[....] 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[   22.013048] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.141199] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available)
[   26.569938] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   27.591593] random: nonblocking pool is initialized
Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts.
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[   33.403567] page:ffffea0007198000 count:2 mapcount:0 mapping:          (null) index:0x0
[   33.416624] flags: 0x8000000000004004(referenced|head)
[   33.422446] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   33.428890] ------------[ cut here ]------------
[   33.433632] kernel BUG at mm/filemap.c:819!
[   33.437927] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   33.443756] Dumping ftrace buffer:
[   33.447272]    (ftrace buffer empty)
[   33.451073] Modules linked in:
[   33.454357] CPU: 0 PID: 3857 Comm: syz-executor894 Not tainted 4.4.131-g4fca5a0 #33
[   33.462122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.471453] task: ffff8800abf1c800 task.stack: ffff8800abe68000
[   33.477485] RIP: 0010:[<ffffffff8141df55>]  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   33.485818] RSP: 0018:ffff8800abe6f7d8  EFLAGS: 00010293
[   33.491241] RAX: ffffffff83a6e7c0 RBX: ffffea0007198000 RCX: 0000000000000000
[   33.498484] RDX: 0000000000000000 RSI: ffffffff81513389 RDI: ffff8800abf1d0dc
[   33.505734] RBP: ffff8800abe6f7f8 R08: 0000000000000001 R09: 0000000000000000
[   33.512976] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   33.520230] R13: ffff8800abe6faa8 R14: ffffea0007199480 R15: ffffea0007198008
[   33.527476] FS:  00007feb3e954700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   33.535676] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.541530] CR2: 0000000020196000 CR3: 00000000b389b000 CR4: 00000000001606f0
[   33.548785] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.556031] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.563275] Stack:
[   33.565398]  ffffea0007198000 dffffc0000000000 ffff8800abe6faa8 ffffea0007199480
[   33.573399]  ffff8800abe6f8e0 ffffffff812cc1bc 0000000000000001 ffff8800abe6f890
[   33.581677]  0000000000000046 ffff8800bbbd1900 00000000abf1d0d8 ffff8800abe6fab8
[   33.589768] Call Trace:
[   33.592335]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   33.598020]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   33.604505]  [<ffffffff838bf3b5>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   33.611406]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   33.617264]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   33.622862]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   33.628815]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   33.634239]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   33.640357]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   33.646479]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   33.651835]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   33.657957]  [<ffffffff810d7ac5>] ? __do_page_fault+0x385/0xa10
[   33.663994]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   33.670805]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   33.676663]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   33.682016]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   33.687789]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   33.693998]  [<ffffffff812d1f04>] ? SyS_futex+0x284/0x300
[   33.699511]  [<ffffffff812d1e70>] SyS_futex+0x1f0/0x300
[   33.704849]  [<ffffffff812d1c80>] ? do_futex+0x1770/0x1770
[   33.710446]  [<ffffffff838c09d8>] ? retint_user+0x18/0x3c
[   33.715958]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   33.722511]  [<ffffffff838bfe25>] entry_SYSCALL_64_fastpath+0x22/0x9e
executing program
[   33.729060] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 08 bf df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 9a 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 
[   33.756096] RIP  [<ffffffff8141df55>] unlock_page+0x115/0x150
[   33.762075]  RSP <ffff8800abe6f7d8>
[   33.766491] ---[ end trace 9b294467f9241f00 ]---
[   33.771256] Kernel panic - not syncing: Fatal exception
[   33.777147] Dumping ftrace buffer:
[   33.780662]    (ftrace buffer empty)
[   33.784346] Kernel Offset: disabled
[   33.787944] Rebooting in 86400 seconds..