[....] 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[   22.591064] 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: [   25.532899] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   25.862703] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   26.963750] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts.
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[   33.012299] page:ffffea0002b90000 count:2 mapcount:0 mapping:          (null) index:0x0
[   33.024555] flags: 0x4000000000004004(referenced|head)
[   33.031685] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   33.038610] ------------[ cut here ]------------
[   33.043362] kernel BUG at mm/filemap.c:819!
[   33.047662] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   33.053499] Dumping ftrace buffer:
[   33.057013]    (ftrace buffer empty)
[   33.060703] Modules linked in:
[   33.064008] CPU: 1 PID: 3768 Comm: syz-executor564 Not tainted 4.4.129-g23eaecc #27
[   33.071782] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.081115] task: ffff8801cb5cb000 task.stack: ffff8800b01a8000
[   33.087149] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   33.095487] RSP: 0018:ffff8800b01af7d8  EFLAGS: 00010293
[   33.100912] RAX: ffffffff83a6e7c0 RBX: ffffea0002b90000 RCX: 0000000000000000
[   33.108161] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8801cb5cb8dc
[   33.115414] RBP: ffff8800b01af7f8 R08: 0000000000000001 R09: 0000000000000000
[   33.122684] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   33.129932] R13: ffff8800b01afaa8 R14: ffffea0002b91480 R15: ffffea0002b90008
[   33.137182] FS:  00007f8a571c8700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   33.145388] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.151245] CR2: 00000000204a4ff0 CR3: 00000000afe8a000 CR4: 00000000001606f0
[   33.158494] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.165744] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.172988] Stack:
[   33.175114]  ffffea0002b90000 dffffc0000000000 ffff8800b01afaa8 ffffea0002b91480
[   33.183120]  ffff8800b01af8e0 ffffffff812cc1bc 0000000000000001 ffff8800b01af890
[   33.191116]  0000000000000046 ffff8800b0071900 00000000cb5cb8d8 ffff8800b01afab8
[   33.199121] Call Trace:
[   33.201697]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   33.207387]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   33.213859]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   33.220763]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   33.226627]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   33.232229]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   33.238176]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   33.243603]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   33.249726]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   33.255847]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   33.261191]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   33.267317]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   33.273357]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   33.280178]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   33.286038]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   33.291384]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   33.297168]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   33.303381]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   33.308900]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   33.314240]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   33.319860]  [<ffffffff838bfc98>] ? retint_user+0x18/0x3c
[   33.325393]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   33.331949]  [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
executing program
[   33.338501] 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 
[   33.365572] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   33.371565]  RSP <ffff8800b01af7d8>
[   33.375614] ---[ end trace 7d748a6e5cbad2c7 ]---
[   33.380831] Kernel panic - not syncing: Fatal exception
[   33.386674] Dumping ftrace buffer:
[   33.390199]    (ftrace buffer empty)
[   33.393886] Kernel Offset: disabled
[   33.397489] Rebooting in 86400 seconds..