[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.643219] 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: [   25.854398] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   26.512289] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   27.604162] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available)
[   27.759724] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available)
[   31.279258] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts.
executing program
[   33.324466] page:ffffea000764ce00 count:4 mapcount:1 mapping:          (null) index:0x0
[   33.332857] flags: 0x8000000000004010(dirty|head)
[   33.338032] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   33.344371] ------------[ cut here ]------------
[   33.349108] kernel BUG at mm/filemap.c:819!
[   33.353403] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   33.359230] Dumping ftrace buffer:
[   33.362743]    (ftrace buffer empty)
[   33.366426] Modules linked in:
[   33.369711] CPU: 1 PID: 3848 Comm: syzkaller445926 Not tainted 4.4.128-ged3b23f #18
[   33.377477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.386803] task: ffff8801d2d28000 task.stack: ffff8801d98a8000
[   33.392851] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   33.401178] RSP: 0018:ffff8801d98af838  EFLAGS: 00010293
[   33.406598] RAX: ffffffff83a6e7c0 RBX: ffffea000764ce00 RCX: 0000000000000000
[   33.413842] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8801d2d288dc
[   33.421094] RBP: ffff8801d98af858 R08: 0000000000000001 R09: 0000000000000000
[   33.428338] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   33.435582] R13: ffff8801d98afab8 R14: ffffea000764ce40 R15: ffffea000764ce08
[   33.442832] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009503840
[   33.451030] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   33.456896] CR2: 000000002029a000 CR3: 00000001d9240000 CR4: 0000000000160670
[   33.464143] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.471388] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.478629] Stack:
[   33.480752]  ffffea000764ce00 dffffc0000000000 ffff8801d98afab8 ffffea000764ce40
[   33.488736]  ffff8801d98af940 ffffffff812cc19c 00000000ffeabb00 ffff8801d98af888
[   33.496713]  ffffffff812e8f6a ffff8800b1668f00 00000000d98af8a0 ffff8801d98afac8
[   33.504688] Call Trace:
[   33.507253]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   33.512937]  [<ffffffff812e8f6a>] ? is_module_text_address+0x2a/0x50
[   33.519401]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   33.525869]  [<ffffffff81015dc4>] ? dump_trace+0x184/0x360
[   33.531477]  [<ffffffff812cdc0c>] futex_requeue+0x20c/0x1690
[   33.537260]  [<ffffffff81229e20>] ? add_lock_to_list.isra.27.constprop.41+0x140/0x1c0
[   33.545200]  [<ffffffff812cda00>] ? futex_lock_pi+0x600/0x600
[   33.551057]  [<ffffffff812d06f2>] do_futex+0x202/0x1770
[   33.556396]  [<ffffffff8122e287>] ? mark_held_locks+0xc7/0x130
[   33.562340]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   33.568461]  [<ffffffff8128cde0>] ? SYSC_adjtimex+0x130/0x130
[   33.574319]  [<ffffffff812af774>] ? current_kernel_time64+0x104/0x120
[   33.580873]  [<ffffffff8128cf56>] ? current_fs_time+0x16/0x70
[   33.586728]  [<ffffffff8128cf8c>] ? current_fs_time+0x4c/0x70
[   33.592586]  [<ffffffff8156fa21>] ? file_update_time+0xc1/0x3c0
[   33.598617]  [<ffffffff81219e20>] ? __wake_up_sync+0x10/0x10
[   33.604396]  [<ffffffff8156f960>] ? should_remove_suid+0xe0/0xe0
[   33.610514]  [<ffffffff8149af32>] ? handle_mm_fault+0x902/0x2ff0
[   33.616641]  [<ffffffff8149b227>] ? handle_mm_fault+0xbf7/0x2ff0
[   33.622765]  [<ffffffff812d2769>] compat_SyS_futex+0x1d9/0x2f0
[   33.628711]  [<ffffffff812d2590>] ? compat_SyS_get_robust_list+0x310/0x310
[   33.636049]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   33.642261]  [<ffffffff812d2590>] ? compat_SyS_get_robust_list+0x310/0x310
[   33.649246]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   33.655365]  [<ffffffff838c00aa>] sysenter_flags_fixed+0xd/0x17
[   33.661393] 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 
[   33.688223] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   33.694207]  RSP <ffff8801d98af838>
[   33.698864] ---[ end trace eaf69739bdde8b55 ]---
[   33.703645] Kernel panic - not syncing: Fatal exception
[   33.709465] Dumping ftrace buffer:
[   33.712988]    (ftrace buffer empty)
[   33.716674] Kernel Offset: disabled
[   33.720279] Rebooting in 86400 seconds..