[....] 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[   21.072832] 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: [   25.880899] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   26.160175] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   27.184197] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts.
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[   52.814958] page:ffffea00071a8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   52.826089] flags: 0x8000000000004004(referenced|head)
[   52.832427] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   52.838777] ------------[ cut here ]------------
[   52.843533] kernel BUG at mm/filemap.c:819!
[   52.847850] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   52.853694] Dumping ftrace buffer:
[   52.857224]    (ftrace buffer empty)
[   52.860940] Modules linked in:
[   52.864256] CPU: 0 PID: 3862 Comm: syz-executor472 Not tainted 4.4.128-gbd23e3a #20
[   52.872073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.881427] task: ffff8801d922c800 task.stack: ffff8800bb388000
[   52.887709] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   52.896079] RSP: 0018:ffff8800bb38f7d8  EFLAGS: 00010293
[   52.901525] RAX: ffffffff83a6e7c0 RBX: ffffea00071a8000 RCX: 0000000000000000
[   52.908772] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8801d922d0dc
[   52.916021] RBP: ffff8800bb38f7f8 R08: 0000000000000001 R09: 0000000000000000
[   52.923274] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   52.930535] R13: ffff8800bb38faa8 R14: ffffea00071a9480 R15: ffffea00071a8008
[   52.937800] FS:  00007ff56884e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   52.946016] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   52.951984] CR2: 00000000204a4ff0 CR3: 00000000b3010000 CR4: 0000000000160670
[   52.959331] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   52.966587] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   52.973871] Stack:
[   52.976458]  ffffea00071a8000 dffffc0000000000 ffff8800bb38faa8 ffffea00071a9480
[   52.984522]  ffff8800bb38f8e0 ffffffff812cc19c 0000000000000001 ffff8800bb38f890
[   52.992643]  0000000000000046 ffff8801d1f59900 00000000d922d0d8 ffff8800bb38fab8
[   53.000701] Call Trace:
[   53.003296]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   53.008985]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   53.015656]  [<ffffffff838bdd15>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   53.022576]  [<ffffffff812cc979>] futex_wait_setup+0xd9/0x330
[   53.028535]  [<ffffffff812cc8a0>] ? futex_wake+0x460/0x460
[   53.034141]  [<ffffffff8129d123>] ? __hrtimer_init+0x143/0x1e0
[   53.040090]  [<ffffffff812cce7f>] futex_wait+0x2af/0x600
[   53.045520]  [<ffffffff812ccbd0>] ? futex_wait_setup+0x330/0x330
[   53.051669]  [<ffffffff8129b480>] ? clock_was_set_work+0x30/0x30
[   53.057797]  [<ffffffff812d0792>] do_futex+0x2a2/0x1770
[   53.063140]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   53.069278]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   53.075507]  [<ffffffff8122e67b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   53.082339]  [<ffffffff8129a6ea>] ? ktime_add_safe+0xea/0x150
[   53.088211]  [<ffffffff8129a600>] ? SyS_alarm+0x20/0x20
[   53.093564]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   53.099342]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   53.108514]  [<ffffffff812d1ee4>] ? SyS_futex+0x284/0x300
[   53.114220]  [<ffffffff812d1e50>] SyS_futex+0x1f0/0x300
[   53.119835]  [<ffffffff812d1c60>] ? do_futex+0x1770/0x1770
[   53.125535]  [<ffffffff838bf318>] ? retint_user+0x18/0x3c
[   53.131056]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   53.137617]  [<ffffffff838be765>] entry_SYSCALL_64_fastpath+0x22/0x9e
executing program
[   53.144172] 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 
[   53.171213] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   53.177217]  RSP <ffff8800bb38f7d8>
[   53.181303] ---[ end trace 5f20fc735768cac0 ]---
[   53.187089] Kernel panic - not syncing: Fatal exception
[   53.193222] Dumping ftrace buffer:
[   53.196753]    (ftrace buffer empty)
[   53.200441] Kernel Offset: disabled
[   53.204132] Rebooting in 86400 seconds..