random: sshd: uninitialized urandom read (32 bytes read, 120 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 ffff8801d0afc5b8 by task syzkaller122763/3314

CPU: 1 PID: 3314 Comm: syzkaller122763 Not tainted 4.4.111-g1849cd3 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 9eafd24318a31a34 ffff8801d0b6f850 ffffffff81d0509d
 ffffea000742bf00 ffff8801d0afc5b8 0000000000000000 ffff8801d0afc5b8
 0000000000000000 ffff8801d0b6f888 ffffffff814fd433 ffff8801d0afc5b8
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 3314:
 [<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 3314:
 [<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 ffff8801d0afc500
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d0afc500, ffff8801d0afc700)
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: 0 PID: 490 Comm: khugepaged Not tainted 4.4.111-g1849cd3 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bbbe8000 task.stack: ffff8800bac08000
RIP: 0010:[<ffffffff81d681f8>]  [<ffffffff81d681f8>] __debug_check_no_obj_freed lib/debugobjects.c:689 [inline]
RIP: 0010:[<ffffffff81d681f8>]  [<ffffffff81d681f8>] debug_check_no_obj_freed+0x1a8/0x9b0 lib/debugobjects.c:726
RSP: 0018:ffff8800bac0f8f8  EFLAGS: 00010803
RAX: 0000000000000282 RBX: ffff8801cc800000 RCX: 0000000000000004
RDX: 1d2000dc1b1d0161 RSI: ffff8800bac0f988 RDI: ffffffff8148f9a9
RBP: ffff8800bac0f9f0 R08: 1ffffffff0291f35 R09: ffffffff8512a880
R10: dead000000000200 R11: 1ffff10017581ee6 R12: ed04cee8ffffff45
R13: ffff8801cc600000 R14: e90006e0d8e80b0f R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f5cb3300d0 CR3: 00000000b45d8000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db223448 ffff8800bbbe8000 ffff8800bbbe8870 00000000000000ef
 1ffff10017581f2d ffffffff8582f080 ffff8801cc800000 ffff8801cc800000
 0000000000000046 0000000000000246 00000000000d0640 fffffbfff0b05e10
Call Trace:
 [<ffffffff8142d0b9>] free_pages_prepare+0x4a9/0xb30 mm/page_alloc.c:1049
 [<ffffffff8143211c>] __free_pages_ok+0x1c/0xbd0 mm/page_alloc.c:1064
 [<ffffffff81432d2e>] free_compound_page+0x5e/0x70 mm/page_alloc.c:504
 [<ffffffff814460b1>] __put_compound_page+0xa1/0xf0 mm/swap.c:89
 [<ffffffff8144709b>] put_compound_page+0xdb/0xb80 mm/swap.c:249
 [<ffffffff81447b7d>] put_page+0x3d/0x110 mm/swap.c:275
 [<ffffffff81505fab>] khugepaged_do_scan mm/huge_memory.c:2934 [inline]
 [<ffffffff81505fab>] khugepaged+0x35b/0x2ac0 mm/huge_memory.c:2961
 [<ffffffff811908e8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83775c9f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:494
Code: 48 c7 c6 40 ea 75 85 4c 8b 34 0e 4d 85 f6 0f 84 c5 03 00 00 49 ba 00 02 00 00 00 00 ad de 31 c9 48 8d 75 98 4c 89 f2 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 f0 03 00 00 49 8d 7e 18 83 c1 01 49 8b 16 
RIP  [<ffffffff81d681f8>] __debug_check_no_obj_freed lib/debugobjects.c:689 [inline]
RIP  [<ffffffff81d681f8>] debug_check_no_obj_freed+0x1a8/0x9b0 lib/debugobjects.c:726
 RSP <ffff8800bac0f8f8>
---[ end trace 41c9caf2076fac65 ]---