[....] 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[   21.265469] 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: [   25.290429] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   25.613448] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   26.618068] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts.
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[   32.608681] page:ffffea0002b18000 count:2 mapcount:0 mapping:          (null) index:0x0
[   32.623874] flags: 0x4000000000004004(referenced|head)
[   32.629577] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   32.636634] ------------[ cut here ]------------
[   32.641391] kernel BUG at mm/filemap.c:819!
[   32.645688] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   32.651511] Dumping ftrace buffer:
[   32.655026]    (ftrace buffer empty)
[   32.658714] Modules linked in:
[   32.662007] CPU: 0 PID: 3836 Comm: syz-executor054 Not tainted 4.4.130-g12ef385 #28
[   32.669775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.679106] task: ffff8801d916e000 task.stack: ffff8801c7e18000
[   32.685137] RIP: 0010:[<ffffffff8141df55>]  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   32.693470] RSP: 0018:ffff8801c7e1f7d8  EFLAGS: 00010293
[   32.698899] RAX: ffffffff83a6e7c0 RBX: ffffea0002b18000 RCX: 0000000000000000
[   32.706143] RDX: 0000000000000000 RSI: ffffffff81513389 RDI: ffff8801d916e8dc
[   32.713390] RBP: ffff8801c7e1f7f8 R08: 0000000000000001 R09: 0000000000000000
[   32.720634] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   32.727877] R13: ffff8801c7e1faa8 R14: ffffea0002b19480 R15: ffffea0002b18008
[   32.735124] FS:  00007f0fb9f61700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   32.743324] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.749182] CR2: 00000000204a4ff0 CR3: 00000001cd1e3000 CR4: 00000000001606f0
[   32.756432] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.763677] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.770918] Stack:
[   32.773038]  ffffea0002b18000 dffffc0000000000 ffff8801c7e1faa8 ffffea0002b19480
[   32.781029]  ffff8801c7e1f8e0 ffffffff812cc1bc 0000000000000001 ffff8801c7e1f890
[   32.789005]  0000000000000046 ffff8800ac90c000 00000000d916e8d8 ffff8801c7e1fab8
[   32.796992] Call Trace:
[   32.799559]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   32.805243]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   32.811719]  [<ffffffff838beaa5>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   32.818623]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   32.824485]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   32.830085]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   32.836035]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   32.841459]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   32.847588]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   32.855707]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   32.861043]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   32.867163]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   32.873197]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   32.880011]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   32.885868]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   32.891209]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   32.896983]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   32.903190]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   32.908709]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   32.914046]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   32.919644]  [<ffffffff838c00d8>] ? retint_user+0x18/0x3c
[   32.925168]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   32.931728]  [<ffffffff838bf525>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   32.938277] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 08 bf df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 9a 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 
[   32.965130] RIP  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   32.971112]  RSP <ffff8801c7e1f7d8>
[   32.975382] ---[ end trace f78da3b6850e45b7 ]---
[   32.980553] Kernel panic - not syncing: Fatal exception
[   32.986383] Dumping ftrace buffer:
[   32.989900]    (ftrace buffer empty)
[   32.993582] Kernel Offset: disabled
[   32.997177] Rebooting in 86400 seconds..