==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801d055bc38 by task syz-executor3/5164

CPU: 0 PID: 5164 Comm: syz-executor3 Not tainted 4.4.111-gc2f631b #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 4c128a1c0926c4eb ffff8801cee6f580 ffffffff81d0513d
 ffffea0007415680 ffff8801d055bc38 0000000000000000 ffff8801d055bc38
 0000000000000000 ffff8801cee6f5b8 ffffffff814fd433 ffff8801d055bc38
Call Trace:
 [<ffffffff81d0513d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0513d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd433>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fd945>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fd945>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fdaa4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239cae>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c7ee>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff8377550e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff8377550e>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff8121f194>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f6838>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f6838>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f7563>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f76d4>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff81522a73>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81522f95>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bae4>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132eb1>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132eb1>] do_exit+0x871/0x2a20 kernel/exit.c:755
 [<ffffffff81139328>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8115c825>] get_signal+0x565/0x1660 kernel/signal.c:2317
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff81003602>] exit_to_usermode_loop+0x122/0x170 arch/x86/entry/common.c:247
 [<ffffffff81006545>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006545>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff83775a9d>] int_ret_from_sys_call+0x25/0xa3

Allocated by task 5156:
 [<ffffffff81035d26>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc4a3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc76d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc76d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f86e0>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7ecf1>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7ecf1>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7ecf1>] binder_get_thread+0x181/0x7a0 drivers/android/binder.c:4452
 [<ffffffff82c7f35a>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815fa6c1>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815fa6c1>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815fa6c1>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815fa6c1>] SyS_epoll_ctl+0x10b1/0x2050 fs/eventpoll.c:1833
 [<ffffffff83775919>] entry_SYSCALL_64_fastpath+0x16/0x92

Freed by task 5156:
 [<ffffffff81035d26>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc4a3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fcdc2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fcdc2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f984c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f984c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f984c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f984c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c78241>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c78241>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c78d7d>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c939e4>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff815594aa>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815594aa>] do_vfs_ioctl+0x7aa/0xee0 fs/ioctl.c:607
 [<ffffffff81559c6f>] SYSC_ioctl fs/ioctl.c:622 [inline]
 [<ffffffff81559c6f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
 [<ffffffff83775919>] entry_SYSCALL_64_fastpath+0x16/0x92

The buggy address belongs to the object at ffff8801d055bb80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d055bb80, ffff8801d055bd80)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.111-gc2f631b #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3a97c0 task.stack: ffff8801da3b8000
RIP: 0010:[<ffffffff81d670f6>]  [<ffffffff81d670f6>] lookup_object lib/debugobjects.c:120 [inline]
RIP: 0010:[<ffffffff81d670f6>]  [<ffffffff81d670f6>] debug_object_deactivate+0x1a6/0x3c0 lib/debugobjects.c:465
RSP: 0018:ffff8801db307d10  EFLAGS: 00010003
RAX: 0000000000000096 RBX: 4f5f4755425f4d56 RCX: ffff8801da38fb30
RDX: 09ebe8eaa84be9ad RSI: ffffffff842c2560 RDI: 4f5f4755425f4d6e
RBP: ffff8801db307dd8 R08: 1ffff10039c852a4 R09: ffffffff85108e30
R10: 0000000000000001 R11: 1ffff1003b660f68 R12: 1ffff1003b660fa6
R13: 0000000000000003 R14: dffffc0000000000 R15: ffffffff8585a808
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000041b580 CR3: 00000000b4d46000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffffffff842c2560 ffff8801da38fb30 0000000000000096
 0000000041b58ab3 ffffffff83fcc981 ffffffff81d66f50 ffffffff812a1a72
 ffff880100000000 ffff880100000000 0000000000000046 ffff8801da3a97c0
Call Trace:
 <IRQ> 
 [<ffffffff812a1ca6>] debug_timer_deactivate kernel/time/timer.c:618 [inline]
 [<ffffffff812a1ca6>] debug_deactivate kernel/time/timer.c:670 [inline]
 [<ffffffff812a1ca6>] detach_timer kernel/time/timer.c:716 [inline]
 [<ffffffff812a1ca6>] detach_expired_timer kernel/time/timer.c:727 [inline]
 [<ffffffff812a1ca6>] __run_timers kernel/time/timer.c:1246 [inline]
 [<ffffffff812a1ca6>] run_timer_softirq+0x336/0xbb0 kernel/time/timer.c:1437
 [<ffffffff83778e3d>] __do_softirq+0x24d/0xa59 kernel/softirq.c:273
 [<ffffffff8113da09>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113da09>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff8377857b>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff8377857b>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff837774d0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:725
 <EOI> 
 [<ffffffff81027e15>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027e15>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102938a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff81220508>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220c15>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220c15>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220c15>] cpu_startup_entry+0x605/0x820 kernel/sched/idle.c:301
 [<ffffffff810ad7a4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: eb 1a 48 89 da 48 c1 ea 03 42 80 3c 32 00 0f 85 86 01 00 00 48 8b 1b 48 85 db 74 7a 48 8d 7b 18 41 83 c5 01 48 89 fa 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3c 01 00 00 48 3b 4b 18 75 c6 48 8d 7b 10 
RIP  [<ffffffff81d670f6>] lookup_object lib/debugobjects.c:120 [inline]
RIP  [<ffffffff81d670f6>] debug_object_deactivate+0x1a6/0x3c0 lib/debugobjects.c:465
 RSP <ffff8801db307d10>
---[ end trace a2fd7433ca8b7880 ]---