binder: 30499:30503 transaction failed 29189/-3, size 0-0 line 2903
binder_alloc: 30499: binder_alloc_buf, no vma
binder: 30499:30503 transaction failed 29189/-3, size 24-0 line 2903
==================================================================
BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x5b7/0x980 include/trace/events/lock.h:13
Read of size 8 at addr ffff8801cf278848 by task syz-executor6/30499

CPU: 0 PID: 30499 Comm: syz-executor6 Not tainted 4.15.0-rc6+ #247
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 perf_trace_lock_acquire+0x5b7/0x980 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x394/0x580 kernel/locking/lockdep.c:3913
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
 remove_wait_queue+0x81/0x350 kernel/sched/wait.c:50
 ep_remove_wait_queue fs/eventpoll.c:595 [inline]
 ep_unregister_pollwait.isra.7+0x18c/0x590 fs/eventpoll.c:613
 ep_free+0x13f/0x320 fs/eventpoll.c:830
 ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:862
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:0000000000a2fa08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000071bec8 RCX: 0000000000452ac9
RDX: 0000000000000000 RSI: 00000000007218a8 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000d77
R10: 000000000000000c R11: 0000000000000202 R12: 0000000000a2f9b0
R13: 000000000071bea0 R14: 000000000000016d R15: 000000000000000c

Allocated by task 30503:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3610
 kmalloc include/linux/slab.h:499 [inline]
 kzalloc include/linux/slab.h:688 [inline]
 binder_get_thread+0x1cf/0x870 drivers/android/binder.c:4219
 binder_poll+0x8c/0x390 drivers/android/binder.c:4321
 ep_item_poll.isra.10+0xec/0x320 fs/eventpoll.c:884
 ep_insert+0x6a3/0x1b10 fs/eventpoll.c:1455
 SYSC_epoll_ctl fs/eventpoll.c:2106 [inline]
 SyS_epoll_ctl+0x12e4/0x1ab0 fs/eventpoll.c:1992
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 30503:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 binder_free_thread drivers/android/binder.c:4246 [inline]
 binder_thread_dec_tmpref+0x27f/0x310 drivers/android/binder.c:1821
 binder_thread_release+0x27d/0x540 drivers/android/binder.c:4310
 binder_ioctl+0xc02/0x1417 drivers/android/binder.c:4527
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801cf278780
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 200 bytes inside of
 512-byte region [ffff8801cf278780, ffff8801cf278980)
The buggy address belongs to the page:
page:000000004d0f884d count:1 mapcount:0 mapping:000000000db0b807 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cf278000 0000000000000000 0000000100000006
raw: ffffea0007444220 ffffea0007373e20 ffff8801dac00940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cf278700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801cf278780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801cf278800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff8801cf278880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cf278900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================