[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.084648] 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: [   24.650769] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   24.985245] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   26.010470] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available)
[   26.173810] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available)
Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts.
[   31.687101] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available)
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[   31.782378] page:ffffea0002dc0000 count:2 mapcount:0 mapping:          (null) index:0x0
[   31.798364] flags: 0x4000000000004004(referenced|head)
[   31.804878] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   31.811392] ------------[ cut here ]------------
[   31.816131] kernel BUG at mm/filemap.c:819!
[   31.820439] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   31.826269] Dumping ftrace buffer:
[   31.829789]    (ftrace buffer empty)
[   31.833475] Modules linked in:
[   31.836768] CPU: 1 PID: 3817 Comm: syz-executor313 Not tainted 4.4.129-g23eaecc #27
[   31.844534] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.853867] task: ffff8800b61a4800 task.stack: ffff8801c8d18000
[   31.859899] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   31.868231] RSP: 0018:ffff8801c8d1f7d8  EFLAGS: 00010293
[   31.873653] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc0000 RCX: 0000000000000000
[   31.880898] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8800b61a50dc
[   31.888145] RBP: ffff8801c8d1f7f8 R08: 0000000000000001 R09: 0000000000000000
[   31.895393] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   31.902637] R13: ffff8801c8d1faa8 R14: ffffea0002dc1480 R15: ffffea0002dc0008
[   31.909884] FS:  00007fb2617f9700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   31.918086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.923940] CR2: 00007fb2617d7db8 CR3: 00000001d0d92000 CR4: 00000000001606f0
[   31.931189] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.938608] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.945851] Stack:
[   31.947974]  ffffea0002dc0000 dffffc0000000000 ffff8801c8d1faa8 ffffea0002dc1480
[   31.955969]  ffff8801c8d1f8e0 ffffffff812cc1bc 0000000000000001 ffff8801c8d1f890
[   31.963967]  0000000000000046 ffff8800b392b200 00000000b61a50d8 ffff8801c8d1fab8
[   31.971965] Call Trace:
[   31.974533]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   31.980221]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   31.986689]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   31.993599]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   31.999467]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   32.005068]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   32.011014]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   32.016438]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   32.022558]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   32.028677]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   32.034014]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   32.040140]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   32.046176]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   32.052988]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   32.058846]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   32.064186]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   32.069958]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   32.076336]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   32.081847]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   32.087185]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   32.092784]  [<ffffffff838bfc98>] ? retint_user+0x18/0x3c
[   32.098298]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   32.104853]  [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   32.111402] 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 f1 b1 0d 00 e9 0a ff ff ff e8 e7 b1 0d 00 e9 
[   32.138782] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   32.144771]  RSP <ffff8801c8d1f7d8>
[   32.148615] ---[ end trace dd102227592a5d6e ]---
[   32.154045] Kernel panic - not syncing: Fatal exception
[   32.159883] Dumping ftrace buffer:
[   32.163411]    (ftrace buffer empty)
[   32.167093] Kernel Offset: disabled
[   32.170691] Rebooting in 86400 seconds..