[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.553201] 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: [   23.379846] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   23.678319] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   24.760998] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available)
[   25.029073] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts.
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[   30.654792] page:ffffea00071e8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   30.668522] flags: 0x8000000000004004(referenced|head)
[   30.674201] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   30.681212] ------------[ cut here ]------------
[   30.685963] kernel BUG at mm/filemap.c:819!
[   30.690271] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   30.696098] Dumping ftrace buffer:
[   30.699611]    (ftrace buffer empty)
[   30.703296] Modules linked in:
[   30.706579] CPU: 1 PID: 3833 Comm: syz-executor322 Not tainted 4.4.129-g23eaecc #27
[   30.714341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.723669] task: ffff8800bb9c6000 task.stack: ffff8800b7738000
[   30.729696] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   30.738027] RSP: 0018:ffff8800b773f7d8  EFLAGS: 00010293
[   30.743447] RAX: ffffffff83a6e7c0 RBX: ffffea00071e8000 RCX: 0000000000000000
[   30.750689] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8800bb9c68dc
[   30.757933] RBP: ffff8800b773f7f8 R08: 0000000000000001 R09: 0000000000000000
[   30.765178] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   30.772423] R13: ffff8800b773faa8 R14: ffffea00071e9480 R15: ffffea00071e8008
[   30.779669] FS:  00007f7719253700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   30.787872] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.793724] CR2: 00000000204a4ff0 CR3: 00000000b3699000 CR4: 00000000001606f0
[   30.800974] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   30.808216] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   30.815458] Stack:
[   30.817576]  ffffea00071e8000 dffffc0000000000 ffff8800b773faa8 ffffea00071e9480
[   30.825561]  ffff8800b773f8e0 ffffffff812cc1bc 0000000000000001 ffff8800b773f890
[   30.833541]  0000000000000046 ffff8801c847ad00 00000000bb9c68d8 ffff8800b773fab8
[   30.841517] Call Trace:
[   30.844080]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   30.849761]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   30.856228]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   30.863124]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   30.868984]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   30.874585]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   30.880537]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   30.885967]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   30.892101]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   30.898222]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   30.903562]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   30.909682]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   30.915719]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   30.922536]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   30.929015]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   30.934353]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   30.940133]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   30.946341]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   30.951853]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   30.957191]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   30.962788]  [<ffffffff838bfc98>] ? retint_user+0x18/0x3c
[   30.968299]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   30.974853]  [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
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[   30.981402] 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 
[   31.008230] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   31.014212]  RSP <ffff8800b773f7d8>
[   31.026657] ---[ end trace 06c4a855d9ba0c4a ]---
[   31.034979] Kernel panic - not syncing: Fatal exception
[   31.040772] Dumping ftrace buffer:
[   31.040776]    (ftrace buffer empty)
[   31.040778] Kernel Offset: disabled
[   31.051572] Rebooting in 86400 seconds..