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 CB625ECE566 for ; Thu, 20 Sep 2018 21:04:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 70C3621532 for ; Thu, 20 Sep 2018 21:04:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 70C3621532 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 S2388541AbeIUCta (ORCPT ); Thu, 20 Sep 2018 22:49:30 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:42301 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388165AbeIUCta (ORCPT ); Thu, 20 Sep 2018 22:49:30 -0400 Received: by mail-io1-f69.google.com with SMTP id m13-v6so14834345ioq.9 for ; Thu, 20 Sep 2018 14:04:05 -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=c7nNmWjRrOXYYXVPxEP8yCerT55c6jCvhH2lQedrp9k=; b=Wj85whSejhPWyUp1fM2nRbdxRS8+jGniNE+yyTSRXK6H8CcuD5oG7i0RlUZgbilmKW z4kDWK70ObhbeJN8iJPZk898XdJeL3ePGDdcZ/vROSScm8oX4W2shuHQqGQ00fipNTdX Xs+I7b4IOdSwL78TNep4x6andP4KLZg88QOshUcMp7aXA+dHH+X3Fw9UpH2xJgEjR4fO /ITJgtVmKabfah6IS7E2gJfsC7BNI49QtGMIS4FCsTZWfVoM5kcgyctz/0xaNW47VVjO vone2z4ZdkLThoa443HAHge+2aGcGdSfV5SkDbliAs/4FSrol3hB+hWtllPGWjo9q5KE pMhQ== X-Gm-Message-State: APzg51AnxwexQ544+eXrLWOEx1fjm7X1HTq0xSOCVWAnqYEyI4CcEchT ux/VSzhsYG5TmTXFRFS5eBfXj62dOQiyF9XeCZX48+DG4Ru6 X-Google-Smtp-Source: ANB0Vdbu8sGt8Zp9rmor11msFqrgmdjpmpv1GwRX7VWzAe6u/Ilq6I5DiW4kazCu4TZultnYvgpVrnlUnnZEYJXvdQ+9EuJJLHwn MIME-Version: 1.0 X-Received: by 2002:a6b:6312:: with SMTP id p18-v6mr32294422iog.43.1537477445128; Thu, 20 Sep 2018 14:04:05 -0700 (PDT) Date: Thu, 20 Sep 2018 14:04:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f7a28e057653dc6e@google.com> Subject: possible deadlock in __do_page_fault From: syzbot To: ak@linux.intel.com, akpm@linux-foundation.org, hannes@cmpxchg.org, jack@suse.cz, jrdr.linux@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mawilcox@microsoft.com, mgorman@techsingularity.net, 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: a0cb0cabe4bb Add linux-next specific files for 20180920 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15139721400000 kernel config: https://syzkaller.appspot.com/x/.config?x=786006c5dafbadf6 dashboard link: https://syzkaller.appspot.com/bug?extid=a76129f18c89f3e2ddd4 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+a76129f18c89f3e2ddd4@syzkaller.appspotmail.com ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc4-next-20180920+ #76 Not tainted ------------------------------------------------------ syz-executor3/21327 is trying to acquire lock: 000000009bc5286f (&mm->mmap_sem){++++}, at: __do_page_fault+0xb61/0xec0 arch/x86/mm/fault.c:1333 but task is already holding lock: 00000000a2c51c08 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_lock include/linux/fs.h:745 [inline] 00000000a2c51c08 (&sb->s_type->i_mutex_key#10){+.+.}, at: generic_file_write_iter+0xed/0x870 mm/filemap.c:3304 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#10){+.+.}: down_write+0x8a/0x130 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:745 [inline] shmem_fallocate+0x18b/0x12c0 mm/shmem.c:2651 ashmem_shrink_scan+0x238/0x660 drivers/staging/android/ashmem.c:455 ashmem_ioctl+0x3ae/0x13a0 drivers/staging/android/ashmem.c:797 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (ashmem_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x166/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 ashmem_mmap+0x55/0x520 drivers/staging/android/ashmem.c:361 call_mmap include/linux/fs.h:1830 [inline] mmap_region+0xe82/0x1cd0 mm/mmap.c:1762 do_mmap+0xa10/0x1220 mm/mmap.c:1535 do_mmap_pgoff include/linux/mm.h:2298 [inline] vm_mmap_pgoff+0x213/0x2c0 mm/util.c:357 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 down_read+0x8d/0x120 kernel/locking/rwsem.c:24 __do_page_fault+0xb61/0xec0 arch/x86/mm/fault.c:1333 do_page_fault+0xed/0x7d1 arch/x86/mm/fault.c:1472 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1139 fault_in_pages_readable include/linux/pagemap.h:601 [inline] iov_iter_fault_in_readable+0x1b4/0x450 lib/iov_iter.c:421 generic_perform_write+0x216/0x6a0 mm/filemap.c:3144 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3279 generic_file_write_iter+0x436/0x870 mm/filemap.c:3307 call_write_iter include/linux/fs.h:1825 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_pwritev+0x1cc/0x280 fs/read_write.c:1093 __do_sys_pwritev fs/read_write.c:1140 [inline] __se_sys_pwritev fs/read_write.c:1135 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1135 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &mm->mmap_sem --> ashmem_mutex --> &sb->s_type->i_mutex_key#10 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock(ashmem_mutex); lock(&sb->s_type->i_mutex_key#10); lock(&mm->mmap_sem); *** DEADLOCK *** 2 locks held by syz-executor3/21327: #0: 000000003de4eab1 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2784 [inline] #0: 000000003de4eab1 (sb_writers#3){.+.+}, at: vfs_writev+0x2bd/0x360 fs/read_write.c:1003 #1: 00000000a2c51c08 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_lock include/linux/fs.h:745 [inline] #1: 00000000a2c51c08 (&sb->s_type->i_mutex_key#10){+.+.}, at: generic_file_write_iter+0xed/0x870 mm/filemap.c:3304 stack backtrace: CPU: 1 PID: 21327 Comm: syz-executor3 Not tainted 4.19.0-rc4-next-20180920+ #76 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+0x1d3/0x2c4 lib/dump_stack.c:113 print_circular_bug.isra.33.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x33e4/0x4ec0 kernel/locking/lockdep.c:3411 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 down_read+0x8d/0x120 kernel/locking/rwsem.c:24 __do_page_fault+0xb61/0xec0 arch/x86/mm/fault.c:1333 do_page_fault+0xed/0x7d1 arch/x86/mm/fault.c:1472 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1139 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1b4/0x450 lib/iov_iter.c:421 Code: fd 49 39 dc 76 17 eb 3c e8 e9 a0 ef fd 49 81 c4 00 10 00 00 4c 39 a5 28 ff ff ff 72 2e e8 d4 a0 ef fd 0f 1f 00 0f ae e8 31 db <41> 8a 04 24 0f 1f 00 31 ff 89 de 88 85 58 ff ff ff e8 c6 a1 ef fd RSP: 0018:ffff88018dfe7650 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90005662000 RDX: 00000000000001c2 RSI: ffffffff838daf1c RDI: 0000000000000005 RBP: ffff88018dfe7728 R08: ffff880198ad2240 R09: ffffed00319dc039 R10: ffffed00319dc039 R11: ffff88018cee01cb R12: 0000000020012000 R13: 0000000000000001 R14: 0000000000000001 R15: ffff88018dfe7c50 generic_perform_write+0x216/0x6a0 mm/filemap.c:3144 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3279 generic_file_write_iter+0x436/0x870 mm/filemap.c:3307 call_write_iter include/linux/fs.h:1825 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_pwritev+0x1cc/0x280 fs/read_write.c:1093 __do_sys_pwritev fs/read_write.c:1140 [inline] __se_sys_pwritev fs/read_write.c:1135 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1135 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f96ef162c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 00007f96ef1636d4 RCX: 0000000000457679 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4a88 R14: 00000000004c31d4 R15: 0000000000000000 kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' FAULT_FLAG_ALLOW_RETRY missing 30 kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' CPU: 1 PID: 21327 Comm: syz-executor3 Not tainted 4.19.0-rc4-next-20180920+ #76 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+0x1d3/0x2c4 lib/dump_stack.c:113 handle_userfault.cold.33+0x47/0x62 fs/userfaultfd.c:432 do_anonymous_page mm/memory.c:2915 [inline] handle_pte_fault mm/memory.c:3732 [inline] __handle_mm_fault+0x45ed/0x53e0 mm/memory.c:3858 handle_mm_fault+0x54f/0xc70 mm/memory.c:3895 __do_page_fault+0x673/0xec0 arch/x86/mm/fault.c:1397 do_page_fault+0xed/0x7d1 arch/x86/mm/fault.c:1472 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1139 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1b4/0x450 lib/iov_iter.c:421 Code: fd 49 39 dc 76 17 eb 3c e8 e9 a0 ef fd 49 81 c4 00 10 00 00 4c 39 a5 28 ff ff ff 72 2e e8 d4 a0 ef fd 0f 1f 00 0f ae e8 31 db <41> 8a 04 24 0f 1f 00 31 ff 89 de 88 85 58 ff ff ff e8 c6 a1 ef fd RSP: 0018:ffff88018dfe7650 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90005662000 RDX: 00000000000001c2 RSI: ffffffff838daf1c RDI: 0000000000000005 RBP: ffff88018dfe7728 R08: ffff880198ad2240 R09: ffffed00319dc039 R10: ffffed00319dc039 R11: ffff88018cee01cb R12: 0000000020012000 R13: 0000000000000001 R14: 0000000000000001 R15: ffff88018dfe7c50 generic_perform_write+0x216/0x6a0 mm/filemap.c:3144 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3279 generic_file_write_iter+0x436/0x870 mm/filemap.c:3307 call_write_iter include/linux/fs.h:1825 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_pwritev+0x1cc/0x280 fs/read_write.c:1093 __do_sys_pwritev fs/read_write.c:1140 [inline] __se_sys_pwritev fs/read_write.c:1135 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1135 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f96ef162c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 00007f96ef1636d4 RCX: 0000000000457679 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4a88 R14: 00000000004c31d4 R15: 0000000000000000 kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' audit: type=1326 audit(2000000012.020:46): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=21534 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x0 kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' audit: type=1326 audit(2000000012.950:47): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=21566 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x0 kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop2' (00000000dc629c38): kobject_uevent_env kobject: 'loop2' (00000000dc629c38): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000aff594d4): kobject_uevent_env kobject: 'loop3' (00000000aff594d4): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000004119f3b1): kobject_uevent_env kobject: 'loop4' (000000004119f3b1): fill_kobj_path: path = '/devices/virtual/block/loop4' audit: type=1326 audit(2000000013.460:48): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=21585 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x0 audit: type=1326 audit(2000000013.510:49): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=21588 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x0 kobject: 'loop1' (00000000980d23a1): kobject_uevent_env kobject: 'loop1' (00000000980d23a1): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000ee0adfaf): kobject_uevent_env kobject: 'loop0' (00000000ee0adfaf): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000699d1086): kobject_uevent_env audit: type=1326 audit(2000000013.800:50): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=21601 comm="syz-executor0" exe="/root/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x0 kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000699d1086): kobject_uevent_env kobject: 'loop5' (00000000699d1086): fill_kobj_path: path = '/devices/virtual/block/loop5' --- 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.