[....] 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[   21.585134] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.244026] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   26.463704] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   27.471566] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts.
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[   51.749396] page:ffffea0002dc8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   51.764223] flags: 0x4000000000004004(referenced|head)
[   51.770049] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   51.776401] ------------[ cut here ]------------
[   51.781140] kernel BUG at mm/filemap.c:819!
[   51.785963] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   51.791811] Dumping ftrace buffer:
[   51.795334]    (ftrace buffer empty)
[   51.799017] Modules linked in:
[   51.802304] CPU: 0 PID: 3859 Comm: syz-executor914 Not tainted 4.4.131-gfcce571 #35
[   51.810416] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   51.819747] task: ffff8801d91d6000 task.stack: ffff8801d9140000
[   51.825786] RIP: 0010:[<ffffffff8141de15>]  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   51.834123] RSP: 0018:ffff8801d9147760  EFLAGS: 00010293
[   51.839546] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000
[   51.846790] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801d91d68dc
[   51.854037] RBP: ffff8801d9147780 R08: 0000000000000001 R09: 0000000000000000
[   51.861295] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   51.868540] R13: ffff8801d9147a30 R14: ffffea0002dc9480 R15: ffffea0002dc8008
[   51.875793] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77c0b40
[   51.883993] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   51.889856] CR2: 0000000020196000 CR3: 00000001d02da000 CR4: 00000000001606f0
[   51.897113] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   51.904361] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   51.911613] Stack:
[   51.913732]  ffffea0002dc8000 dffffc0000000000 ffff8801d9147a30 ffffea0002dc9480
[   51.921728]  ffff8801d9147868 ffffffff812cc1bc 0000000000000001 ffff8801d9147818
[   51.929706]  0000000000000046 ffff8801cdb4c000 00000000d91d68d8 ffff8801d9147a40
[   51.937713] Call Trace:
[   51.940282]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   51.945964]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   51.952433]  [<ffffffff838bf2a5>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   51.959333]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   51.965197]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   51.970806]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   51.976751]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   51.982175]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   51.988296]  [<ffffffff810cc640>] ? native_set_pte_at+0xe0/0xe0
[   51.994330]  [<ffffffff81508a8d>] ? do_huge_pmd_anonymous_page+0x52d/0x9d0
[   52.001318]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   52.007451]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   52.013048]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   52.019168]  [<ffffffff838c0929>] ? retint_kernel+0x2d/0x2d
[   52.024854]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   52.031670]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   52.037527]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   52.042954]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   52.048723]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   52.054928]  [<ffffffff812d281d>] ? compat_SyS_futex+0x26d/0x2f0
[   52.061045]  [<ffffffff812d2789>] compat_SyS_futex+0x1d9/0x2f0
[   52.066991]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   52.073997]  [<ffffffff810d724e>] ? __bad_area_nosemaphore+0x21e/0x310
[   52.080640]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   52.086858]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   52.093848]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   52.099972]  [<ffffffff838c166a>] sysenter_flags_fixed+0xd/0x17
[   52.105999] 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 
[   52.132846] RIP  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   52.138844]  RSP <ffff8801d9147760>
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[   52.148807] ---[ end trace 6cb0b98c624418df ]---
[   52.153586] Kernel panic - not syncing: Fatal exception
[   52.159445] Dumping ftrace buffer:
[   52.159448]    (ftrace buffer empty)
[   52.159450] Kernel Offset: disabled
[   52.170251] Rebooting in 86400 seconds..