[....] 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[   22.275129] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.020394] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   24.431633] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   25.450897] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts.
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[   36.092095] page:ffffea00071e8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   36.108003] flags: 0x8000000000004004(referenced|head)
[   36.114265] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   36.120572] ------------[ cut here ]------------
[   36.125302] kernel BUG at mm/filemap.c:819!
[   36.129599] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   36.135441] Dumping ftrace buffer:
[   36.138954]    (ftrace buffer empty)
[   36.142644] Modules linked in:
[   36.145935] CPU: 1 PID: 3843 Comm: syz-executor947 Not tainted 4.4.128-gbd23e3a #19
[   36.153703] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   36.163031] task: ffff8800b6c4c800 task.stack: ffff8801d9938000
[   36.169061] RIP: 0010:[<ffffffff8141df45>]  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   36.177392] RSP: 0018:ffff8801d993f760  EFLAGS: 00010293
[   36.182814] RAX: ffffffff83a6e7c0 RBX: ffffea00071e8000 RCX: 0000000000000000
[   36.190058] RDX: 0000000000000000 RSI: ffffffff815130e9 RDI: ffff8800b6c4d0dc
[   36.197301] RBP: ffff8801d993f780 R08: 0000000000000001 R09: 0000000000000000
[   36.204544] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   36.211791] R13: ffff8801d993fa30 R14: ffffea00071e9480 R15: ffffea00071e8008
[   36.219038] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7754b40
[   36.227237] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   36.233092] CR2: 00000000204a4ff0 CR3: 00000001d9438000 CR4: 0000000000160670
[   36.240337] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.247581] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.254822] Stack:
[   36.256944]  ffffea00071e8000 dffffc0000000000 ffff8801d993fa30 ffffea00071e9480
[   36.264935]  ffff8801d993f868 ffffffff812cc19c 0000000000000001 ffff8801d993f818
[   36.272923]  0000000000000046 ffff8801cf317700 00000000b6c4d0d8 ffff8801d993fa40
[   36.280912] Call Trace:
[   36.283477]  [<ffffffff812cc19c>] get_futex_key+0xadc/0xd80
[   36.289161]  [<ffffffff812cb6c0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   36.295628]  [<ffffffff838bdd15>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   36.302527]  [<ffffffff812cc979>] futex_wait_setup+0xd9/0x330
[   36.308384]  [<ffffffff812cc8a0>] ? futex_wake+0x460/0x460
[   36.313983]  [<ffffffff8129d123>] ? __hrtimer_init+0x143/0x1e0
[   36.319927]  [<ffffffff812cce7f>] futex_wait+0x2af/0x600
[   36.325352]  [<ffffffff812ccbd0>] ? futex_wait_setup+0x330/0x330
[   36.331474]  [<ffffffff810cc640>] ? native_set_pte_at+0xe0/0xe0
[   36.337509]  [<ffffffff8150892d>] ? do_huge_pmd_anonymous_page+0x52d/0x9d0
[   36.344497]  [<ffffffff8129b480>] ? clock_was_set_work+0x30/0x30
[   36.350616]  [<ffffffff812d0792>] do_futex+0x2a2/0x1770
[   36.355953]  [<ffffffff812d04f0>] ? exit_robust_list+0x220/0x220
[   36.362071]  [<ffffffff838bf369>] ? retint_kernel+0x2d/0x2d
[   36.367758]  [<ffffffff8122e67b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   36.374571]  [<ffffffff8129a6ea>] ? ktime_add_safe+0xea/0x150
[   36.380428]  [<ffffffff8129a600>] ? SyS_alarm+0x20/0x20
[   36.385764]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   36.391534]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   36.397739]  [<ffffffff812d27fd>] ? compat_SyS_futex+0x26d/0x2f0
[   36.403857]  [<ffffffff812d2769>] compat_SyS_futex+0x1d9/0x2f0
[   36.409807]  [<ffffffff812d2590>] ? compat_SyS_get_robust_list+0x310/0x310
[   36.416794]  [<ffffffff810d724e>] ? __bad_area_nosemaphore+0x21e/0x310
[   36.423437]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   36.429643]  [<ffffffff812d2590>] ? compat_SyS_get_robust_list+0x310/0x310
[   36.436628]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   36.442747]  [<ffffffff838c00aa>] sysenter_flags_fixed+0xd/0x17
[   36.448775] 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 
[   36.475691] RIP  [<ffffffff8141df45>] unlock_page+0x115/0x150
[   36.481672]  RSP <ffff8801d993f760>
[   36.485486] ---[ end trace e0294567e29ddfd6 ]---
[   36.490603] Kernel panic - not syncing: Fatal exception
[   36.496424] Dumping ftrace buffer:
[   36.499946]    (ftrace buffer empty)
[   36.503628] Kernel Offset: disabled
[   36.507225] Rebooting in 86400 seconds..