From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f198.google.com (mail-it1-f198.google.com [209.85.166.198]) by kanga.kvack.org (Postfix) with ESMTP id 849CD8E0001 for ; Tue, 22 Jan 2019 09:08:07 -0500 (EST) Received: by mail-it1-f198.google.com with SMTP id o205so13522345itc.2 for ; Tue, 22 Jan 2019 06:08:07 -0800 (PST) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id m130sor8110445ioa.78.2019.01.22.06.08.05 for (Google Transport Security); Tue, 22 Jan 2019 06:08:05 -0800 (PST) MIME-Version: 1.0 Date: Tue, 22 Jan 2019 06:08:04 -0800 In-Reply-To: Message-ID: <00000000000089b42c05800c8145@google.com> Subject: Re: possible deadlock in __do_page_fault From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: ak@linux.intel.com, akpm@linux-foundation.org, arve@android.com, dvyukov@google.com, gregkh@linuxfoundation.org, hannes@cmpxchg.org, jack@suse.cz, joel@joelfernandes.org, joelaf@google.com, jrdr.linux@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, maco@android.com, mgorman@techsingularity.net, penguin-kernel@i-love.sakura.ne.jp, syzkaller-bugs@googlegroups.com, tkjos@android.com, tkjos@google.com Hello, syzbot has tested the proposed patch but the reproducer still triggered crash: possible deadlock in __do_page_fault 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 ====================================================== WARNING: possible circular locking dependency detected 5.0.0-rc3+ #1 Not tainted ------------------------------------------------------ syz-executor2/7371 is trying to acquire lock: 00000000435ca279 (&mm->mmap_sem){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] 00000000435ca279 (&mm->mmap_sem){++++}, at: __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 but task is already holding lock: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:757 [inline] 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: generic_file_write_iter+0xe5/0x6a0 mm/filemap.c:3358 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#11){+.+.}: down_write+0x8a/0x130 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:757 [inline] shmem_fallocate+0x168/0x1200 mm/shmem.c:2633 ashmem_shrink_scan drivers/staging/android/ashmem.c:455 [inline] ashmem_shrink_scan+0x239/0x630 drivers/staging/android/ashmem.c:439 ashmem_ioctl+0x38a/0x12c0 drivers/staging/android/ashmem.c:797 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' do_syscall_64+0x1a3/0x800 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+0x12f/0x1670 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:1867 [inline] mmap_region+0xde5/0x1ca0 mm/mmap.c:1786 do_mmap+0xa09/0x1220 mm/mmap.c:1559 do_mmap_pgoff include/linux/mm.h:2379 [inline] vm_mmap_pgoff+0x20b/0x2b0 mm/util.c:350 ksys_mmap_pgoff+0x4f8/0x650 mm/mmap.c:1609 __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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env down_read+0x8d/0x120 kernel/locking/rwsem.c:24 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 do_page_fault+0xe6/0x7d8 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 fault_in_pages_readable include/linux/pagemap.h:611 [inline] iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:425 generic_perform_write+0x202/0x6b0 mm/filemap.c:3198 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 generic_file_write_iter+0x34e/0x6a0 mm/filemap.c:3361 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 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#11 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#11); lock(ashmem_mutex); lock(&sb->s_type->i_mutex_key#11); lock(&mm->mmap_sem); *** DEADLOCK *** 2 locks held by syz-executor2/7371: #0: 00000000cdd032c7 (sb_writers#5){.+.+}, at: file_start_write include/linux/fs.h:2815 [inline] #0: 00000000cdd032c7 (sb_writers#5){.+.+}, at: vfs_write+0x429/0x580 fs/read_write.c:548 kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env #1: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:757 [inline] #1: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: generic_file_write_iter+0xe5/0x6a0 mm/filemap.c:3358 stack backtrace: kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' CPU: 1 PID: 7371 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #1 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env 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+0x1db/0x2d0 lib/dump_stack.c:113 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2350 [inline] __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 down_read+0x8d/0x120 kernel/locking/rwsem.c:24 do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 do_page_fault+0xe6/0x7d8 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:611 [inline] RIP: 0010:iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:425 Code: 89 f6 41 88 57 e0 e8 b8 2f f4 fd 45 85 f6 74 c1 e9 70 fe ff ff e8 29 2e f4 fd 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f 1f 00 41 88 57 d0 31 ff 89 de e8 85 2f f4 fd 85 db RSP: 0018:ffff8881c52478a8 EFLAGS: 00010293 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000002020053f RDX: 0000000000000000 RSI: ffffffff838db067 RDI: 0000000000000007 RBP: ffff8881c5247948 R08: ffff8881c4c18240 R09: fffff94000d13e07 R10: fffff94000d13e06 R11: ffffea000689f037 R12: 0000000000001000 R13: 0000000000001000 R14: 0000000000000000 R15: ffff8881c5247920 generic_perform_write+0x202/0x6b0 mm/filemap.c:3198 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 generic_file_write_iter+0x34e/0x6a0 mm/filemap.c:3361 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 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 kobject: 'loop5' (000000008a2391db): kobject_uevent_env RSP: 002b:00007f51cc66ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 00000000fffffda2 RSI: 0000000020000540 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f51cc66b6d4 R13: 00000000004c554e R14: 00000000004d8e68 R15: 00000000ffffffff kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' Tested on: commit: 48b161983ae5 Merge tag 'xarray-5.0-rc3' of git://git.infra.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d8ae5b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=ae7255cd515c8fef compiler: gcc (GCC) 9.0.0 20181231 (experimental) 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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 B927BC282C3 for ; Tue, 22 Jan 2019 14:08:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org 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Tue, 22 Jan 2019 06:08:04 -0800 (PST) Date: Tue, 22 Jan 2019 06:08:04 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000089b42c05800c8145@google.com> Subject: Re: possible deadlock in __do_page_fault From: syzbot To: ak@linux.intel.com, akpm@linux-foundation.org, arve@android.com, dvyukov@google.com, gregkh@linuxfoundation.org, hannes@cmpxchg.org, jack@suse.cz, joel@joelfernandes.org, joelaf@google.com, jrdr.linux@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, maco@android.com, mgorman@techsingularity.net, penguin-kernel@i-love.sakura.ne.jp, syzkaller-bugs@googlegroups.com, tkjos@android.com, tkjos@google.com Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20190122140804.Cm6rG9YmrhW7WI-YUfaNnt0fAt2TsySsn48tr477p4s@z> Hello, syzbot has tested the proposed patch but the reproducer still triggered crash: possible deadlock in __do_page_fault 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 ====================================================== WARNING: possible circular locking dependency detected 5.0.0-rc3+ #1 Not tainted ------------------------------------------------------ syz-executor2/7371 is trying to acquire lock: 00000000435ca279 (&mm->mmap_sem){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] 00000000435ca279 (&mm->mmap_sem){++++}, at: __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 but task is already holding lock: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:757 [inline] 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: generic_file_write_iter+0xe5/0x6a0 mm/filemap.c:3358 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#11){+.+.}: down_write+0x8a/0x130 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:757 [inline] shmem_fallocate+0x168/0x1200 mm/shmem.c:2633 ashmem_shrink_scan drivers/staging/android/ashmem.c:455 [inline] ashmem_shrink_scan+0x239/0x630 drivers/staging/android/ashmem.c:439 ashmem_ioctl+0x38a/0x12c0 drivers/staging/android/ashmem.c:797 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' do_syscall_64+0x1a3/0x800 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+0x12f/0x1670 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:1867 [inline] mmap_region+0xde5/0x1ca0 mm/mmap.c:1786 do_mmap+0xa09/0x1220 mm/mmap.c:1559 do_mmap_pgoff include/linux/mm.h:2379 [inline] vm_mmap_pgoff+0x20b/0x2b0 mm/util.c:350 ksys_mmap_pgoff+0x4f8/0x650 mm/mmap.c:1609 __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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env down_read+0x8d/0x120 kernel/locking/rwsem.c:24 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 do_page_fault+0xe6/0x7d8 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 fault_in_pages_readable include/linux/pagemap.h:611 [inline] iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:425 generic_perform_write+0x202/0x6b0 mm/filemap.c:3198 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 generic_file_write_iter+0x34e/0x6a0 mm/filemap.c:3361 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 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#11 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#11); lock(ashmem_mutex); lock(&sb->s_type->i_mutex_key#11); lock(&mm->mmap_sem); *** DEADLOCK *** 2 locks held by syz-executor2/7371: #0: 00000000cdd032c7 (sb_writers#5){.+.+}, at: file_start_write include/linux/fs.h:2815 [inline] #0: 00000000cdd032c7 (sb_writers#5){.+.+}, at: vfs_write+0x429/0x580 fs/read_write.c:548 kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env #1: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:757 [inline] #1: 00000000b64def52 (&sb->s_type->i_mutex_key#11){+.+.}, at: generic_file_write_iter+0xe5/0x6a0 mm/filemap.c:3358 stack backtrace: kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' CPU: 1 PID: 7371 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #1 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env 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+0x1db/0x2d0 lib/dump_stack.c:113 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2350 [inline] __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 down_read+0x8d/0x120 kernel/locking/rwsem.c:24 do_user_addr_fault arch/x86/mm/fault.c:1426 [inline] __do_page_fault+0x9c2/0xd60 arch/x86/mm/fault.c:1541 do_page_fault+0xe6/0x7d8 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:611 [inline] RIP: 0010:iov_iter_fault_in_readable+0x377/0x450 lib/iov_iter.c:425 Code: 89 f6 41 88 57 e0 e8 b8 2f f4 fd 45 85 f6 74 c1 e9 70 fe ff ff e8 29 2e f4 fd 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f 1f 00 41 88 57 d0 31 ff 89 de e8 85 2f f4 fd 85 db RSP: 0018:ffff8881c52478a8 EFLAGS: 00010293 kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000002020053f RDX: 0000000000000000 RSI: ffffffff838db067 RDI: 0000000000000007 RBP: ffff8881c5247948 R08: ffff8881c4c18240 R09: fffff94000d13e07 R10: fffff94000d13e06 R11: ffffea000689f037 R12: 0000000000001000 R13: 0000000000001000 R14: 0000000000000000 R15: ffff8881c5247920 generic_perform_write+0x202/0x6b0 mm/filemap.c:3198 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 generic_file_write_iter+0x34e/0x6a0 mm/filemap.c:3361 kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 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 kobject: 'loop5' (000000008a2391db): kobject_uevent_env RSP: 002b:00007f51cc66ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 00000000fffffda2 RSI: 0000000020000540 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f51cc66b6d4 R13: 00000000004c554e R14: 00000000004d8e68 R15: 00000000ffffffff kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (00000000a9b29aa3): kobject_uevent_env kobject: 'loop0' (00000000a9b29aa3): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000bfa624b6): kobject_uevent_env kobject: 'loop3' (00000000bfa624b6): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (000000008a2391db): kobject_uevent_env kobject: 'loop5' (000000008a2391db): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000019bfd72c): kobject_uevent_env kobject: 'loop2' (0000000019bfd72c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000893eaf09): kobject_uevent_env kobject: 'loop1' (00000000893eaf09): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (00000000e9e52bda): kobject_uevent_env kobject: 'loop4' (00000000e9e52bda): fill_kobj_path: path = '/devices/virtual/block/loop4' Tested on: commit: 48b161983ae5 Merge tag 'xarray-5.0-rc3' of git://git.infra.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d8ae5b400000 kernel config: https://syzkaller.appspot.com/x/.config?x=ae7255cd515c8fef compiler: gcc (GCC) 9.0.0 20181231 (experimental)