==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801c519d738 by task syz-executor4/6879

CPU: 0 PID: 6879 Comm: syz-executor4 Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 d8eb6f8db50316bf ffff8801c500f650 ffffffff81d0394d
 ffffea0007146700 ffff8801c519d738 0000000000000000 ffff8801c519d738
 0000000000000000 ffff8801c500f688 ffffffff814fe1d3 ffff8801c519d738
Call Trace:
 [<ffffffff81d0394d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0394d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fe1d3>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fe6e5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fe6e5>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fe844>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff8123ac7e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
binder: BINDER_SET_CONTEXT_MGR already set
binder: 6887:6893 ioctl 40046207 0 returned -16
 [<ffffffff8123d7be>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff83773ace>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff83773ace>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff812200e4>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f6988>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f6988>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f76b3>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f7824>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff815234e3>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81523a05>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b9d4>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f7a>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f7a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
 [<ffffffff81139418>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8115c872>] get_signal+0x4f2/0x1550 kernel/signal.c:2317
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:247
 [<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff83774069>] int_ret_from_sys_call+0x25/0xa3

Allocated by task 6878:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd243>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd50d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd50d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f9490>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7c77d>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7c77d>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7c77d>] binder_get_thread+0x15d/0x750 drivers/android/binder.c:4452
 [<ffffffff82c7cdba>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815fa801>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815fa801>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815fa801>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815fa801>] SyS_epoll_ctl+0x10b1/0x2040 fs/eventpoll.c:1833
 [<ffffffff83773edf>] entry_SYSCALL_64_fastpath+0x1c/0x98

Freed by task 6878:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd243>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdb62>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdb62>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fa5fc>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fa5fc>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fa5fc>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fa5fc>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c75ce1>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c75ce1>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c7681d>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c91444>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff81559a6a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff81559a6a>] do_vfs_ioctl+0x7aa/0xee0 fs/ioctl.c:607
 [<ffffffff8155a22f>] SYSC_ioctl fs/ioctl.c:622 [inline]
 [<ffffffff8155a22f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
 [<ffffffff83773edf>] entry_SYSCALL_64_fastpath+0x1c/0x98

The buggy address belongs to the object at ffff8801c519d680
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801c519d680, ffff8801c519d880)
The buggy address belongs to the page:
PANIC: double fault, error_code: 0x0
CPU: 0 PID: 6879 Comm: syz-executor4 Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b8963000 task.stack: ffff8801c5008000
RIP: 0010:[<ffffffff814908da>]  [<ffffffff814908da>] dump_page_badflags+0x1a/0x250 mm/debug.c:84
RSP: 0018:ffff880100000000  EFLAGS: 00010086
RAX: ffff8800b8963000 RBX: ffffea0007146700 RCX: ffffffff81490a40
RDX: 0000000000000000 RSI: ffffffff838a8e60 RDI: ffffea0007146700
RBP: ffff880100000030 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: fffffbfff0ad7e2e R12: 0000000000000000
R13: ffffffff838a8e60 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f050a2ab700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffff8 CR3: 00000000abc80000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:

Call Trace:
 <UNK> 
Code: df 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec 08 <e8> 91 04 ed ff 48 8d 7b 10 48 b8 00 00 00 00 00 fc ff df 48 89