 block/genhd.c:1819 check_disk_change+0x79/0x140 fs/block_dev.c:1488 floppy_open+0x6ba/0xae0 drivers/block/floppy.c:4067 __blkdev_get+0x34f/0x1650 fs/block_dev.c:1604 blkdev_get+0x47/0x2c0 fs/block_dev.c:1736 blkdev_open+0x205/0x290 fs/block_dev.c:1875 do_dentry_open+0x4e6/0x1380 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3420 [inline] path_openat+0x10df/0x4500 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_compat_sys_open fs/open.c:1134 [inline] __se_compat_sys_open fs/open.c:1132 [inline] __ia32_compat_sys_open+0x79/0xb0 fs/open.c:1132 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fa9a39 Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5da4c04 EFLAGS: 00000293 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 00000000f5da4cc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000066666667 RDI: 00000000f5da4cc0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled --- 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#status for how to communicate with syzbot.