[....] 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[   21.661330] 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: [   25.559001] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   25.919702] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   26.995459] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts.
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[   33.717543] page:ffffea00071a8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   33.725774] flags: 0x8000000000004004(referenced|head)
[   33.731519] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   33.738133] ------------[ cut here ]------------
[   33.742872] kernel BUG at mm/filemap.c:819!
[   33.747187] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   33.753007] Dumping ftrace buffer:
[   33.756518]    (ftrace buffer empty)
[   33.760203] Modules linked in:
[   33.763494] CPU: 0 PID: 3841 Comm: syz-executor583 Not tainted 4.4.131-g3702e76 #38
[   33.771257] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.780586] task: ffff8800ac074800 task.stack: ffff8800bb8e0000
[   33.786614] RIP: 0010:[<ffffffff8141de15>]  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   33.794943] RSP: 0018:ffff8800bb8e77d8  EFLAGS: 00010293
[   33.800364] RAX: ffffffff83a6e7c0 RBX: ffffea00071a8000 RCX: 0000000000000000
[   33.807607] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8800ac0750dc
[   33.814851] RBP: ffff8800bb8e77f8 R08: 0000000000000001 R09: 0000000000000000
[   33.822107] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   33.829350] R13: ffff8800bb8e7aa8 R14: ffffea00071a9480 R15: ffffea00071a8008
[   33.836594] FS:  00007fe177dfb700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   33.844793] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.850647] CR2: 00000000204a4ff0 CR3: 00000000ae4a8000 CR4: 00000000001606f0
[   33.857892] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.865137] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.872377] Stack:
[   33.874500]  ffffea00071a8000 dffffc0000000000 ffff8800bb8e7aa8 ffffea00071a9480
[   33.882488]  ffff8800bb8e78e0 ffffffff812cc1bc 0000000000000001 ffff8800bb8e7890
[   33.890475]  0000000000000046 ffff8800b093d400 00000000ac0750d8 ffff8800bb8e7ab8
[   33.898465] Call Trace:
[   33.901031]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   33.906716]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   33.913182]  [<ffffffff838bf305>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   33.920082]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   33.925939]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   33.931538]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   33.937481]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   33.942903]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   33.949020]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   33.955137]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   33.960474]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   33.966593]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   33.972625]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   33.979437]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   33.985294]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   33.990642]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   33.996412]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   34.002618]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   34.008128]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   34.013466]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   34.019063]  [<ffffffff838c0918>] ? retint_user+0x18/0x3c
[   34.024574]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   34.031136]  [<ffffffff838bfd65>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   34.037683] 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 
executing program
[   34.064549] RIP  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   34.070526]  RSP <ffff8800bb8e77d8>
[   34.074822] ---[ end trace 7ede212255b20a51 ]---
[   34.079975] Kernel panic - not syncing: Fatal exception
[   34.085806] Dumping ftrace buffer:
[   34.089329]    (ftrace buffer empty)
[   34.093011] Kernel Offset: disabled
[   34.096607] Rebooting in 86400 seconds..