[....] Starting OpenBSD Secure Shell server: sshd[   19.342036] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.371589] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   23.683198] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   24.709213] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available)
[   24.875472] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available)
[   24.980763] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts.
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[   30.421614] page:ffffea0002c08000 count:2 mapcount:0 mapping:          (null) index:0x0
[   30.429983] flags: 0x4000000000004004(referenced|head)
[   30.435605] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   30.442237] ------------[ cut here ]------------
[   30.446977] kernel BUG at mm/filemap.c:819!
[   30.451273] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   30.457115] Dumping ftrace buffer:
[   30.460638]    (ftrace buffer empty)
[   30.464331] Modules linked in:
[   30.467618] CPU: 1 PID: 3735 Comm: syz-executor374 Not tainted 4.4.128-gbd23e3a #20
[   30.475385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.484716] task: ffff8801ce31c800 task.stack: ffff8801cc9f0000
[   30.490744] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   30.499075] RSP: 0018:ffff8801cc9f77d8  EFLAGS: 00010293
[   30.504493] RAX: ffffffff83a6e7c0 RBX: ffffea0002c08000 RCX: 0000000000000000
[   30.511736] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8801ce31d0dc
[   30.518978] RBP: ffff8801cc9f77f8 R08: 0000000000000001 R09: 0000000000000000
[   30.526221] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   30.533462] R13: ffff8801cc9f7aa8 R14: ffffea0002c09480 R15: ffffea0002c08008
[   30.540704] FS:  00007f9f05431700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   30.548900] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.554752] CR2: 00000000204a4ff0 CR3: 00000001cdf5a000 CR4: 0000000000160670
[   30.561998] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   30.569238] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   30.576476] Stack:
[   30.578596]  ffffea0002c08000 dffffc0000000000 ffff8801cc9f7aa8 ffffea0002c09480
[   30.586578]  ffff8801cc9f78e0 ffffffff812cc19c 0000000000000001 ffff8801cc9f7890
[   30.594557]  0000000000000046 ffff8801ce38d400 00000000ce31d0d8 ffff8801cc9f7ab8
[   30.602535] Call Trace:
[   30.605102]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   30.610790]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   30.617254]  [<ffffffff838bdd15>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   30.624150]  [<ffffffff812cc979>] futex_wait_setup+0xd9/0x330
[   30.630013]  [<ffffffff812cc8a0>] ? futex_wake+0x460/0x460
[   30.635609]  [<ffffffff8129d123>] ? __hrtimer_init+0x143/0x1e0
[   30.641551]  [<ffffffff812cce7f>] futex_wait+0x2af/0x600
[   30.646974]  [<ffffffff812ccbd0>] ? futex_wait_setup+0x330/0x330
[   30.653090]  [<ffffffff8129b480>] ? clock_was_set_work+0x30/0x30
[   30.659208]  [<ffffffff812d0792>] do_futex+0x2a2/0x1770
[   30.664545]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   30.670664]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   30.676698]  [<ffffffff8122e67b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   30.683509]  [<ffffffff8129a6ea>] ? ktime_add_safe+0xea/0x150
[   30.689363]  [<ffffffff8129a600>] ? SyS_alarm+0x20/0x20
[   30.694701]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   30.700472]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   30.706676]  [<ffffffff812d1ee4>] ? SyS_futex+0x284/0x300
[   30.712186]  [<ffffffff812d1e50>] SyS_futex+0x1f0/0x300
[   30.717521]  [<ffffffff812d1c60>] ? do_futex+0x1770/0x1770
[   30.723115]  [<ffffffff838bf318>] ? retint_user+0x18/0x3c
[   30.728626]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   30.735179]  [<ffffffff838be765>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   30.741725] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 f8 be df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 8a 32 f3 ff 48 c7 c6 60 aa a9 83 48 89 df e8 4b eb 06 00 <0f> 0b 48 89 df e8 61 af 0d 00 e9 0a ff ff ff e8 57 af 0d 00 e9 
[   30.768466] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   30.774442]  RSP <ffff8801cc9f77d8>
[   30.778430] ---[ end trace b285b0261934edaa ]---
[   30.783937] Kernel panic - not syncing: Fatal exception
[   30.789720] Dumping ftrace buffer:
[   30.793231]    (ftrace buffer empty)
[   30.796919] Kernel Offset: disabled
[   30.800519] Rebooting in 86400 seconds..