[....] Starting OpenBSD Secure Shell server: sshd[   21.082041] 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: [   24.757826] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   25.079729] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   26.197711] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available)
[   26.375012] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available)
[   26.483365] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts.
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[   32.018207] page:ffffea00072d8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   32.026411] flags: 0x8000000000004004(referenced|head)
[   32.032951] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   32.039334] ------------[ cut here ]------------
[   32.044073] kernel BUG at mm/filemap.c:819!
[   32.048371] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   32.054191] Dumping ftrace buffer:
[   32.057704]    (ftrace buffer empty)
[   32.061391] Modules linked in:
[   32.064695] CPU: 0 PID: 3723 Comm: syz-executor227 Not tainted 4.4.129-g23eaecc #27
[   32.072470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.081798] task: ffff8801ce06c800 task.stack: ffff8801ce400000
[   32.087829] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   32.096162] RSP: 0018:ffff8801ce4077d8  EFLAGS: 00010293
[   32.101584] RAX: ffffffff83a6e7c0 RBX: ffffea00072d8000 RCX: 0000000000000000
[   32.108830] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8801ce06d0dc
[   32.116075] RBP: ffff8801ce4077f8 R08: 0000000000000001 R09: 0000000000000000
[   32.123320] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   32.130565] R13: ffff8801ce407aa8 R14: ffffea00072d9480 R15: ffffea00072d8008
[   32.137811] FS:  00007fa1e6fa5700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   32.146012] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.151868] CR2: 00000000204a4ff0 CR3: 00000001d1a0c000 CR4: 00000000001606f0
[   32.159113] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.166358] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.173599] Stack:
[   32.175731]  ffffea00072d8000 dffffc0000000000 ffff8801ce407aa8 ffffea00072d9480
[   32.183736]  ffff8801ce4078e0 ffffffff812cc1bc 0000000000000001 ffff8801ce407890
[   32.191732]  0000000000000046 ffff8801d1a84f00 00000000ce06d0d8 ffff8801ce407ab8
[   32.199730] Call Trace:
[   32.202297]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   32.207982]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   32.214452]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   32.221362]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   32.227221]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   32.232820]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   32.238764]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   32.244189]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   32.250309]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   32.256429]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   32.261767]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   32.267889]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   32.273926]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   32.280749]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   32.286607]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   32.291947]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   32.297718]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   32.303925]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   32.309436]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   32.314773]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   32.320372]  [<ffffffff838bfc98>] ? retint_user+0x18/0x3c
[   32.325885]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   32.332447]  [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   32.338999] 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 f1 b1 0d 00 e9 0a ff ff ff e8 e7 b1 0d 00 e9 
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[   32.366015] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   32.372003]  RSP <ffff8801ce4077d8>
[   32.376117] ---[ end trace 135ad2180e957631 ]---
[   32.381311] Kernel panic - not syncing: Fatal exception
[   32.387256] Dumping ftrace buffer:
[   32.390793]    (ftrace buffer empty)
[   32.394480] Kernel Offset: disabled
[   32.398080] Rebooting in 86400 seconds..