======================================================
WARNING: possible circular locking dependency detected
4.14.161-syzkaller #0 Not tainted
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
------------------------------------------------------
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
syz-executor.3/1509 is trying to acquire lock:
 (event_mutex){+.+.}, at: [<ffffffff81633238>] perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234

but task is already holding lock:
PM: Basic memory bitmaps freed
 (&event->child_mutex){+.+.}, at: [<ffffffff816db3c7>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env

-> #5 (&event->child_mutex){+.+.}:
       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
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4682
       _perf_ioctl kernel/events/core.c:4866 [inline]
       perf_ioctl+0x1d9/0xdf0 kernel/events/core.c:4878
       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

-> #4 (&cpuctx_mutex){+.+.}:
       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
PM: Marking nosave pages: [mem 0x00000000-0x00000fff]
       perf_event_init_cpu+0xc2/0x170 kernel/events/core.c:11223
       perf_event_init+0x2d8/0x31a kernel/events/core.c:11270
       start_kernel+0x3b6/0x6fd init/main.c:620
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:380
       secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
PM: Marking nosave pages: [mem 0x0009f000-0x000fffff]

-> #3 (pmus_lock){+.+.}:
       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
       perf_event_init_cpu+0x2f/0x170 kernel/events/core.c:11217
       cpuhp_invoke_callback+0x1ea/0x1ab0 kernel/cpu.c:184
       cpuhp_up_callbacks kernel/cpu.c:573 [inline]
       _cpu_up+0x228/0x530 kernel/cpu.c:1135
PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff]
       do_cpu_up kernel/cpu.c:1170 [inline]
       do_cpu_up+0xa6/0x160 kernel/cpu.c:1142
       cpu_up+0x1b/0x20 kernel/cpu.c:1178
       smp_init+0x157/0x170 kernel/smp.c:578
       kernel_init_freeable+0x30b/0x532 init/main.c:1066
       kernel_init+0x12/0x162 init/main.c:998
       ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
PM: Basic memory bitmaps created

-> #2 (cpu_hotplug_lock.rw_sem){++++}:
       lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
       percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
       cpus_read_lock+0x3d/0xc0 kernel/cpu.c:295
       static_key_slow_inc+0x13/0x30 kernel/jump_label.c:123
PM: Basic memory bitmaps freed
       tracepoint_add_func kernel/tracepoint.c:223 [inline]
       tracepoint_probe_register_prio+0x4d6/0x6d0 kernel/tracepoint.c:283
       tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
       trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305
       perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
       perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
       perf_trace_init+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
       perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
       perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
       perf_init_event kernel/events/core.c:9380 [inline]
       perf_event_alloc.part.0+0xd92/0x25c0 kernel/events/core.c:9640
       perf_event_alloc kernel/events/core.c:9993 [inline]
       SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
       SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
 (tracepoints_mutex){+.+.}:
       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
       tracepoint_probe_register_prio+0x36/0x6d0 kernel/tracepoint.c:279
       tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
       trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
       perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
       perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
       perf_trace_init+0x449/0xaa0 kernel/trace/trace_event_perf.c:221
       perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106
       perf_try_init_event+0x164/0x200 kernel/events/core.c:9342
       perf_init_event kernel/events/core.c:9380 [inline]
       perf_event_alloc.part.0+0xd92/0x25c0 kernel/events/core.c:9640
       perf_event_alloc kernel/events/core.c:9993 [inline]
       SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
       SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (event_mutex){+.+.}:
       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
       perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
       tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
       _free_event+0x330/0xe70 kernel/events/core.c:4238
       free_event+0x38/0x50 kernel/events/core.c:4265
       perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
       perf_release+0x37/0x50 kernel/events/core.c:4435
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
       __fput+0x275/0x7a0 fs/file_table.c:210
       ____fput+0x16/0x20 fs/file_table.c:244
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
       task_work_run+0x114/0x190 kernel/task_work.c:113
       tracehook_notify_resume include/linux/tracehook.h:191 [inline]
       exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
       prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
       syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
       do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

other info that might help us debug this:

kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
Chain exists of:
  event_mutex --> &cpuctx_mutex --> &event->child_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&event->child_mutex);
                               lock(&cpuctx_mutex);
                               lock(&event->child_mutex);
  lock(event_mutex);

 *** DEADLOCK ***

2 locks held by syz-executor.3/1509:
 #0:  (&ctx->mutex){+.+.}, at: [<ffffffff816db3bd>] perf_event_release_kernel+0x1fd/0x880 kernel/events/core.c:4396
 #1:  (&event->child_mutex){+.+.}, at: [<ffffffff816db3c7>] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397

stack backtrace:
CPU: 0 PID: 1509 Comm: syz-executor.3 Not tainted 4.14.161-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
 perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
 tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090
 _free_event+0x330/0xe70 kernel/events/core.c:4238
 free_event+0x38/0x50 kernel/events/core.c:4265
 perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409
 perf_release+0x37/0x50 kernel/events/core.c:4435
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x114/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x414ae1
RSP: 002b:00007fff56c934e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000414ae1
RDX: 0000001b33520000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007fff56c935c0 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000156a3c R14: 0000000000761718 R15: 000000000075bf2c
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a417f6e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a417f6e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41c7760): kobject_uevent_env
kobject: 'loop3' (ffff8880a41c7760): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a42420a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a42420a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40c0d60): kobject_uevent_env
kobject: 'loop0' (ffff8880a40c0d60): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a4112de0): kobject_uevent_env
kobject: 'loop1' (ffff8880a4112de0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a42317e0): kobject_uevent_env
kobject: 'loop4' (ffff8880a42317e0): fill_kobj_path: path = '/devices/virtual/block/loop4'