[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.460662] 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: [   22.882692] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[   23.135776] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[   24.225213] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available)
[   28.761908] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available)
Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts.
[   34.311441] random: nonblocking pool is initialized
executing program
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[   34.427409] page:ffffea0007248000 count:2 mapcount:0 mapping:          (null) index:0x0
[   34.437654] flags: 0x8000000000004004(referenced|head)
[   34.444001] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   34.450768] ------------[ cut here ]------------
[   34.455525] kernel BUG at mm/filemap.c:819!
[   34.459828] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   34.465695] Dumping ftrace buffer:
[   34.469213]    (ftrace buffer empty)
[   34.472911] Modules linked in:
[   34.476222] CPU: 1 PID: 3819 Comm: syz-executor176 Not tainted 4.4.131-g6ec0e3f #35
[   34.484006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.493370] task: ffff8801d982e000 task.stack: ffff8800bba60000
[   34.499409] RIP: 0010:[<ffffffff8141de15>]  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   34.507776] RSP: 0018:ffff8800bba677d8  EFLAGS: 00010293
[   34.513198] RAX: ffffffff83a6e7c0 RBX: ffffea0007248000 RCX: 0000000000000000
[   34.520444] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801d982e8dc
[   34.527691] RBP: ffff8800bba677f8 R08: 0000000000000001 R09: 0000000000000000
[   34.534944] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   34.542195] R13: ffff8800bba67aa8 R14: ffffea0007249480 R15: ffffea0007248008
[   34.549443] FS:  00007f7147411700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   34.557648] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   34.563520] CR2: 00000000204a4ff0 CR3: 00000001ce294000 CR4: 00000000001606f0
[   34.570777] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   34.578026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   34.585272] Stack:
[   34.587398]  ffffea0007248000 dffffc0000000000 ffff8800bba67aa8 ffffea0007249480
[   34.595412]  ffff8800bba678e0 ffffffff812cc1bc 0000000000000001 ffff8800bba67890
[   34.603424]  0000000000000046 ffff8801da39c000 00000000d982e8d8 ffff8800bba67ab8
[   34.611421] Call Trace:
[   34.613994]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   34.619685]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   34.626158]  [<ffffffff838bf2a5>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   34.633061]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   34.638927]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   34.644531]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   34.650479]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   34.655909]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   34.662046]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   34.668174]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   34.673517]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   34.679647]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   34.685691]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   34.692514]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   34.698385]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   34.703731]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   34.709509]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   34.715717]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   34.721229]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   34.726582]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   34.732277]  [<ffffffff838c08d8>] ? retint_user+0x18/0x3c
[   34.737794]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   34.744352]  [<ffffffff838bfd25>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   34.750910] 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 
[   34.777928] RIP  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   34.783918]  RSP <ffff8800bba677d8>
[   34.788286] ---[ end trace 0dfb43e60b3996db ]---
[   34.793506] Kernel panic - not syncing: Fatal exception
[   34.799324] Dumping ftrace buffer:
[   34.802857]    (ftrace buffer empty)
[   34.806559] Kernel Offset: disabled
[   34.810167] Rebooting in 86400 seconds..