binder: 4577:4578 ioctl c0306201 200005c0 returned -22
Dev loop0: unable to read RDB block 8
 loop0: unable to read partition table
loop0: partition table beyond EOD, truncated
loop_reread_partitions: partition scan of loop0 () failed (rc=-5)
INFO: task syz-executor1:4599 blocked for more than 120 seconds.
      Not tainted 4.9.99-gc462abb #20
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28568  4599  24080 0x00000004
 ffff8801cb241800 ffff8801bf177480 ffff8801cfde8fc0 ffff8801bfcb4800
 ffff8801db221b98 ffff8801852f7b48 ffffffff839e377d ffff8801cb2420c8
 ffffed0039648418 ffff8801cb241800 00fffc0000000000 ffff8801db222468
Call Trace:
 [<ffffffff839e4d7f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839e5703>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839e9b86>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839e9b86>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff825c9e26>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1920
 [<ffffffff815b03fc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b03fc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b03fc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b147f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b147f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423bc0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3771:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2822>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211cc32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor1/4599:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c9d1a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1906
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<ffffffff825c9e26>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1920
2 locks held by syz-executor0/4587:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c773b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81e5358e>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
2 locks held by blkid/4608:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162e91c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c27db>] lo_open+0x1b/0xa0 drivers/block/loop.c:1555
2 locks held by blkid/4609:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162e91c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c27db>] lo_open+0x1b/0xa0 drivers/block/loop.c:1555

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.99-gc462abb #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84a7d08 ffffffff81eb0f09 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b7da0 ffff8801d84a7d40
 ffffffff81ebc207 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0f09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0f09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc207>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc19a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.99-gc462abb #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84629800 task.stack: ffffffff84600000
RIP: 0010:[<ffffffff81f18966>] 
c [<ffffffff81f18966>] check_preemption_disabled+0x36/0x170 lib/smp_processor_id.c:15
RSP: 0018:ffff8801db207f20  EFLAGS: 00000093
RAX: ffffffff84629800 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff81f18966 RDI: ffffffff83e2cde0
RBP: ffff8801db207f50 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83e2cde0
R13: ffffffff83e2cda0 R14: ffffffff84c5df08 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001a50978 CR3: 00000001cb635000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff846deea0
c 000000000001ce80
c 0000000000000000
c 0000000000000000
c
 ffffffff84c5df08
c 0000000000000000
c ffff8801db207f60
c ffffffff81f18abc
c
 ffff8801db207f80
c ffffffff812c84f3
c 0000000000000046
c 000000000001ce80
c
Call Trace:
 <IRQ> 
d [<ffffffff81f18abc>] debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:56
 [<ffffffff812c84f3>] tick_check_oneshot_broadcast_this_cpu+0x13/0xe0 kernel/time/tick-broadcast.c:581
 [<ffffffff812cc870>] tick_irq_enter+0x20/0x220 kernel/time/tick-sched.c:1164
 [<ffffffff81148ed3>] irq_enter+0xb3/0xd0 kernel/softirq.c:345
 [<ffffffff839f8d7a>] smp_reschedule_interrupt+0xa/0x90 arch/x86/kernel/smp.c:267
 [<ffffffff839f6950>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f3286>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f28c5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f28c5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f36e5>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220e65>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220e65>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220e65>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff839e054c>] rest_init+0x183/0x189 init/main.c:409
 [<ffffffff84c97943>] start_kernel+0x67e/0x6b2 init/main.c:664
 [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
c89 
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c<e8> 
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c