IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.0.0-rc3+ #48 Not tainted
-----------------------------------------------------
syz-executor5/8205 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
0000000011783c53 (&ctx->fd_wqh){....}, at: spin_lock include/linux/spinlock.h:329 [inline]
0000000011783c53 (&ctx->fd_wqh){....}, at: aio_poll+0x7b9/0x14e0 fs/aio.c:1772
and this task is already holding:
00000000b36c0b41 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:354 [inline]
00000000b36c0b41 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x790/0x14e0 fs/aio.c:1771
which would create a new lock dependency:
(&(&ctx->ctx_lock)->rlock){..-.} -> (&ctx->fd_wqh){....}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&(&ctx->ctx_lock)->rlock){..-.}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0xa7/0x6e0 fs/aio.c:610
percpu_ref_put_many include/linux/percpu-refcount.h:285 [inline]
percpu_ref_put include/linux/percpu-refcount.h:301 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x50c/0x6b0 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:240 [inline]
rcu_do_batch kernel/rcu/tree.c:2452 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline]
rcu_process_callbacks+0xc4a/0x1680 kernel/rcu/tree.c:2754
__do_softirq+0x30b/0xb11 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184
__debug_object_init+0x1c0/0x12d0 lib/debugobjects.c:418
debug_object_init lib/debugobjects.c:431 [inline]
debug_object_activate+0x348/0x550 lib/debugobjects.c:512
debug_rcu_head_queue kernel/rcu/rcu.h:194 [inline]
__call_rcu.constprop.0+0x9f/0x920 kernel/rcu/tree.c:2852
call_rcu+0xb/0x10 kernel/rcu/tree.c:2947
update_memcg_params mm/slab_common.c:201 [inline]
memcg_update_all_caches+0x82/0x130 mm/slab_common.c:212
memcg_alloc_cache_id mm/memcontrol.c:2444 [inline]
memcg_online_kmem mm/memcontrol.c:3072 [inline]
mem_cgroup_css_alloc+0x144c/0x1a60 mm/memcontrol.c:4518
css_create kernel/cgroup/cgroup.c:4851 [inline]
cgroup_apply_control_enable+0x54d/0xf20 kernel/cgroup/cgroup.c:2976
cgroup_mkdir+0x878/0x1270 kernel/cgroup/cgroup.c:5069
kernfs_iop_mkdir+0x150/0x1e0 fs/kernfs/dir.c:1122
vfs_mkdir+0x433/0x690 fs/namei.c:3816
do_mkdirat+0x271/0x2f0 fs/namei.c:3839
__do_sys_mkdir fs/namei.c:3855 [inline]
__se_sys_mkdir fs/namei.c:3853 [inline]
__x64_sys_mkdir+0x5c/0x80 fs/namei.c:3853
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
to a SOFTIRQ-irq-unsafe lock:
(&ctx->fault_pending_wqh){+.+.}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x609/0x8c0 fs/userfaultfd.c:916
__fput+0x3c5/0xb10 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x1f4/0x2b0 kernel/task_work.c:113
get_signal+0x168d/0x19b0 kernel/signal.c:2347
do_signal+0x91/0x1ea0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&(&ctx->ctx_lock)->rlock --> &ctx->fd_wqh --> &ctx->fault_pending_wqh
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ctx->fault_pending_wqh);
local_irq_disable();
lock(&(&ctx->ctx_lock)->rlock);
lock(&ctx->fd_wqh);
<Interrupt>
lock(&(&ctx->ctx_lock)->rlock);
*** DEADLOCK ***
1 lock held by syz-executor5/8205:
#0: 00000000b36c0b41 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:354 [inline]
#0: 00000000b36c0b41 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x790/0x14e0 fs/aio.c:1771
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&(&ctx->ctx_lock)->rlock){..-.} {
IN-SOFTIRQ-W at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0xa7/0x6e0 fs/aio.c:610
percpu_ref_put_many include/linux/percpu-refcount.h:285 [inline]
percpu_ref_put include/linux/percpu-refcount.h:301 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x50c/0x6b0 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:240 [inline]
rcu_do_batch kernel/rcu/tree.c:2452 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline]
rcu_process_callbacks+0xc4a/0x1680 kernel/rcu/tree.c:2754
__do_softirq+0x30b/0xb11 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184
__debug_object_init+0x1c0/0x12d0 lib/debugobjects.c:418
debug_object_init lib/debugobjects.c:431 [inline]
debug_object_activate+0x348/0x550 lib/debugobjects.c:512
debug_rcu_head_queue kernel/rcu/rcu.h:194 [inline]
__call_rcu.constprop.0+0x9f/0x920 kernel/rcu/tree.c:2852
call_rcu+0xb/0x10 kernel/rcu/tree.c:2947
update_memcg_params mm/slab_common.c:201 [inline]
memcg_update_all_caches+0x82/0x130 mm/slab_common.c:212
memcg_alloc_cache_id mm/memcontrol.c:2444 [inline]
memcg_online_kmem mm/memcontrol.c:3072 [inline]
mem_cgroup_css_alloc+0x144c/0x1a60 mm/memcontrol.c:4518
css_create kernel/cgroup/cgroup.c:4851 [inline]
cgroup_apply_control_enable+0x54d/0xf20 kernel/cgroup/cgroup.c:2976
cgroup_mkdir+0x878/0x1270 kernel/cgroup/cgroup.c:5069
kernfs_iop_mkdir+0x150/0x1e0 fs/kernfs/dir.c:1122
vfs_mkdir+0x433/0x690 fs/namei.c:3816
do_mkdirat+0x271/0x2f0 fs/namei.c:3839
__do_sys_mkdir fs/namei.c:3855 [inline]
__se_sys_mkdir fs/namei.c:3853 [inline]
__x64_sys_mkdir+0x5c/0x80 fs/namei.c:3853
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
aio_poll+0x790/0x14e0 fs/aio.c:1771
__io_submit_one fs/aio.c:1875 [inline]
io_submit_one+0xc39/0x1050 fs/aio.c:1908
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit fs/aio.c:1923 [inline]
__x64_sys_io_submit+0x1c4/0x5d0 fs/aio.c:1923
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8b58d0a0>] __key.51949+0x0/0x40
... acquired at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x7b9/0x14e0 fs/aio.c:1772
__io_submit_one fs/aio.c:1875 [inline]
io_submit_one+0xc39/0x1050 fs/aio.c:1908
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit fs/aio.c:1923 [inline]
__x64_sys_io_submit+0x1c4/0x5d0 fs/aio.c:1923
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&ctx->fault_pending_wqh){+.+.} {
HARDIRQ-ON-W at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x609/0x8c0 fs/userfaultfd.c:916
__fput+0x3c5/0xb10 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x1f4/0x2b0 kernel/task_work.c:113
get_signal+0x168d/0x19b0 kernel/signal.c:2347
do_signal+0x91/0x1ea0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
SOFTIRQ-ON-W at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x609/0x8c0 fs/userfaultfd.c:916
__fput+0x3c5/0xb10 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x1f4/0x2b0 kernel/task_work.c:113
get_signal+0x168d/0x19b0 kernel/signal.c:2347
do_signal+0x91/0x1ea0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x690/0x2060 fs/userfaultfd.c:1040
userfaultfd_read+0x1e0/0x2c0 fs/userfaultfd.c:1198
__vfs_read+0x116/0xb20 fs/read_write.c:416
vfs_read+0x194/0x3e0 fs/read_write.c:452
ksys_read+0x105/0x260 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8b58cee0>] __key.44850+0x0/0x40
... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x690/0x2060 fs/userfaultfd.c:1040
userfaultfd_read+0x1e0/0x2c0 fs/userfaultfd.c:1198
__vfs_read+0x116/0xb20 fs/read_write.c:416
vfs_read+0x194/0x3e0 fs/read_write.c:452
ksys_read+0x105/0x260 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> (&ctx->fd_wqh){....} {
INITIAL USE at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
userfaultfd_ctx_read+0x25e/0x2060 fs/userfaultfd.c:1036
userfaultfd_read+0x1e0/0x2c0 fs/userfaultfd.c:1198
__vfs_read+0x116/0xb20 fs/read_write.c:416
vfs_read+0x194/0x3e0 fs/read_write.c:452
ksys_read+0x105/0x260 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8b58ce20>] __key.44853+0x0/0x40
... acquired at:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x7b9/0x14e0 fs/aio.c:1772
__io_submit_one fs/aio.c:1875 [inline]
io_submit_one+0xc39/0x1050 fs/aio.c:1908
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit fs/aio.c:1923 [inline]
__x64_sys_io_submit+0x1c4/0x5d0 fs/aio.c:1923
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
stack backtrace:
CPU: 1 PID: 8205 Comm: syz-executor5 Not tainted 5.0.0-rc3+ #48
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
print_bad_irq_dependency kernel/locking/lockdep.c:1573 [inline]
check_usage.cold+0x5e2/0x917 kernel/locking/lockdep.c:1605
check_irq_usage kernel/locking/lockdep.c:1661 [inline]
check_prev_add_irq kernel/locking/lockdep_states.h:8 [inline]
check_prev_add kernel/locking/lockdep.c:1871 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2350 [inline]
__lock_acquire+0x2169/0x4a30 kernel/locking/lockdep.c:3338
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x7b9/0x14e0 fs/aio.c:1772
__io_submit_one fs/aio.c:1875 [inline]
io_submit_one+0xc39/0x1050 fs/aio.c:1908
__do_sys_io_submit fs/aio.c:1953 [inline]
__se_sys_io_submit fs/aio.c:1923 [inline]
__x64_sys_io_submit+0x1c4/0x5d0 fs/aio.c:1923
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458099
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f27be669c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099
RDX: 0000000020000600 RSI: 0000000000000001 RDI: 00007f27be68c000
RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f27be66a6d4
R13: 00000000004bf2cb R14: 00000000004d0af8 R15: 00000000ffffffff
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (0000000090516c5d): kobject_uevent_env
kobject: 'loop1' (0000000090516c5d): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (000000002d56a391): kobject_uevent_env
kobject: 'loop2' (000000002d56a391): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000045eb9d2d): kobject_uevent_env
kobject: 'loop0' (0000000045eb9d2d): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (0000000086be7a8c): kobject_uevent_env
kobject: 'loop4' (0000000086be7a8c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (00000000c5d1ba62): kobject_uevent_env
kobject: 'loop3' (00000000c5d1ba62): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (0000000090516c5d): kobject_uevent_env
kobject: 'loop1' (0000000090516c5d): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (000000002d56a391): kobject_uevent_env
kobject: 'loop2' (000000002d56a391): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (00000000c5d1ba62): kobject_uevent_env
kobject: 'loop3' (00000000c5d1ba62): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (0000000045eb9d2d): kobject_uevent_env
kobject: 'loop0' (0000000045eb9d2d): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (0000000086be7a8c): kobject_uevent_env
kobject: 'loop4' (0000000086be7a8c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (0000000090516c5d): kobject_uevent_env
kobject: 'loop1' (0000000090516c5d): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000045eb9d2d): kobject_uevent_env
kobject: 'loop0' (0000000045eb9d2d): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (000000002d56a391): kobject_uevent_env
kobject: 'loop2' (000000002d56a391): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (00000000c5d1ba62): kobject_uevent_env
kobject: 'loop3' (00000000c5d1ba62): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (0000000086be7a8c): kobject_uevent_env
kobject: 'loop4' (0000000086be7a8c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (000000002d56a391): kobject_uevent_env
kobject: 'loop2' (000000002d56a391): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000045eb9d2d): kobject_uevent_env
kobject: 'loop0' (0000000045eb9d2d): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (0000000090516c5d): kobject_uevent_env
kobject: 'loop1' (0000000090516c5d): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (0000000086be7a8c): kobject_uevent_env
kobject: 'loop4' (0000000086be7a8c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (00000000c5d1ba62): kobject_uevent_env
kobject: 'loop3' (00000000c5d1ba62): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (0000000045eb9d2d): kobject_uevent_env
kobject: 'loop0' (0000000045eb9d2d): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (000000002d56a391): kobject_uevent_env
kobject: 'loop2' (000000002d56a391): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (00000000c5d1ba62): kobject_uevent_env
kobject: 'loop3' (00000000c5d1ba62): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (0000000090516c5d): kobject_uevent_env
kobject: 'loop1' (0000000090516c5d): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (0000000086be7a8c): kobject_uevent_env
kobject: 'loop4' (0000000086be7a8c): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop5' (0000000020ed5d29): kobject_uevent_env
kobject: 'loop5' (0000000020ed5d29): fill_kobj_path: path = '/devices/virtual/block/loop5'