random: sshd: uninitialized urandom read (32 bytes read, 114 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 ffff8801d15d4838 by task syzkaller671244/3317

CPU: 0 PID: 3317 Comm: syzkaller671244 Not tainted 4.4.111-g3301b55 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 a7d6f867eeabf873 ffff8801d09678d0 ffffffff81d0509d
 ffffea0007457500 ffff8801d15d4838 0000000000000000 ffff8801d15d4838
 0000000000000000 ffff8801d0967908 ffffffff814fd433 ffff8801d15d4838
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
 [<ffffffff83775899>] entry_SYSCALL_64_fastpath+0x16/0x92

Allocated by task 3317:
 [<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
 [<ffffffff83775899>] entry_SYSCALL_64_fastpath+0x16/0x92

Freed by task 3317:
 [<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
 [<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
 [<ffffffff83775899>] entry_SYSCALL_64_fastpath+0x16/0x92

The buggy address belongs to the object at ffff8801d15d4780
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8801d15d4780, ffff8801d15d4980)
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: 1734 Comm: udevd Not tainted 4.4.111-g3301b55 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b64e4740 task.stack: ffff8801d3a30000
RIP: 0010:[<ffffffff81b4d32b>]  [<ffffffff81b4d32b>] avc_search_node security/selinux/avc.c:584 [inline]
RIP: 0010:[<ffffffff81b4d32b>]  [<ffffffff81b4d32b>] avc_lookup security/selinux/avc.c:612 [inline]
RIP: 0010:[<ffffffff81b4d32b>]  [<ffffffff81b4d32b>] avc_has_perm_noaudit+0x1bb/0x460 security/selinux/avc.c:1112
RSP: 0018:ffff8801d3a37748  EFLAGS: 00010a07
RAX: 1d2000dc1b1d015c RBX: e90006e0d8e80ae7 RCX: ffffffff81b4d324
RDX: 0000000000000000 RSI: ffffffff839fd920 RDI: ffff8800b64e4fac
RBP: ffff8801d3a37818 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003a746eb4 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8801d3a37858 R15: 0000000000000007
FS:  00007f6dc7aad7a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564c6a9f60f0 CR3: 00000001d3a3c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81b4d212 ffff8800b64e4ff8 0000000700000000 1ffff1003a746eee
 0000000500400000 0000000041b58ab3 ffffffff83fc7cae ffffffff81b4d170
 ffffffff8151b8ed ffffffff83775899 ffffffffffffffff ffffffff814fcd42
Call Trace:
 [<ffffffff81b582d1>] selinux_inode_permission+0x281/0x4b0 security/selinux/hooks.c:2917
 [<ffffffff81b442df>] security_inode_permission+0xaf/0xf0 security/security.c:600
 [<ffffffff8153b8e3>] __inode_permission2+0x93/0x240 fs/namei.c:424
 [<ffffffff8153baef>] inode_permission2+0x2f/0x100 fs/namei.c:474
 [<ffffffff81547aec>] may_lookup fs/namei.c:1663 [inline]
 [<ffffffff81547aec>] link_path_walk+0x1ac/0x16e0 fs/namei.c:1927
 [<ffffffff8154b7fd>] path_openat+0x22d/0x3b60 fs/namei.c:3353
 [<ffffffff81551db7>] do_filp_open+0x197/0x290 fs/namei.c:3388
 [<ffffffff8151b753>] do_sys_open+0x343/0x4b0 fs/open.c:1038
 [<ffffffff8151b8ed>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8151b8ed>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff83775899>] entry_SYSCALL_64_fastpath+0x16/0x92
Code: 5b 28 e8 89 7b 73 ff 48 85 db 0f 84 6f 01 00 00 e8 6b 2b 81 ff 48 83 eb 28 0f 84 60 01 00 00 e8 5c 2b 81 ff 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 66 02 00 00 44 3b 2b 75 
RIP  [<ffffffff81b4d32b>] avc_search_node security/selinux/avc.c:584 [inline]
RIP  [<ffffffff81b4d32b>] avc_lookup security/selinux/avc.c:612 [inline]
RIP  [<ffffffff81b4d32b>] avc_has_perm_noaudit+0x1bb/0x460 security/selinux/avc.c:1112
 RSP <ffff8801d3a37748>
---[ end trace 1436ef2e04008e0f ]---