[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.300356] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.033422] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[   22.484346] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[   23.463417] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts.
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[   39.864085] page:ffffea0007320000 count:2 mapcount:0 mapping:          (null) index:0x0
[   39.872842] flags: 0x8000000000004004(referenced|head)
[   39.878452] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   39.884797] ------------[ cut here ]------------
[   39.889531] kernel BUG at mm/filemap.c:819!
[   39.893826] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   39.899628] Dumping ftrace buffer:
[   39.903136]    (ftrace buffer empty)
[   39.906816] Modules linked in:
[   39.910106] CPU: 0 PID: 3705 Comm: syz-executor836 Not tainted 4.4.131-g033c952 #37
[   39.917869] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.927195] task: ffff8800b1cf1800 task.stack: ffff8801d3f40000
[   39.933222] RIP: 0010:[<ffffffff8141de15>]  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   39.941555] RSP: 0018:ffff8801d3f477d8  EFLAGS: 00010293
[   39.946976] RAX: ffffffff83a6e7c0 RBX: ffffea0007320000 RCX: 0000000000000000
[   39.954216] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8800b1cf20dc
[   39.961456] RBP: ffff8801d3f477f8 R08: 0000000000000001 R09: 0000000000000000
[   39.968696] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   39.975944] R13: ffff8801d3f47aa8 R14: ffffea0007321480 R15: ffffea0007320008
[   39.983193] FS:  00007f8c7d190700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   39.991390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   39.997253] CR2: 00000000204a4ff0 CR3: 00000000b1ede000 CR4: 00000000001606f0
[   40.004845] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   40.012092] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   40.019331] Stack:
[   40.021451]  ffffea0007320000 dffffc0000000000 ffff8801d3f47aa8 ffffea0007321480
[   40.029429]  ffff8801d3f478e0 ffffffff812cc1bc 0000000000000001 ffff8801d3f47890
[   40.037408]  0000000000000046 ffff8800b2adc000 00000000b1cf20d8 ffff8801d3f47ab8
[   40.045401] Call Trace:
[   40.047965]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   40.053651]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   40.060115]  [<ffffffff838bf305>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   40.067013]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   40.072869]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   40.078474]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   40.084418]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   40.089838]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   40.095954]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   40.102075]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   40.107417]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   40.113815]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   40.119848]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   40.126660]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   40.132515]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   40.137848]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   40.143617]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   40.149831]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   40.155341]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   40.160674]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   40.166270]  [<ffffffff838c0918>] ? retint_user+0x18/0x3c
[   40.171779]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   40.178337]  [<ffffffff838bfd65>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   40.184884] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 48 c0 df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 da 33 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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[   40.211674] RIP  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   40.217655]  RSP <ffff8801d3f477d8>
[   40.221731] ---[ end trace c41a4a72872cc6c7 ]---
[   40.226786] Kernel panic - not syncing: Fatal exception
[   40.232491] Dumping ftrace buffer:
[   40.236003]    (ftrace buffer empty)
[   40.239687] Kernel Offset: disabled
[   40.243296] Rebooting in 86400 seconds..