binder: 7106:7136 BC_INCREFS_DONE u0000000000000001 no match
binder: 7106:7136 BC_CLEAR_DEATH_NOTIFICATION invalid ref 2
binder: 7106:7136 transaction failed 29189/-22, size 0-0 line 3014
binder: undelivered TRANSACTION_ERROR: 29189
INFO: task syz-executor.5:2152 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D ffff8800a7befa78 25824  2152      1 0x00000004
 ffff8800a7befa78 ffff8800b7800000 857c90a1f9a7e1a9 ffff8800b7800000
 0000000000000000 ffff8800b7800800 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8800b7805f00 ffff8800b7800000 ffffed0014f7d001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81d46575>] lo_ioctl+0x85/0x1a70 drivers/block/loop.c:1416
 [<ffffffff81a7ae89>] __blkdev_driver_ioctl block/ioctl.c:288 [inline]
 [<ffffffff81a7ae89>] blkdev_ioctl+0xed9/0x1940 block/ioctl.c:584
 [<ffffffff8155036e>] block_ioctl+0xde/0x120 fs/block_dev.c:1625
 [<ffffffff814d23f7>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff814d23f7>] file_ioctl fs/ioctl.c:470 [inline]
 [<ffffffff814d23f7>] do_vfs_ioctl+0x6e7/0xfa0 fs/ioctl.c:605
 [<ffffffff814d2d3f>] SYSC_ioctl fs/ioctl.c:622 [inline]
 [<ffffffff814d2d3f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by syz-executor.5/2152:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<ffffffff81d46575>] lo_ioctl+0x85/0x1a70 drivers/block/loop.c:1416
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6c5f00 task.stack: ffff8800001c8000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001cfc88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001cfcb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09ad36a000 CR3: 00000001d5c6d000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001cfcd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001cfd30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.174+ #4
task: ffff8801da6897c0 task.stack: ffff8801da698000
RIP: 0010:[<ffffffff811f88c3>]  [<ffffffff811f88c3>] trace_hardirqs_off_caller+0x133/0x290 kernel/locking/lockdep.c:2647
RSP: 0018:ffff8801da69fcd0  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: ffff8801da6897c0 RCX: 0000000000000000
RDX: 1ffff1003b4d140a RSI: 0000000000000000 RDI: ffff8801da68a040
RBP: ffff8801da69fce8 R08: ffff8801da6897c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82717e89
R13: ffff8801da6897c0 R14: ffff8801db71e880 R15: 000000000001e880
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f466ae7a000 CR3: 00000001d71b1000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffff8801db71e880 ffff8801db71e880 ffff8801da69fcf8
 ffffffff811f8a2d ffff8801da69fd18 ffffffff82717e89 ffff8801da69fd18
 ffff8801db71e880 ffff8801da69fda0 ffffffff82707c11 ffff8801db7198c0
Call Trace:
 [<ffffffff811f8a2d>] trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2657
 [<ffffffff82717e89>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 [<ffffffff82717e89>] _raw_spin_lock_irq+0x19/0x60 kernel/locking/spinlock.c:167
 [<ffffffff82707c11>] __schedule+0x1c1/0x1ee0 kernel/sched/core.c:3276
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff811ebd25>] cpu_idle_loop kernel/sched/idle.c:279 [inline]
 [<ffffffff811ebd25>] cpu_startup_entry+0x755/0x810 kernel/sched/idle.c:301
 [<ffffffff8108719d>] start_secondary+0x31d/0x410 arch/x86/kernel/smpboot.c:245
Code: 00 00 8b 83 90 08 00 00 85 c0 0f 84 a4 00 00 00 48 8d bb 80 08 00 00 48 b8 00 00 00 00 00 fc ff df c7 83 90 08 00 00 00 00 00 00 <48> 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 27 01 00 00 48 8d bb 70