[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.879252] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.
[   22.897221] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.284192] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   24.354649] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available)
[   24.532479] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available)
[   25.257081] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts.
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[   30.279890] page:ffffea0007190000 count:2 mapcount:0 mapping:          (null) index:0x0
[   30.293315] flags: 0x8000000000004004(referenced|head)
[   30.299618] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   30.306092] ------------[ cut here ]------------
[   30.310840] kernel BUG at mm/filemap.c:819!
[   30.315187] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   30.321013] Dumping ftrace buffer:
[   30.324534]    (ftrace buffer empty)
[   30.328233] Modules linked in:
[   30.331528] CPU: 0 PID: 3843 Comm: syz-executor082 Not tainted 4.4.128-gbd23e3a #20
[   30.339298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.348638] task: ffff8800ac936000 task.stack: ffff8801d95d8000
[   30.354672] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   30.363010] RSP: 0018:ffff8801d95df7d8  EFLAGS: 00010293
[   30.368442] RAX: ffffffff83a6e7c0 RBX: ffffea0007190000 RCX: 0000000000000000
[   30.375693] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8800ac9368dc
[   30.383119] RBP: ffff8801d95df7f8 R08: 0000000000000001 R09: 0000000000000000
[   30.390371] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   30.397623] R13: ffff8801d95dfaa8 R14: ffffea0007191480 R15: ffffea0007190008
[   30.404881] FS:  00007f915c3f9700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   30.413088] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.418952] CR2: 00000000204a4ff0 CR3: 00000001ca764000 CR4: 0000000000160670
[   30.426207] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   30.433456] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   30.440706] Stack:
[   30.442832]  ffffea0007190000 dffffc0000000000 ffff8801d95dfaa8 ffffea0007191480
[   30.450827]  ffff8801d95df8e0 ffffffff812cc19c 0000000000000001 ffff8801d95df890
[   30.458841]  0000000000000046 ffff8801cb99d400 00000000ac9368d8 ffff8801d95dfab8
[   30.466827] Call Trace:
[   30.469399]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   30.475087]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   30.481566]  [<ffffffff838bdd15>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   30.488483]  [<ffffffff812cc979>] futex_wait_setup+0xd9/0x330
[   30.494440]  [<ffffffff812cc8a0>] ? futex_wake+0x460/0x460
[   30.500055]  [<ffffffff8129d123>] ? __hrtimer_init+0x143/0x1e0
[   30.506018]  [<ffffffff812cce7f>] futex_wait+0x2af/0x600
[   30.511460]  [<ffffffff812ccbd0>] ? futex_wait_setup+0x330/0x330
[   30.517586]  [<ffffffff8129b480>] ? clock_was_set_work+0x30/0x30
[   30.523716]  [<ffffffff812d0792>] do_futex+0x2a2/0x1770
[   30.529075]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   30.535200]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   30.541245]  [<ffffffff8122e67b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   30.548342]  [<ffffffff8129a6ea>] ? ktime_add_safe+0xea/0x150
[   30.554209]  [<ffffffff8129a600>] ? SyS_alarm+0x20/0x20
[   30.559638]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   30.565413]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   30.571627]  [<ffffffff812d1ee4>] ? SyS_futex+0x284/0x300
[   30.577142]  [<ffffffff812d1e50>] SyS_futex+0x1f0/0x300
[   30.582480]  [<ffffffff812d1c60>] ? do_futex+0x1770/0x1770
[   30.588092]  [<ffffffff838bf318>] ? retint_user+0x18/0x3c
[   30.593613]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   30.600172]  [<ffffffff838be765>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   30.606732] 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 61 af 0d 00 e9 0a ff ff ff e8 57 af 0d 00 e9 
[   30.633644] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   30.639650]  RSP <ffff8801d95df7d8>
[   30.643834] ---[ end trace 7957196d055dc726 ]---
[   30.649237] Kernel panic - not syncing: Fatal exception
[   30.655092] Dumping ftrace buffer:
[   30.658616]    (ftrace buffer empty)
[   30.662301] Kernel Offset: disabled
[   30.665903] Rebooting in 86400 seconds..