==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8800b463fc38 by task syzkaller511679/3327

CPU: 0 PID: 3327 Comm: syzkaller511679 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 fcc7675e79f36e21 ffff8801d0c47870 ffffffff81d0278d
 ffffea0002d18f80 ffff8800b463fc38 0000000000000000 ffff8800b463fc38
 0000000000000000 ffff8801d0c478a8 ffffffff814fd053 ffff8800b463fc38
Call Trace:
 [<ffffffff81d0278d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0278d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd053>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fd565>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fd565>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fd6c4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239c3e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c77e>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff8377172e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff8377172e>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff8121f0a4>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f57d8>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f57d8>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f6503>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f6674>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff81522363>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81522885>] ____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
 [<ffffffff8113964d>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff8113964d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837734ea>] sysenter_flags_fixed+0xd/0x17

Allocated by task 3327:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc38d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc38d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8310>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7b46d>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7b46d>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7b46d>] binder_get_thread+0x15d/0x750 drivers/android/binder.c:4452
 [<ffffffff82c7baaa>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815f9651>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815f9651>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815f9651>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815f9651>] SyS_epoll_ctl+0x10b1/0x2040 fs/eventpoll.c:1833
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837734ea>] sysenter_flags_fixed+0xd/0x17

Freed by task 3327:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc9e2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc9e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f947c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f947c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f947c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f947c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c749d1>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c749d1>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c7550d>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c90134>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff8161cfea>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8161cfea>] compat_SyS_ioctl+0x28a/0x2540 fs/compat_ioctl.c:1544
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837734ea>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8800b463fb80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8800b463fb80, ffff8800b463fd80)
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 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3a97c0 task.stack: ffff8801da3b8000
RIP: 0010:[<ffffffff81d138cf>]  [<ffffffff81d138cf>] __rb_insert lib/rbtree.c:120 [inline]
RIP: 0010:[<ffffffff81d138cf>]  [<ffffffff81d138cf>] rb_insert_color+0x9f/0xcb0 lib/rbtree.c:420
RSP: 0018:ffff8801db307d18  EFLAGS: 00010003
RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8de0 RCX: ffffffff838a8de0
RDX: 1ffffffff07151bd RSI: ffff8801db319710 RDI: ffff8801db319c40
RBP: ffff8801db307d60 R08: ffffffff857d3748 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b660f62 R12: ffff8801d0b47df8
R13: 5028454741505f4e R14: ffff8801db319c40 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e7af973100 CR3: 00000001d0eb2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff842bdb20 ffff8801da3aa030 0000000000000000 ffff8801db307d70
 ffff8801db319c40 dffffc0000000000 0000000000000000 ffff8801db319710
 ffff8801d0b47e00 ffff8801db307db0 ffffffff81d20067 ffff8801db319c58
Call Trace:
 <IRQ> 
 [<ffffffff81d20067>] timerqueue_add+0x157/0x2a0 lib/timerqueue.c:57
 [<ffffffff812aabb8>] enqueue_hrtimer+0x168/0x450 kernel/time/hrtimer.c:890
 [<ffffffff812acc42>] __run_hrtimer kernel/time/hrtimer.c:1268 [inline]
 [<ffffffff812acc42>] __hrtimer_run_queues+0x732/0xfe0 kernel/time/hrtimer.c:1317
 [<ffffffff812aece6>] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1351
 [<ffffffff810b0c7a>] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff837747b6>] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff83773710>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737
 <EOI> 
 [<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff81220418>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220b1d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220b1d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220b1d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adaf4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 48 89 c2 48 c1 ea 03 42 80 3c 3a 00 0f 85 94 09 00 00 4c 8b 6b 08 4d 39 e5 0f 84 b0 01 00 00 4d 85 ed 74 1d 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 95 09 00 00 41 f6 45 00 01 0f 84 20 03 00 
RIP  [<ffffffff81d138cf>] __rb_insert lib/rbtree.c:120 [inline]
RIP  [<ffffffff81d138cf>] rb_insert_color+0x9f/0xcb0 lib/rbtree.c:420
 RSP <ffff8801db307d18>
---[ end trace 80f6f3f3a4e7c91b ]---