======================================================
WARNING: possible circular locking dependency detected
4.14.160-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/12523 is trying to acquire lock:
 (&event->child_mutex){+.+.}, at: [<ffffffff816c5600>] perf_read_group kernel/events/core.c:4536 [inline]
 (&event->child_mutex){+.+.}, at: [<ffffffff816c5600>] __perf_read kernel/events/core.c:4618 [inline]
 (&event->child_mutex){+.+.}, at: [<ffffffff816c5600>] perf_read+0x2c0/0x820 kernel/events/core.c:4633

but task is already holding lock:
 (&cpuctx_mutex){+.+.}, at: [<ffffffff816c2cf0>] perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&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
       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

-> #4 (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
       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

-> #3 (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
       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
       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
       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
       do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #2 (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
       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
       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

-> #1 (event_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
       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

-> #0 (&event->child_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_read_group kernel/events/core.c:4536 [inline]
       __perf_read kernel/events/core.c:4618 [inline]
       perf_read+0x2c0/0x820 kernel/events/core.c:4633
       __vfs_read+0x105/0x6a0 fs/read_write.c:411
       vfs_read+0x137/0x350 fs/read_write.c:447
       SYSC_read fs/read_write.c:574 [inline]
       SyS_read+0xfd/0x230 fs/read_write.c:567
       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:

Chain exists of:
  &event->child_mutex --> pmus_lock --> &cpuctx_mutex

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

1 lock held by syz-executor.2/12523:
 #0:  (&cpuctx_mutex){+.+.}, at: [<ffffffff816c2cf0>] perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235

stack backtrace:
CPU: 0 PID: 12523 Comm: syz-executor.2 Not tainted 4.14.160-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_read_group kernel/events/core.c:4536 [inline]
 __perf_read kernel/events/core.c:4618 [inline]
 perf_read+0x2c0/0x820 kernel/events/core.c:4633
 __vfs_read+0x105/0x6a0 fs/read_write.c:411
 vfs_read+0x137/0x350 fs/read_write.c:447
 SYSC_read fs/read_write.c:574 [inline]
 SyS_read+0xfd/0x230 fs/read_write.c:567
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a919
RSP: 002b:00007f19b8b5dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000000000128 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f19b8b5e6d4
R13: 00000000004c793a R14: 00000000004e06d0 R15: 00000000ffffffff
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'eql' (ffff888050dc1d70): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'kvm' (ffff8882194c1290): kobject_uevent_env
kobject: 'eql' (ffff888050dc1d70): kobject_uevent_env
kobject: 'eql' (ffff888050dc1d70): fill_kobj_path: path = '/devices/virtual/net/eql'
kobject: 'queues' (ffff88808d5cfb48): kobject_add_internal: parent: 'eql', set: '<NULL>'
kobject: 'queues' (ffff88808d5cfb48): kobject_uevent_env
kobject: 'queues' (ffff88808d5cfb48): kobject_uevent_env: filter function caused the event to drop!
kobject: 'rx-0' (ffff88809978b790): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'rx-0' (ffff88809978b790): kobject_uevent_env
kobject: 'rx-0' (ffff88809978b790): fill_kobj_path: path = '/devices/virtual/net/eql/queues/rx-0'
kobject: 'tx-0' (ffff8880805a4358): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'tx-0' (ffff8880805a4358): kobject_uevent_env
kobject: 'tx-0' (ffff8880805a4358): fill_kobj_path: path = '/devices/virtual/net/eql/queues/tx-0'
kobject: 'batman_adv' (ffff888093886d80): kobject_add_internal: parent: 'eql', set: '<NULL>'
kobject: 'kvm' (ffff8882194c1290): kobject_uevent_env
kobject: 'kvm' (ffff8882194c1290): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'kvm' (ffff8882194c1290): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff8882194c1290): kobject_uevent_env
kobject: 'kvm' (ffff8882194c1290): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'kvm' (ffff8882194c1290): kobject_uevent_env
kobject: 'kvm' (ffff8882194c1290): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'batman_adv' (ffff888093886d80): kobject_uevent_env
kobject: 'batman_adv' (ffff888093886d80): kobject_uevent_env: filter function caused the event to drop!
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'batman_adv' (ffff888093886d80): kobject_cleanup, parent           (null)
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'batman_adv' (ffff888093886d80): calling ktype release
kobject: (ffff888093886d80): dynamic_kobj_release
kobject: 'batman_adv': free name
kobject: 'rx-0' (ffff88809978b790): kobject_cleanup, parent ffff88808d5cfb48
kobject: 'rx-0' (ffff88809978b790): auto cleanup 'remove' event
kobject: 'rx-0' (ffff88809978b790): kobject_uevent_env
kobject: 'rx-0' (ffff88809978b790): fill_kobj_path: path = '/devices/virtual/net/eql/queues/rx-0'
kobject: 'rx-0' (ffff88809978b790): auto cleanup kobject_del
kobject: 'rx-0' (ffff88809978b790): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff8880805a4358): kobject_cleanup, parent ffff88808d5cfb48
kobject: 'tx-0' (ffff8880805a4358): auto cleanup 'remove' event
kobject: 'tx-0' (ffff8880805a4358): kobject_uevent_env
kobject: 'tx-0' (ffff8880805a4358): fill_kobj_path: path = '/devices/virtual/net/eql/queues/tx-0'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'tx-0' (ffff8880805a4358): auto cleanup kobject_del
kobject: 'tx-0' (ffff8880805a4358): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff88808d5cfb48): kobject_cleanup, parent           (null)
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'queues' (ffff88808d5cfb48): calling ktype release
kobject: 'kvm' (ffff8882194c1290): kobject_uevent_env
kobject: 'queues' (ffff88808d5cfb48): kset_release
kobject: 'kvm' (ffff8882194c1290): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'queues': free name
kobject: 'eql' (ffff888050dc1d70): kobject_uevent_env
kobject: 'eql' (ffff888050dc1d70): fill_kobj_path: path = '/devices/virtual/net/eql'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'eql' (ffff888050dc1d70): kobject_cleanup, parent           (null)
kobject: 'eql' (ffff888050dc1d70): calling ktype release
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'eql': free name
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: '0:43' (ffff88803e223750): kobject_add_internal: parent: 'bdi', set: 'devices'
kobject: '0:43' (ffff88803e223750): kobject_uevent_env
kobject: '0:43' (ffff88803e223750): fill_kobj_path: path = '/devices/virtual/bdi/0:43'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: '0:43' (ffff88803e223750): kobject_uevent_env
kobject: '0:43' (ffff88803e223750): fill_kobj_path: path = '/devices/virtual/bdi/0:43'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: '0:43' (ffff88803e223750): kobject_cleanup, parent           (null)
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: '0:43' (ffff88803e223750): calling ktype release
kobject: '0:43': free name
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=16014 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12647 comm=syz-executor.3
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a41395e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (ffff8880a40254a0): kobject_uevent_env
kobject: 'loop0' (ffff8880a40254a0): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a418e5a0): kobject_uevent_env
kobject: 'loop5' (ffff8880a418e5a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a40ecce0): kobject_uevent_env
kobject: 'loop2' (ffff8880a40ecce0): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (ffff8880a4180520): kobject_uevent_env
kobject: 'loop4' (ffff8880a4180520): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a40063e0): kobject_uevent_env
kobject: 'loop1' (ffff8880a40063e0): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (ffff8880a41395e0): kobject_uevent_env