random: sshd: uninitialized urandom read (32 bytes read, 115 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 ffff8801d0d619b8 by task syzkaller150974/3314

CPU: 1 PID: 3314 Comm: syzkaller150974 Not tainted 4.4.112-g3fc4284 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 a6d224e5348effbf ffff8801d04c7850 ffffffff81d054ed
 ffffea0007435800 ffff8801d0d619b8 0000000000000000 ffff8801d0d619b8
 0000000000000000 ffff8801d04c7888 ffffffff814fd953 ffff8801d0d619b8
Call Trace:
 [<ffffffff81d054ed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d054ed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd953>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fde65>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fde65>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fdfc4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239c7e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c7be>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff83775dbe>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff83775dbe>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff8121f164>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f6d58>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f6d58>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f7a83>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f7bf4>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff81522f93>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff815234b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bb54>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f21>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f21>] do_exit+0x871/0x2a20 kernel/exit.c:755
 [<ffffffff81139398>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff811395cd>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff811395cd>] 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
 [<ffffffff83777b6a>] sysenter_flags_fixed+0xd/0x17

Allocated by task 3314:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fcc8d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fcc8d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8c00>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7f331>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7f331>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7f331>] binder_get_thread+0x181/0x7a0 drivers/android/binder.c:4452
 [<ffffffff82c7f99a>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815fabe1>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815fabe1>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815fabe1>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815fabe1>] 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
 [<ffffffff83777b6a>] sysenter_flags_fixed+0xd/0x17

Freed by task 3314:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd2e2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd2e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f9d6c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f9d6c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f9d6c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f9d6c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c78881>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c78881>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c793bd>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c94024>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff8161e61a>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8161e61a>] 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
 [<ffffffff83777b6a>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801d0d61900
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d0d61900, ffff8801d0d61b00)
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: 1734 Comm: udevd Not tainted 4.4.112-g3fc4284 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d3acaf80 task.stack: ffff8801d3b60000
RIP: 0010:[<ffffffff8153bea9>]  [<ffffffff8153bea9>] do_inode_permission fs/namei.c:379 [inline]
RIP: 0010:[<ffffffff8153bea9>]  [<ffffffff8153bea9>] __inode_permission2+0x139/0x240 fs/namei.c:416
RSP: 0018:ffff8801d3b67908  EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8801cd431f40 RCX: ffffffff8153be94
RDX: 0000000000000003 RSI: ffff8801cd431f40 RDI: 0000000000000018
RBP: ffff8801d3b67938 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003a76cec2 R12: ffff8801d9857820
R13: 0000000000000001 R14: ffff8801cd431f42 R15: 0000000000000000
FS:  00007fa4cc0407a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556bff451110 CR3: 00000001d3b3a000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800bb410840 0000000000000001 ffff8801cd431f40 ffff8801d9857820
 ffff8801d3b67d40 ffff8800b4561129 ffff8801d3b67968 ffffffff8153c00f
 ffff8801d9857820 0000000000000000 ffff8801cd431f40 ffff8801d3b67d40
Call Trace:
 [<ffffffff8153c00f>] inode_permission2+0x2f/0x100 fs/namei.c:474
 [<ffffffff81548708>] may_lookup fs/namei.c:1669 [inline]
 [<ffffffff81548708>] link_path_walk+0x8a8/0x16e0 fs/namei.c:1927
 [<ffffffff8154bd1d>] path_openat+0x22d/0x3b60 fs/namei.c:3353
 [<ffffffff815522d7>] do_filp_open+0x197/0x290 fs/namei.c:3388
 [<ffffffff8151bc73>] do_sys_open+0x343/0x4b0 fs/open.c:1038
 [<ffffffff8151be0d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8151be0d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff837761d9>] entry_SYSCALL_64_fastpath+0x16/0x92
Code: 02 00 0f 85 ff 00 00 00 4d 85 e4 4c 8b 7b 20 74 5a e8 bc 3f e2 ff 49 8d 7f 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e6 00 00 00 49 8b 47 18 48 85 c0 48 89 45 d0 
RIP  [<ffffffff8153bea9>] do_inode_permission fs/namei.c:379 [inline]
RIP  [<ffffffff8153bea9>] __inode_permission2+0x139/0x240 fs/namei.c:416
 RSP <ffff8801d3b67908>
---[ end trace ad6734be71ae9af3 ]---