==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801d0f36fb8 by task syz-executor3/5008

CPU: 1 PID: 5008 Comm: syz-executor3 Not tainted 4.4.111-gc2f631b #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 2f87ec87c3830a19 ffff8801d75df510 ffffffff81d0513d
 ffffea000743cd80 ffff8801d0f36fb8 0000000000000000 ffff8801d0f36fb8
 0000000000000000 ffff8801d75df548 ffffffff814fd433 ffff8801d0f36fb8
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
 [<ffffffff815f7281>] ep_remove+0x41/0x290 fs/eventpoll.c:711
 [<ffffffff815f9275>] eventpoll_release_file+0xc5/0x140 fs/eventpoll.c:935
 [<ffffffff81522d61>] eventpoll_release include/linux/eventpoll.h:61 [inline]
 [<ffffffff81522d61>] __fput+0x521/0x6d0 fs/file_table.c:199
 [<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
 [<ffffffff81007077>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81007077>] syscall_return_slowpath arch/x86/entry/common.c:347 [inline]
 [<ffffffff81007077>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff81007077>] do_fast_syscall_32+0x607/0x890 arch/x86/entry/common.c:457
 [<ffffffff837772aa>] sysenter_flags_fixed+0xd/0x17

Allocated by task 5005:
 [<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
 [<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
 [<ffffffff837772aa>] sysenter_flags_fixed+0xd/0x17

Freed by task 5005:
 [<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
 [<ffffffff8161e0ba>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8161e0ba>] 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
 [<ffffffff837772aa>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801d0f36f00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d0f36f00, ffff8801d0f37100)
The buggy address belongs to the page:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:973 lock_accessed kernel/locking/lockdep.c:973 [inline]()
WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:973 __bfs+0x2c4/0x5d0 kernel/locking/lockdep.c:1040()