random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available)
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801d0d5cd38 by task syzkaller846959/3324

CPU: 0 PID: 3324 Comm: syzkaller846959 Not tainted 4.4.111-gc2f631b #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 e83b53235a0a8ca6 ffff8800b426f8d0 ffffffff81d0513d
 ffffea0007435700 ffff8801d0d5cd38 0000000000000000 ffff8801d0d5cd38
 0000000000000000 ffff8800b426f908 ffffffff814fd433 ffff8801d0d5cd38
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
 [<ffffffff8113955d>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff8113955d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff83775919>] entry_SYSCALL_64_fastpath+0x16/0x92

Allocated by task 3324:
 [<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 3324:
 [<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 ffff8801d0d5cc80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d0d5cc80, ffff8801d0d5ce80)
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: 1 Comm: init Not tainted 4.4.111-gc2f631b #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da308000 task.stack: ffff8801da310000
RIP: 0010:[<ffffffff8155cc52>]  [<ffffffff8155cc52>] do_select+0x9c2/0x13f0 fs/select.c:457
RSP: 0018:ffff8801da3177e8  EFLAGS: 00010202
RAX: 0000000000000007 RBX: ffff8800b3257a00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000038
RBP: ffff8801da317c28 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800b3257a00
R13: 0000000000000000 R14: 000000000000000a R15: 0000000000000400
FS:  00007fa0b2d777a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005562e172b0f0 CR3: 00000001d4112000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8155c355 00000000004c4b3c 0000000000000000 ffff8801da310000
 ffffed003b462f93 ffff8801da317cc0 ffff8801da317cb8 ffff8801da317cb0
 ffff8801da317920 1ffff1003b462f20 ffff8801da317ea0 ffff8801da317ca8
Call Trace:
 [<ffffffff8155da58>] core_sys_select+0x3d8/0x740 fs/select.c:599
 [<ffffffff8155df0a>] SYSC_select fs/select.c:640 [inline]
 [<ffffffff8155df0a>] SyS_select+0x14a/0x1d0 fs/select.c:622
 [<ffffffff83775919>] entry_SYSCALL_64_fastpath+0x16/0x92
Code: df 48 89 f8 48 c1 e8 03 80 3c 08 00 0f 85 b2 09 00 00 48 be 00 00 00 00 00 fc ff df 4c 8b 6b 28 49 8d 7d 38 48 89 f8 48 c1 e8 03 <80> 3c 30 00 0f 85 85 09 00 00 4d 8b 6d 38 41 83 e4 01 4d 85 ed 
RIP  [<ffffffff8155cc52>] do_select+0x9c2/0x13f0 fs/select.c:457
 RSP <ffff8801da3177e8>
---[ end trace 9dd7939b4d9dc346 ]---