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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,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 3F1D7ECDFB8 for ; Wed, 18 Jul 2018 12:46:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D71E92075C for ; Wed, 18 Jul 2018 12:46:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D71E92075C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730673AbeGRNXt (ORCPT ); Wed, 18 Jul 2018 09:23:49 -0400 Received: from mail-it0-f69.google.com ([209.85.214.69]:59267 "EHLO mail-it0-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726297AbeGRNXt (ORCPT ); Wed, 18 Jul 2018 09:23:49 -0400 Received: by mail-it0-f69.google.com with SMTP id y13-v6so2359723ita.8 for ; Wed, 18 Jul 2018 05:46:02 -0700 (PDT) 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=S04vMhWZJplmXHxgZLG0UBMl/96/KpGL5zLggkE22/I=; b=AHUom0TqkhPi6iIx9sNOU9EeK/huRvZdgXuJaawDnCND8v4Jc9UufSWZBfEVN5IGOf Z4mV+jM96+FTST40Lve+JON6wNecYw7T9rAVv4z1ilSfxuYyC9IFfZypP9umwhhKOStf 2ff4s4Xniel1M0iUCexVoVf+1BkIQqa6CU3gJhWREQXaSZwGKzm283H7wIpKyMPrZTBc /eutgq2QAn21hZ6/pZgi0AaeRejN9PtL238bvphge5fFhsD5G3gAAMn9CEOcMfeLmw5h TpXDP/sAoB5qK6t3fG00onMXcR34z4XBiEotfSIMvjB0QL/1kOcjwhjidHkjbSBVgT9J aXsQ== X-Gm-Message-State: AOUpUlFCqK56BM6vKTQrgdrd9mc5GukV6DvcmQXUQcBGd7tY6I10McMI GvKiBKI1fJvVEiMEeLhnzltvDw94VAWNfgmTgse8dgB4G+6L X-Google-Smtp-Source: AAOMgpcCXIoTJJcgRe54K+zcH7RyW0QVq0n8K4l+W5qGOKSK/H/czyZGcWz3pN9A2v6vruRP6A+72LiibvlIMjXwjyYe0Vx5g0ea MIME-Version: 1.0 X-Received: by 2002:a24:4643:: with SMTP id j64-v6mr904964itb.18.1531917962397; Wed, 18 Jul 2018 05:46:02 -0700 (PDT) Date: Wed, 18 Jul 2018 05:46:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f961390571457196@google.com> Subject: INFO: task hung in lo_release 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: 3c53776e29f8 Mark HI and TASKLET softirq synchronous git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11bcc252400000 kernel config: https://syzkaller.appspot.com/x/.config?x=6d0ccc9273f0e539 dashboard link: https://syzkaller.appspot.com/bug?extid=a4e4a2663a21c3c3c2b1 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+a4e4a2663a21c3c3c2b1@syzkaller.appspotmail.com INFO: task syz-executor6:4597 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D21208 4597 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_release+0x1f/0x1f0 drivers/block/loop.c:1675 __blkdev_put+0x4f6/0x830 fs/block_dev.c:1793 blkdev_put+0x98/0x540 fs/block_dev.c:1855 blkdev_close+0x8b/0xb0 fs/block_dev.c:1862 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fb70 Code: 00 00 00 00 e8 a1 46 02 00 0f b6 44 24 1f 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 48 8d 05 a9 97 4a 00 48 89 04 24 48 c7 44 <24> 08 11 00 00 00 e8 55 bd 01 00 0f 0b e8 ce a3 04 00 e9 59 ff ff RSP: 002b:00007fff1227ac48 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000013 RCX: 000000000040fb70 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000013 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007fff1227b2f0 R15: 00000000007034c0 INFO: task blkid:18494 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23544 18494 7500 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f59afda6120 Code: Bad RIP value. RSP: 002b:00007fff6d16cf88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f59afda6120 RDX: 00007fff6d16df33 RSI: 0000000000000000 RDI: 00007fff6d16df33 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000f9d030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 INFO: task syz-executor5:18515 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D24192 18515 4596 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007f34f5370c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f34f53716d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000016 RBP: 000000000072bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004be01c R14: 00000000004ccb20 R15: 0000000000000001 INFO: task syz-executor1:18498 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D22440 18498 4593 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007f6d63ca6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6d63ca76d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 000000000000001a RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdff1 R14: 00000000004ccaf0 R15: 0000000000000000 INFO: task syz-executor3:18521 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D25408 18521 4592 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007fa34c3a2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa34c3a36d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000017 RBP: 000000000072bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdff1 R14: 00000000004ccaf0 R15: 0000000000000001 INFO: task syz-executor3:18522 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D24152 18522 4592 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fd11 Code: 48 89 1d ea cf 00 02 0f b6 4c 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 00 0f 85 80 01 00 00 48 8d 05 8c 00 02 48 89 04 24 48 89 74 24 08 48 c7 44 24 10 00 00 00 20 e8 RSP: 002b:00007fa34c381a80 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000200038a8 RCX: 000000000040fd11 RDX: 00007fa34c381afa RSI: 0000000000000002 RDI: 00007fa34c381af0 RBP: 0000000000000009 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000009 R14: 00000000004d3d08 R15: 0000000000000002 INFO: task syz-executor4:18506 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D24192 18506 4595 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007f1b8f363c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1b8f3646d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdff1 R14: 00000000004ccaf0 R15: 0000000000000000 INFO: task syz-executor7:18507 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D23864 18507 8786 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007fcbe4dd6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcbe4dd76d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000017 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdff1 R14: 00000000004ccaf0 R15: 0000000000000000 INFO: task syz-executor2:18514 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D21960 18514 4590 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fd11 Code: 48 89 1d ea cf 00 02 0f b6 4c 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 00 0f 85 80 01 00 00 48 8d 05 8c 00 02 48 89 04 24 48 89 74 24 08 48 c7 44 24 10 00 00 00 20 e8 RSP: 002b:00007fe34706ca80 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000200002c8 RCX: 000000000040fd11 RDX: 00007fe34706cafa RSI: 0000000000000002 RDI: 00007fe34706caf0 RBP: 0000000000000005 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000017 R13: 0000000000000005 R14: 00000000004d3d08 R15: 0000000000000000 INFO: task blkid:18513 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #152 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23984 18513 9176 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4bc31c9120 Code: Bad RIP value. RSP: 002b:00007fff8c7b7858 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4bc31c9120 RDX: 00007fff8c7b8f33 RSI: 0000000000000000 RDI: 00007fff8c7b8f33 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000db8030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/902: #0: 000000004f60bbd2 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4455: #0: 0000000086a2d206 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4545: #0: 00000000ece833eb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000536bed00 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4546: #0: 00000000180e8f60 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000008efac671 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4547: #0: 00000000ca308631 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007c05fef3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4548: #0: 000000009d93809c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004c489ffa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4549: #0: 00000000ec3b322c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000107aeb96 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4550: #0: 000000006d1a7b96 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000564c003d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4551: #0: 000000003cba543a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000149a289b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor6/4597: #0: 0000000033676c6d (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xc2/0x830 fs/block_dev.c:1780 #1: 00000000127b5bfb (loop_index_mutex){+.+.}, at: lo_release+0x1f/0x1f0 drivers/block/loop.c:1675 2 locks held by blkid/18494: #0: 000000000efc6462 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000127b5bfb (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 1 lock held by syz-executor5/18515: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 1 lock held by syz-executor1/18498: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 1 lock held by syz-executor3/18521: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 2 locks held by syz-executor3/18522: #0: 00000000399ff791 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000127b5bfb (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 1 lock held by syz-executor4/18506: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 1 lock held by syz-executor0/18508: 1 lock held by syz-executor7/18507: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_control_ioctl+0x91/0x540 drivers/block/loop.c:1999 1 lock held by syz-executor2/18514: #0: 000000000efc6462 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 1 lock held by blkid/18513: #0: 0000000033676c6d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 1 lock held by blkid/18520: #0: 00000000127b5bfb (loop_index_mutex){+.+.}, at: loop_probe+0x82/0x1d0 drivers/block/loop.c:1979 1 lock held by blkid/18524: #0: 00000000399ff791 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 902 Comm: khungtaskd Not tainted 4.18.0-rc5+ #152 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 --- This bug is generated by a bot. 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