[....] 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[   21.299865] 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: [   24.025267] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   24.433741] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   25.433987] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts.
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[   31.428144] page:ffffea0002be0000 count:2 mapcount:0 mapping:          (null) index:0x0
[   31.440026] flags: 0x4000000000004004(referenced|head)
[   31.447363] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   31.453733] ------------[ cut here ]------------
[   31.458475] kernel BUG at mm/filemap.c:819!
[   31.462775] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   31.468615] Dumping ftrace buffer:
[   31.472142]    (ftrace buffer empty)
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[   31.475829] Modules linked in:
[   31.479116] CPU: 0 PID: 3723 Comm: syz-executor037 Not tainted 4.4.131-g3702e76 #37
[   31.486884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.496652] task: ffff8801ce1c4800 task.stack: ffff8801cd048000
[   31.502949] RIP: 0010:[<ffffffff8141de15>]  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   31.511284] RSP: 0018:ffff8801cd04f760  EFLAGS: 00010293
[   31.516707] RAX: ffffffff83a6e7c0 RBX: ffffea0002be0000 RCX: 0000000000000000
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[   31.523953] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801ce1c50dc
[   31.531204] RBP: ffff8801cd04f780 R08: 0000000000000001 R09: 0000000000000000
[   31.538458] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   31.545724] R13: ffff8801cd04fa30 R14: ffffea0002be1480 R15: ffffea0002be0008
[   31.553082] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f774fb40
[   31.553087] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   31.553090] CR2: 00000000f772edb0 CR3: 00000001d0b79000 CR4: 00000000001606f0
[   31.553100] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.553103] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.553105] Stack:
[   31.553114]  ffffea0002be0000 dffffc0000000000 ffff8801cd04fa30 ffffea0002be1480
[   31.553121]  ffff8801cd04f868 ffffffff812cc1bc 0000000000000001 ffff8801cd04f818
[   31.553129]  0000000000000046 ffff8800b1b67200 00000000ce1c50d8 ffff8801cd04fa40
[   31.553131] Call Trace:
[   31.553150]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   31.553158]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   31.553168]  [<ffffffff838bf305>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   31.553176]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   31.553182]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   31.553191]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   31.553198]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   31.553205]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   31.553215]  [<ffffffff810cc640>] ? native_set_pte_at+0xe0/0xe0
[   31.553225]  [<ffffffff81508a8d>] ? do_huge_pmd_anonymous_page+0x52d/0x9d0
[   31.553232]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   31.553239]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   31.553247]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   31.553254]  [<ffffffff838c0969>] ? retint_kernel+0x2d/0x2d
[   31.553263]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   31.553269]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   31.553275]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   31.553282]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   31.553289]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   31.553296]  [<ffffffff812d281d>] ? compat_SyS_futex+0x26d/0x2f0
[   31.553303]  [<ffffffff812d2789>] compat_SyS_futex+0x1d9/0x2f0
[   31.553311]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   31.553320]  [<ffffffff810d724e>] ? __bad_area_nosemaphore+0x21e/0x310
[   31.553329]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   31.553336]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   31.553342]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   31.553351]  [<ffffffff838c16aa>] sysenter_flags_fixed+0xd/0x17
[   31.553444] 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 
[   31.553453] RIP  [<ffffffff8141de15>] unlock_page+0x115/0x150
[   31.553455]  RSP <ffff8801cd04f760>
[   31.557203] ---[ end trace 8b94f9b67a566def ]---
[   31.557209] Kernel panic - not syncing: Fatal exception
[   31.562028] Dumping ftrace buffer:
[   31.562033]    (ftrace buffer empty)
[   31.562036] Kernel Offset: disabled
[   31.831223] Rebooting in 86400 seconds..