random: sshd: uninitialized urandom read (32 bytes read, 88 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 ffff8800abcf79b8 by task syzkaller167423/4044

CPU: 0 PID: 4044 Comm: syzkaller167423 Not tainted 4.4.113-g962d1f3 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 5563743c69059f3a ffff8801d820f870 ffffffff81d028ed
 ffffea0002af3d80 ffff8800abcf79b8 0000000000000000 ffff8800abcf79b8
 0000000000000000 ffff8801d820f8a8 ffffffff814fd1c3 ffff8800abcf79b8
Call Trace:
 [<ffffffff81d028ed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d028ed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd1c3>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fd6d5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fd6d5>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fd834>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239dae>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c8ee>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff8377188e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff8377188e>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff8121f214>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f5948>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f5948>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f6673>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f67e4>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff815224d3>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff815229f5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b9d4>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f7a>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f7a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
 [<ffffffff81139418>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8113964d>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff8113964d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377362a>] sysenter_flags_fixed+0xd/0x17

Allocated by task 4044:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc233>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc4fd>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc4fd>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8480>] kmem_cache_alloc_trace+0x100/0x2b0 mm/slub.c:2642
 [<ffffffff82c7b5cd>] kmalloc include/linux/slab.h:476 [inline]
 [<ffffffff82c7b5cd>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff82c7b5cd>] binder_get_thread+0x15d/0x750 drivers/android/binder.c:4452
 [<ffffffff82c7bc0a>] binder_poll+0x4a/0x210 drivers/android/binder.c:4555
 [<ffffffff815f97c1>] ep_item_poll fs/eventpoll.c:806 [inline]
 [<ffffffff815f97c1>] ep_insert fs/eventpoll.c:1319 [inline]
 [<ffffffff815f97c1>] SYSC_epoll_ctl fs/eventpoll.c:1934 [inline]
 [<ffffffff815f97c1>] SyS_epoll_ctl+0x10b1/0x2040 fs/eventpoll.c:1833
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377362a>] sysenter_flags_fixed+0xd/0x17

Freed by task 4044:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc233>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fcb52>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fcb52>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f95ec>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f95ec>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f95ec>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f95ec>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82c74b31>] binder_free_thread drivers/android/binder.c:4480 [inline]
 [<ffffffff82c74b31>] binder_thread_dec_tmpref+0x1c1/0x250 drivers/android/binder.c:2036
 [<ffffffff82c7566d>] binder_thread_release+0x27d/0x540 drivers/android/binder.c:4544
 [<ffffffff82c90294>] binder_ioctl+0xb94/0x12e0 drivers/android/binder.c:4760
 [<ffffffff8161d15a>] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline]
 [<ffffffff8161d15a>] compat_SyS_ioctl+0x28a/0x2540 fs/compat_ioctl.c:1544
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377362a>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8800abcf7900
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 184 bytes inside of
 512-byte region [ffff8800abcf7900, ffff8800abcf7b00)
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: 0 Comm: swapper/1 Not tainted 4.4.113-g962d1f3 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b497c0 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff812765a5>]  [<ffffffff812765a5>] irqd_has_set kernel/irq/internals.h:188 [inline]
RIP: 0010:[<ffffffff812765a5>]  [<ffffffff812765a5>] irq_may_run+0x45/0x100 kernel/irq/chip.c:379
RSP: 0018:ffff8801db307e80  EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8801d4b1cc80 RCX: ffffffff81276571
RDX: 0000000000000000 RSI: ffffffff850d1ea0 RDI: ffff8801d4b1ccb0
RBP: ffff8801db307e98 R08: 0000000000000001 R09: ffffffff850d1ea0
R10: 0000000000000000 R11: 1ffff1003b660f9c R12: 0000000000000000
R13: ffff8801d9b5fd80 R14: ffff8801d9b58000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d069b63110 CR3: 00000001da3cc000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d4b1cc80 ffff8801d4b1ccf4 ffff8801d9b5fd80 ffff8801db307f00
 ffffffff81277879 ffff8801d9b4a028 00000000db307f10 0000000000000046
 ffff8801d9b4a030 0000000000000000 ffff8801d4b1cd20 ffff8801d4b1cc80
Call Trace:
 <IRQ> 
 [<ffffffff81277879>] handle_edge_irq+0x69/0x8e0 kernel/irq/chip.c:585
 [<ffffffff81016900>] generic_handle_irq_desc include/linux/irqdesc.h:140 [inline]
 [<ffffffff81016900>] handle_irq+0x250/0x3a0 arch/x86/kernel/irq_64.c:78
 [<ffffffff83774759>] do_IRQ+0x89/0x1b0 arch/x86/kernel/irq.c:239
 [<ffffffff83772820>] common_interrupt+0xa0/0xa0 arch/x86/entry/entry_64.S:592
 <EOI> 
 [<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff81220588>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220c8d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220c8d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220c8d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adaf4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c2 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 30 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 89 00 00 00 41 f7 04 24 00 
RIP  [<ffffffff812765a5>] irqd_has_set kernel/irq/internals.h:188 [inline]
RIP  [<ffffffff812765a5>] irq_may_run+0x45/0x100 kernel/irq/chip.c:379
 RSP <ffff8801db307e80>
---[ end trace e617dbb565fcaa31 ]---