====================================================== WARNING: possible circular locking dependency detected 4.14.158-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/18414 is trying to acquire lock: (&rp->fetch_lock){+.+.}, at: [] mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 but task is already holding lock: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_sem){++++}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __might_fault mm/memory.c:4584 [inline] __might_fault+0x143/0x1d0 mm/memory.c:4569 mon_bin_fetch+0x212/0x2e0 drivers/usb/mon/mon_bin.c:928 mon_bin_ioctl+0x1c5/0xb50 drivers/usb/mon/mon_bin.c:1090 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&rp->fetch_lock){+.+.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 __do_fault+0x104/0x390 mm/memory.c:3223 do_cow_fault mm/memory.c:3662 [inline] do_fault mm/memory.c:3761 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0xd96/0x33d0 mm/memory.c:4113 handle_mm_fault+0x293/0x7c0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x465/0x12e0 mm/gup.c:714 populate_vma_page_range+0x18e/0x230 mm/gup.c:1231 __mm_populate+0x198/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2182 [inline] vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1551 [inline] SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_sem); lock(&rp->fetch_lock); lock(&mm->mmap_sem); lock(&rp->fetch_lock); *** DEADLOCK *** 1 lock held by syz-executor.3/18414: #0: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259 stack backtrace: CPU: 1 PID: 18414 Comm: syz-executor.3 Not tainted 4.14.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236 __do_fault+0x104/0x390 mm/memory.c:3223 do_cow_fault mm/memory.c:3662 [inline] do_fault mm/memory.c:3761 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0xd96/0x33d0 mm/memory.c:4113 handle_mm_fault+0x293/0x7c0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x465/0x12e0 mm/gup.c:714 populate_vma_page_range+0x18e/0x230 mm/gup.c:1231 __mm_populate+0x198/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2182 [inline] vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1551 [inline] SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a6f9 RSP: 002b:00007fced8a7ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a6f9 RDX: 0000000001000002 RSI: 0000000000400300 RDI: 0000000020a05000 RBP: 000000000075bf20 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000008012 R11: 0000000000000246 R12: 00007fced8a7b6d4 R13: 00000000004c7982 R14: 00000000004de760 R15: 00000000ffffffff protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'kvm' (ffff8880a64264d0): kobject_uevent_env kobject: 'kvm' (ffff8880a64264d0): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' protocol 88fb is buggy, dev hsr_slave_0 kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'irlan0' (ffff88805ac663f0): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'irlan0' (ffff88805ac663f0): kobject_uevent_env kobject: 'irlan0' (ffff88805ac663f0): fill_kobj_path: path = '/devices/virtual/net/irlan0' kobject: 'queues' (ffff888023cd8f48): kobject_add_internal: parent: 'irlan0', set: '' kobject: 'queues' (ffff888023cd8f48): kobject_uevent_env kobject: 'queues' (ffff888023cd8f48): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff8880802dd3d0): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff8880802dd3d0): kobject_uevent_env kobject: 'rx-0' (ffff8880802dd3d0): fill_kobj_path: path = '/devices/virtual/net/irlan0/queues/rx-0' kobject: 'tx-0' (ffff888091a5ac98): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff888091a5ac98): kobject_uevent_env kobject: 'tx-0' (ffff888091a5ac98): fill_kobj_path: path = '/devices/virtual/net/irlan0/queues/tx-0' kobject: 'brif' (ffff888019849c80): kobject_add_internal: parent: 'irlan0', set: '' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'batman_adv' (ffff88808b073980): kobject_add_internal: parent: 'irlan0', set: '' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env overlayfs: unrecognized mount option "”=ÅòÖ^Æå%b¶I¬§´Am6ë€bl!Z' Ȥ µ|%Ýé¡£©Ä ?_øÙæ”Àjb21‚. {q‘:Ü*" or missing value kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' overlayfs: unrecognized mount option "”=ÅòÖ^Æå%b¶I¬§´Am6ë€bl!Z' Ȥ µ|%Ýé¡£©Ä ?_øÙæ”Àjb21‚. {q‘:Ü*" or missing value kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env net_ratelimit: 14 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env protocol 88fb is buggy, dev hsr_slave_0 kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (ffff88805acaace0): kobject_uevent_env kobject: 'loop0' (ffff88805acaace0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a421a520): kobject_uevent_env kobject: 'loop5' (ffff8880a421a520): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (ffff8880a40d4360): kobject_uevent_env kobject: 'loop1' (ffff8880a40d4360): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (ffff8880a41dd5e0): kobject_uevent_env kobject: 'loop4' (ffff8880a41dd5e0): fill_kobj_path: path = '/devices/virtual/block/loop4'