[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.930436] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.
[   22.163670] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[   22.564172] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.754545] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available)
[   23.927383] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available)
Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts.
[   29.411709] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available)
executing program
[   29.508535] page:ffffea000731ec00 count:4 mapcount:1 mapping:          (null) index:0x0
[   29.516907] flags: 0x8000000000004010(dirty|head)
[   29.522080] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   29.528421] ------------[ cut here ]------------
[   29.533163] kernel BUG at mm/filemap.c:819!
[   29.537495] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   29.543307] Dumping ftrace buffer:
[   29.546819]    (ftrace buffer empty)
[   29.550503] Modules linked in:
[   29.553786] CPU: 0 PID: 3731 Comm: syz-executor586 Not tainted 4.4.129-g23eaecc #27
[   29.561555] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.570888] task: ffff8801cd904800 task.stack: ffff8800b7750000
[   29.577003] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   29.585362] RSP: 0018:ffff8800b77578b0  EFLAGS: 00010293
[   29.590785] RAX: ffffffff83a6e7c0 RBX: ffffea000731ec00 RCX: 0000000000000000
[   29.598118] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8801cd9050dc
[   29.605362] RBP: ffff8800b77578d0 R08: 0000000000000001 R09: 0000000000000000
[   29.612605] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   29.619850] R13: ffff8800b7757b30 R14: ffffea000731ec40 R15: ffffea000731ec08
[   29.627134] FS:  00000000024fb880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   29.635334] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.641191] CR2: 000000002029a000 CR3: 00000000b5898000 CR4: 00000000001606f0
[   29.648437] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   29.655682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   29.662925] Stack:
[   29.665047]  ffffea000731ec00 dffffc0000000000 ffff8800b7757b30 ffffea000731ec40
[   29.673040]  ffff8800b77579b8 ffffffff812cc1bc ffffffff84c518e0 ffff8801db207fc0
[   29.681414]  ffff8801cd904800 ffff8800b0928a00 0000000081015dc4 ffff8800b7757b40
[   29.690479] Call Trace:
[   29.693185]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   29.698874]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   29.705343]  [<ffffffff812cdc2c>] futex_requeue+0x20c/0x1690
[   29.711866]  [<ffffffff81231a10>] ? __lock_acquire+0x2c00/0x5270
[   29.718154]  [<ffffffff812cda20>] ? futex_lock_pi+0x600/0x600
[   29.725827]  [<ffffffff8122ee10>] ? debug_check_no_locks_freed+0x210/0x210
[   29.733030]  [<ffffffff812d0712>] do_futex+0x202/0x1770
[   29.739159]  [<ffffffff8128cec1>] ? timespec_trunc+0xc1/0x160
[   29.745283]  [<ffffffff8128ce00>] ? SYSC_adjtimex+0x130/0x130
[   29.751166]  [<ffffffff812af794>] ? current_kernel_time64+0x104/0x120
[   29.757719]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   29.763840]  [<ffffffff8128cfac>] ? current_fs_time+0x4c/0x70
[   29.769699]  [<ffffffff810cc560>] ? native_set_pud+0x40/0x40
[   29.775474]  [<ffffffff8156fcd1>] ? file_update_time+0xc1/0x3c0
[   29.781514]  [<ffffffff81219e40>] ? __wake_up_sync+0x10/0x10
[   29.787293]  [<ffffffff8156fc10>] ? should_remove_suid+0xe0/0xe0
[   29.793416]  [<ffffffff8149b122>] ? handle_mm_fault+0x902/0x30b0
[   29.799671]  [<ffffffff8149b417>] ? handle_mm_fault+0xbf7/0x30b0
[   29.805794]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   29.811133]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   29.816734]  [<ffffffff838bfc98>] ? retint_user+0x18/0x3c
[   29.822248]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   29.829063]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   29.835695]  [<ffffffff838bf0e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   29.842243] 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 
[   29.869009] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   29.874999]  RSP <ffff8800b77578b0>
[   29.879112] ---[ end trace 8ef00f03babf692d ]---
[   29.883854] Kernel panic - not syncing: Fatal exception
[   29.889877] Dumping ftrace buffer:
[   29.893398]    (ftrace buffer empty)
[   29.897081] Kernel Offset: disabled
[   29.900682] Rebooting in 86400 seconds..