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 ffff8800b42fcab8 by task syzkaller211337/3335

CPU: 1 PID: 3335 Comm: syzkaller211337 Not tainted 4.4.111-g7902639 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 092fcc29c48c0e91 ffff8800b5377580 ffffffff81d0509d
 ffffea0002d0bf00 ffff8800b42fcab8 0000000000000000 ffff8800b42fcab8
 0000000000000000 ffff8800b53775b8 ffffffff814fd433 ffff8800b42fcab8
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
 [<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
 [<ffffffff81006545>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006545>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff83775a1d>] int_ret_from_sys_call+0x25/0xa3

Allocated by task 3335:
 [<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 3335:
 [<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 ffff8800b42fca00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8800b42fca00, ffff8800b42fcc00)
The buggy address belongs to the page:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000062
IP: [<ffffffff838a836b>] str__compaction__trace_system_name+0x56b/0xfa0
PGD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-g7902639 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84217840 task.stack: ffffffff84200000
RIP: 0010:[<ffffffff838a836b>]  [<ffffffff838a836b>] str__compaction__trace_system_name+0x56b/0xfa0
RSP: 0018:ffff8801db207d00  EFLAGS: 00010206
RAX: ffffffff838a8360 RBX: ffff8801db207d50 RCX: ffffffff8129fe5b
RDX: 0000000000000100 RSI: ffffffff842bcb20 RDI: ffffffff8129fe6b
RBP: ffff8801db207dd8 R08: 0000000000000001 R09: ffffffff850ed1d0
R10: 0000000000000000 R11: 1ffff1003b640f6c R12: 1ffff1003b640fa6
R13: ffff8800b4191030 R14: 0000000000000101 R15: ffff8801db207dd8
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000062 CR3: 00000000b5ff8000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838a8360 ffffffff8129fdbc 0000000000000000 0000000000000000
 0000000000000000 ffffffff838a8360 0000000041b58ab3 ffffffff83fa8b49
 ffffffff8129fce0 ffffffff842180b0 ffff8801db207d50 ffffffff851bbb20
Call Trace:
 <IRQ> 
 [<ffffffff812a1f74>] __run_timers kernel/time/timer.c:1254 [inline]
 [<ffffffff812a1f74>] run_timer_softirq+0x604/0xbb0 kernel/time/timer.c:1437
 [<ffffffff83778dbd>] __do_softirq+0x24d/0xa59 kernel/softirq.c:273
 [<ffffffff8113da09>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113da09>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff837784fb>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff837784fb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff83777450>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:725
 <EOI> 
 [<ffffffff81027e15>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027e15>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102938a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff81220508>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220c15>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220c15>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220c15>] cpu_startup_entry+0x605/0x820 kernel/sched/idle.c:301
 [<ffffffff837628b9>] rest_init+0x189/0x190 init/main.c:410
 [<ffffffff84820811>] start_kernel+0x6b9/0x6ee init/main.c:682
 [<ffffffff8481f312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff8481f454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 56 4d 5f 42 55 47 5f 4f 4e 5f 50 <41> 47 45 28 50 61 67 65 53 6c 61 62 28 70 61 67 65 29 29 00 00 
RIP  [<ffffffff838a836b>] str__compaction__trace_system_name+0x56b/0xfa0
 RSP <ffff8801db207d00>
CR2: 0000000000000062
---[ end trace 3ee9b0969b682855 ]---