possible deadlock in aio_poll

From: syzbot
Date: Mon Sep 10 2018 - 03:41:10 EST

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Hello,

syzbot found the following crash on:

HEAD commit: f8f65382c98a Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1587e266400000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
dashboard link: https://syzkaller.appspot.com/bug?extid=5b1df0420c523b45a953
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1753bdca400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5b1df0420c523b45a953@xxxxxxxxxxxxxxxxxxxxxxxxx

8021q: adding VLAN 0 to HW filter on device team0

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
4.19.0-rc2+ #229 Not tainted
-----------------------------------------------------
syz-executor2/9399 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
00000000126506e0 (&ctx->fd_wqh){+.+.}, at: spin_lock include/linux/spinlock.h:329 [inline]
00000000126506e0 (&ctx->fd_wqh){+.+.}, at: aio_poll+0x760/0x1420 fs/aio.c:1747

and this task is already holding:
000000002bed6bf6 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:354 [inline]
000000002bed6bf6 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x738/0x1420 fs/aio.c:1746
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+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x61/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0xbc/0x710 fs/aio.c:603
percpu_ref_put_many include/linux/percpu-refcount.h:284 [inline]
percpu_ref_put include/linux/percpu-refcount.h:300 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x62c/0x820 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2847 [inline]
rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864
__do_softirq+0x30b/0xad8 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x490 arch/x86/kernel/process.c:498
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x3db/0x5b0 kernel/sched/idle.c:262
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
start_secondary+0x523/0x750 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

to a SOFTIRQ-irq-unsafe lock:
(&ctx->fd_wqh){+.+.}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x2e4/0x2180 fs/userfaultfd.c:1029
userfaultfd_read+0x1e2/0x2c0 fs/userfaultfd.c:1191
do_loop_readv_writev fs/read_write.c:700 [inline]
do_iter_read+0x4a3/0x650 fs/read_write.c:924
vfs_readv+0x175/0x1c0 fs/read_write.c:986
do_readv+0x11a/0x310 fs/read_write.c:1019
__do_sys_readv fs/read_write.c:1106 [inline]
__se_sys_readv fs/read_write.c:1103 [inline]
__x64_sys_readv+0x75/0xb0 fs/read_write.c:1103
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&ctx->fd_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-executor2/9399:
#0: 000000002bed6bf6 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:354 [inline]
#0: 000000002bed6bf6 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll+0x738/0x1420 fs/aio.c:1746

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&(&ctx->ctx_lock)->rlock){..-.} ops: 387 {
IN-SOFTIRQ-W at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x61/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0xbc/0x710 fs/aio.c:603
percpu_ref_put_many include/linux/percpu-refcount.h:284 [inline]
percpu_ref_put include/linux/percpu-refcount.h:300 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x62c/0x820 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2847 [inline]
rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864
__do_softirq+0x30b/0xad8 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x490 arch/x86/kernel/process.c:498
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x3db/0x5b0 kernel/sched/idle.c:262
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
start_secondary+0x523/0x750 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242
INITIAL USE at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x61/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0xbc/0x710 fs/aio.c:603
percpu_ref_put_many include/linux/percpu-refcount.h:284 [inline]
percpu_ref_put include/linux/percpu-refcount.h:300 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x62c/0x820 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2847 [inline]
rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864
__do_softirq+0x30b/0xad8 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x490 arch/x86/kernel/process.c:498
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x3db/0x5b0 kernel/sched/idle.c:262
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
start_secondary+0x523/0x750 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242
}
... key at: [<ffffffff8b3dc960>] __key.50120+0x0/0x40
... acquired at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x760/0x1420 fs/aio.c:1747
io_submit_one+0xab8/0x1090 fs/aio.c:1850
__do_sys_io_submit fs/aio.c:1916 [inline]
__se_sys_io_submit fs/aio.c:1887 [inline]
__x64_sys_io_submit+0x1b9/0x5d0 fs/aio.c:1887
do_syscall_64+0x1b9/0x820 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->fd_wqh){+.+.} ops: 2209 {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x2e4/0x2180 fs/userfaultfd.c:1029
userfaultfd_read+0x1e2/0x2c0 fs/userfaultfd.c:1191
do_loop_readv_writev fs/read_write.c:700 [inline]
do_iter_read+0x4a3/0x650 fs/read_write.c:924
vfs_readv+0x175/0x1c0 fs/read_write.c:986
do_readv+0x11a/0x310 fs/read_write.c:1019
__do_sys_readv fs/read_write.c:1106 [inline]
__se_sys_readv fs/read_write.c:1103 [inline]
__x64_sys_readv+0x75/0xb0 fs/read_write.c:1103
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
SOFTIRQ-ON-W at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x2e4/0x2180 fs/userfaultfd.c:1029
userfaultfd_read+0x1e2/0x2c0 fs/userfaultfd.c:1191
do_loop_readv_writev fs/read_write.c:700 [inline]
do_iter_read+0x4a3/0x650 fs/read_write.c:924
vfs_readv+0x175/0x1c0 fs/read_write.c:986
do_readv+0x11a/0x310 fs/read_write.c:1019
__do_sys_readv fs/read_write.c:1106 [inline]
__se_sys_readv fs/read_write.c:1103 [inline]
__x64_sys_readv+0x75/0xb0 fs/read_write.c:1103
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read+0x2e4/0x2180 fs/userfaultfd.c:1029
userfaultfd_read+0x1e2/0x2c0 fs/userfaultfd.c:1191
do_loop_readv_writev fs/read_write.c:700 [inline]
do_iter_read+0x4a3/0x650 fs/read_write.c:924
vfs_readv+0x175/0x1c0 fs/read_write.c:986
do_readv+0x11a/0x310 fs/read_write.c:1019
__do_sys_readv fs/read_write.c:1106 [inline]
__se_sys_readv fs/read_write.c:1103 [inline]
__x64_sys_readv+0x75/0xb0 fs/read_write.c:1103
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8b3dc6e0>] __key.43670+0x0/0x40
... acquired at:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x760/0x1420 fs/aio.c:1747
io_submit_one+0xab8/0x1090 fs/aio.c:1850
__do_sys_io_submit fs/aio.c:1916 [inline]
__se_sys_io_submit fs/aio.c:1887 [inline]
__x64_sys_io_submit+0x1b9/0x5d0 fs/aio.c:1887
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

stack backtrace:
CPU: 0 PID: 9399 Comm: syz-executor2 Not tainted 4.19.0-rc2+ #229
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+0x1c4/0x2b4 lib/dump_stack.c:113
print_bad_irq_dependency kernel/locking/lockdep.c:1569 [inline]
check_usage.cold.58+0x6d5/0xad1 kernel/locking/lockdep.c:1601
check_irq_usage kernel/locking/lockdep.c:1657 [inline]
check_prev_add_irq kernel/locking/lockdep_states.h:8 [inline]
check_prev_add kernel/locking/lockdep.c:1867 [inline]
check_prevs_add kernel/locking/lockdep.c:1975 [inline]
validate_chain kernel/locking/lockdep.c:2416 [inline]
__lock_acquire+0x2400/0x4ec0 kernel/locking/lockdep.c:3412
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll+0x760/0x1420 fs/aio.c:1747
io_submit_one+0xab8/0x1090 fs/aio.c:1850
__do_sys_io_submit fs/aio.c:1916 [inline]
__se_sys_io_submit fs/aio.c:1887 [inline]
__x64_sys_io_submit+0x1b9/0x5d0 fs/aio.c:1887
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa4bd11bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007fa4bd11c6d4 RCX: 0000000000457099
RDX: 0000000020000b00 RSI: 0000000000000001 RDI: 00007fa4bd13e000
RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cd990 R14: 00000000004c40a7 R15: 0000000000000002
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000fd2f09a6): kobject_uevent_env
kobject: 'loop1' (00000000fd2f09a6): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop6' (00000000790743e9): kobject_uevent_env
kobject: 'loop6' (00000000790743e9): fill_kobj_path: path = '/devices/virtual/block/loop6'
kobject: 'loop7' (00000000b52cfd8a): kobject_uevent_env
kobject: 'loop7' (00000000b52cfd8a): fill_kobj_path: path = '/devices/virtual/block/loop7'
kobject: 'loop2' (000000002d051810): kobject_uevent_env
kobject: 'loop2' (000000002d051810): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (0000000044e01f3d): kobject_uevent_env
kobject: 'loop5' (0000000044e01f3d): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop4' (000000003f6c580a): kobject_uevent_env
kobject: 'loop4' (000000003f6c580a): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (000000001d0a0601): kobject_uevent_env
kobject: 'loop3' (000000001d0a0601): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop0' (000000005501af28): kobject_uevent_env
kobject: 'loop0' (000000005501af28): fill_kobj_path: path = '/devices/virtual/block/loop0'

---
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