random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available)
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801d1096838 by task syzkaller278471/3319

CPU: 0 PID: 3319 Comm: syzkaller278471 Not tainted 4.4.112-gca0ebb4 #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 a4e413801219c40e ffff8801d0bcf850 ffffffff81d056fd
 ffffea0007442580 ffff8801d1096838 0000000000000000 ffff8801d1096838
 0000000000000000 ffff8801d0bcf888 ffffffff814fd953 ffff8801d1096838
Call Trace:
 [<ffffffff81d056fd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d056fd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd953>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fde65>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fde65>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fdfc4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239c7e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c7be>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff83775fce>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff83775fce>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff8121f164>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f6d58>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f6d58>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f7a83>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f7bf4>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff81522f93>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff815234b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bb54>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f21>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f21>] do_exit+0x871/0x2a20 kernel/exit.c:755
 [<ffffffff81139398>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff811395cd>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff811395cd>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83777d6a>] sysenter_flags_fixed+0xd/0x17

Allocated by task 3319:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fcc8d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fcc8d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8c00>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7f541>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7f541>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7f541>] binder_get_thread+0x181/0x7a0 drivers/android/binder.c:4452
 [<ffffffff82c7fbaa>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815fabe1>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815fabe1>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815fabe1>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815fabe1>] SyS_epoll_ctl+0x10b1/0x2050 fs/eventpoll.c:1833
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83777d6a>] sysenter_flags_fixed+0xd/0x17

Freed by task 3319:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd2e2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd2e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f9d6c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f9d6c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f9d6c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f9d6c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c78a91>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c78a91>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c795cd>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c94234>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff8161e61a>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8161e61a>] compat_SyS_ioctl+0x28a/0x2540 fs/compat_ioctl.c:1544
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83777d6a>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801d1096780
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d1096780, ffff8801d1096980)
The buggy address belongs to the page:
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: [<          (null)>]           (null)
PGD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.112-gca0ebb4 #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3a97c0 task.stack: ffff8801da3b8000
RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
RSP: 0018:ffff8801db307df0  EFLAGS: 00010006
RAX: ffff8801da3a97c0 RBX: ffff8801d0827df8 RCX: ffffffff812ac970
RDX: 0000000000010000 RSI: ffffffff839fdb20 RDI: ffff8801d0827df8
RBP: ffff8801db307ee0 R08: 1ffff1003ab71f92 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b660f6a R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801db319640
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001d13de000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff812ac976 ffff88021fffd057 ffff88021fffd05b ffff88021fffd04f
 1ffff1003b660fcb ffff8801db3196a0 ffffed003b660fca ffff8801db319700
 0303fc0000000001 ffff8801db319678 ffffed003b6632d4 ffff8801db319718
Call Trace:
 <IRQ> 
 [<ffffffff812aee46>] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1351
 [<ffffffff810b0dda>] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff83779036>] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff83777f90>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:725
 <EOI> 
 [<ffffffff81027ee5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027ee5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff812204d8>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220be5>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220be5>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220be5>] cpu_startup_entry+0x605/0x820 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code:  Bad RIP value.
RIP  [<          (null)>]           (null)
 RSP <ffff8801db307df0>
CR2: 0000000000000000
---[ end trace 64e108ee1daa6b4b ]---