random: sshd: uninitialized urandom read (32 bytes read, 113 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 ffff8801d2ef6838 by task syzkaller134813/3319

CPU: 0 PID: 3319 Comm: syzkaller134813 Not tainted 4.4.111-g7902639 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 1bdd999f595b3ebb ffff8801d0c5f850 ffffffff81d0509d
 ffffea00074bbd80 ffff8801d2ef6838 0000000000000000 ffff8801d2ef6838
 0000000000000000 ffff8801d0c5f888 ffffffff814fd433 ffff8801d2ef6838
Call Trace:
 [<ffffffff81d0509d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0509d>] 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
 [<ffffffff8377546e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff8377546e>] _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
 [<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
 [<ffffffff8377722a>] sysenter_flags_fixed+0xd/0x17

Allocated by task 3319:
 [<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
 [<ffffffff82c7ec51>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7ec51>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7ec51>] binder_get_thread+0x181/0x7a0 drivers/android/binder.c:4452
 [<ffffffff82c7f2ba>] 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
 [<ffffffff8377722a>] sysenter_flags_fixed+0xd/0x17

Freed by task 3319:
 [<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
 [<ffffffff82c781a1>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c781a1>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c78cdd>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c93944>] 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
 [<ffffffff8377722a>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801d2ef6780
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d2ef6780, ffff8801d2ef6980)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3297 Comm: getty Not tainted 4.4.111-g7902639 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d209af80 task.stack: ffff8801d1898000
RIP: 0010:[<ffffffff81d14e4e>]  [<ffffffff81d14e4e>] ____rb_erase_color lib/rbtree.c:263 [inline]
RIP: 0010:[<ffffffff81d14e4e>]  [<ffffffff81d14e4e>] __rb_erase_color+0x17e/0x1460 lib/rbtree.c:399
RSP: 0000:ffff8801d189f738  EFLAGS: 00010203
RAX: 5028454741505f4e RBX: dffffc0000000000 RCX: ffff8801d896d388
RDX: ffffffff8148af00 RSI: 0a0508a8e82a0be9 RDI: ffffffff838a8368
RBP: ffff8801d189f788 R08: ffff8801d2017cf8 R09: ffffffff85142900
R10: 0000000000000001 R11: 1ffff1003a313ed0 R12: ffff8801d2017cf0
R13: ffffffff838a8360 R14: ffffed003b12da71 R15: 2862616c53656761
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001d3324000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 dffffc0000000000 ffff8801d209b7e8 ffff8801d2017cf8 ffff8801d896d388
 ffffffff8148af00 ffff8801d3acea08 dffffc0000000000 000000000000001f
 ffff8801d2017cf0 ffff8801d2017cf0 ffff8801d189f800 ffffffff8148c14a
Call Trace:
 [<ffffffff8148c14a>] rb_erase_augmented include/linux/rbtree_augmented.h:246 [inline]
 [<ffffffff8148c14a>] vma_interval_tree_remove+0x88a/0xde0 mm/interval_tree.c:24
 [<ffffffff814a8155>] __remove_shared_vm_struct+0xb5/0xe0 mm/mmap.c:259
 [<ffffffff814aa1c3>] unlink_file_vma+0x83/0xb0 mm/mmap.c:274
 [<ffffffff81497e06>] free_pgtables+0x226/0x330 mm/memory.c:555
 [<ffffffff814b3753>] exit_mmap+0x1e3/0x3a0 mm/mmap.c:2926
 [<ffffffff81123428>] __mmput kernel/fork.c:715 [inline]
 [<ffffffff81123428>] mmput+0xf8/0x2d0 kernel/fork.c:735
 [<ffffffff81132d9b>] exit_mm kernel/exit.c:440 [inline]
 [<ffffffff81132d9b>] do_exit+0x75b/0x2a20 kernel/exit.c:742
 [<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
 [<ffffffff81006373>] prepare_exit_to_usermode+0xe3/0x100 arch/x86/entry/common.c:282
 [<ffffffff83776448>] retint_user+0x8/0x3c
Code: 89 fd 4d 8b 7f 10 49 8d 7d 08 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 c1 0b 00 00 49 8b 45 08 48 85 c0 74 1a 48 89 c6 48 c1 ee 03 <80> 3c 1e 00 0f 85 7a 0b 00 00 f6 00 01 0f 84 1a 03 00 00 4d 85 
RIP  [<ffffffff81d14e4e>] ____rb_erase_color lib/rbtree.c:263 [inline]
RIP  [<ffffffff81d14e4e>] __rb_erase_color+0x17e/0x1460 lib/rbtree.c:399
 RSP <ffff8801d189f738>
---[ end trace c4fb81db1ed73439 ]---