[....] Starting OpenBSD Secure Shell server: sshd[   22.453934] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.026100] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   25.376730] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   26.551508] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available)
[   26.710794] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available)
[   26.819310] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts.
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[   32.232235] page:ffffea0007180000 count:2 mapcount:0 mapping:          (null) index:0x0
[   32.243167] flags: 0x8000000000004004(referenced|head)
[   32.248941] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   32.255274] ------------[ cut here ]------------
[   32.260014] kernel BUG at mm/filemap.c:819!
[   32.264309] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   32.270125] Dumping ftrace buffer:
[   32.273640]    (ftrace buffer empty)
[   32.277323] Modules linked in:
[   32.280612] CPU: 0 PID: 3845 Comm: syz-executor548 Not tainted 4.4.128-gbd23e3a #20
[   32.288379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.297723] task: ffff8800b7690000 task.stack: ffff8800b76a8000
[   32.303800] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   32.312144] RSP: 0018:ffff8800b76af7d8  EFLAGS: 00010293
[   32.318229] RAX: ffffffff83a6e7c0 RBX: ffffea0007180000 RCX: 0000000000000000
[   32.325518] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8800b76908dc
[   32.332776] RBP: ffff8800b76af7f8 R08: 0000000000000001 R09: 0000000000000000
[   32.340025] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   32.347273] R13: ffff8800b76afaa8 R14: ffffea0007181480 R15: ffffea0007180008
[   32.354520] FS:  00007fe7b5cc0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   32.362717] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.368572] CR2: 00000000204a4ff0 CR3: 00000000af8fc000 CR4: 0000000000160670
[   32.375835] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.383080] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.390762] Stack:
[   32.392895]  ffffea0007180000 dffffc0000000000 ffff8800b76afaa8 ffffea0007181480
[   32.400910]  ffff8800b76af8e0 ffffffff812cc19c 0000000000000001 ffff8800b76af890
[   32.408923]  0000000000000046 ffff8801d996e300 00000000b76908d8 ffff8800b76afab8
[   32.416902] Call Trace:
[   32.419474]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   32.425171]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   32.431830]  [<ffffffff838bdd15>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   32.438742]  [<ffffffff812cc979>] futex_wait_setup+0xd9/0x330
[   32.444606]  [<ffffffff812cc8a0>] ? futex_wake+0x460/0x460
[   32.450212]  [<ffffffff8129d123>] ? __hrtimer_init+0x143/0x1e0
[   32.456161]  [<ffffffff812cce7f>] futex_wait+0x2af/0x600
[   32.461589]  [<ffffffff812ccbd0>] ? futex_wait_setup+0x330/0x330
[   32.467715]  [<ffffffff8129b480>] ? clock_was_set_work+0x30/0x30
[   32.473844]  [<ffffffff812d0792>] do_futex+0x2a2/0x1770
[   32.479214]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   32.485335]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   32.491378]  [<ffffffff8122e67b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   32.498196]  [<ffffffff8129a6ea>] ? ktime_add_safe+0xea/0x150
[   32.505540]  [<ffffffff8129a600>] ? SyS_alarm+0x20/0x20
[   32.510880]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   32.516651]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   32.522864]  [<ffffffff812d1ee4>] ? SyS_futex+0x284/0x300
[   32.528375]  [<ffffffff812d1e50>] SyS_futex+0x1f0/0x300
[   32.533715]  [<ffffffff812d1c60>] ? do_futex+0x1770/0x1770
[   32.539321]  [<ffffffff838bf318>] ? retint_user+0x18/0x3c
[   32.544839]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   32.551399]  [<ffffffff838be765>] entry_SYSCALL_64_fastpath+0x22/0x9e
executing program
[   32.557951] 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 
[   32.584826] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   32.590813]  RSP <ffff8800b76af7d8>
[   32.595275] ---[ end trace d9c25b88dcacb42e ]---
[   32.600649] Kernel panic - not syncing: Fatal exception
[   32.606628] Dumping ftrace buffer:
[   32.610151]    (ftrace buffer empty)
[   32.613833] Kernel Offset: disabled
[   32.617430] Rebooting in 86400 seconds..