[....] 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[   20.677324] 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: [   23.463140] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   23.814597] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   24.868857] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts.
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[   30.631952] page:ffffea0002dc8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   30.646323] flags: 0x4000000000004004(referenced|head)
[   30.652609] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   30.658915] ------------[ cut here ]------------
[   30.663648] kernel BUG at mm/filemap.c:819!
[   30.667960] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   30.673803] Dumping ftrace buffer:
[   30.677317]    (ftrace buffer empty)
[   30.681004] Modules linked in:
[   30.684297] CPU: 0 PID: 3683 Comm: syz-executor771 Not tainted 4.4.131-g834913c #31
[   30.692063] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.701393] task: ffff8800b2d63000 task.stack: ffff8800b6280000
[   30.707424] RIP: 0010:[<ffffffff8141df55>]  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   30.715759] RSP: 0018:ffff8800b62877d8  EFLAGS: 00010293
[   30.721180] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000
[   30.728425] RDX: 0000000000000000 RSI: ffffffff81513389 RDI: ffff8800b2d638dc
[   30.735668] RBP: ffff8800b62877f8 R08: 0000000000000001 R09: 0000000000000000
[   30.742913] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   30.750156] R13: ffff8800b6287aa8 R14: ffffea0002dc9480 R15: ffffea0002dc8008
[   30.757400] FS:  00007fe95c65b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   30.765600] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.771457] CR2: 00007fe95c639db8 CR3: 00000000b2a11000 CR4: 00000000001606f0
[   30.778710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   30.785956] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   30.793196] Stack:
[   30.795320]  ffffea0002dc8000 dffffc0000000000 ffff8800b6287aa8 ffffea0002dc9480
[   30.803306]  ffff8800b62878e0 ffffffff812cc1bc 0000000000000001 ffff8800b6287890
[   30.811293]  0000000000000046 ffff8801cf680a00 00000000b2d638d8 ffff8800b6287ab8
[   30.819290] Call Trace:
[   30.821859]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   30.827543]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   30.834011]  [<ffffffff838bf3d5>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   30.840913]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   30.846781]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   30.852380]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   30.858325]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   30.863749]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   30.869870]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   30.875990]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   30.881328]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   30.887447]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   30.893480]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   30.900290]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   30.906145]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   30.911482]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   30.917251]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   30.923456]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   30.928969]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   30.934306]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   30.939919]  [<ffffffff838c09d8>] ? retint_user+0x18/0x3c
[   30.945436]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   30.951994]  [<ffffffff838bfe25>] entry_SYSCALL_64_fastpath+0x22/0x9e
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[   30.958544] 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 
[   30.985479] RIP  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   30.991464]  RSP <ffff8800b62877d8>
[   31.010975] ---[ end trace 960ef077507421b9 ]---
[   31.016083] Kernel panic - not syncing: Fatal exception
[   31.021939] Dumping ftrace buffer:
[   31.021943]    (ftrace buffer empty)
[   31.021946] Kernel Offset: disabled
[   31.032744] Rebooting in 86400 seconds..