[....] 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[   20.463236] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.
[   20.649245] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[   20.998537] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.056520] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts.
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[   27.845299] page:ffffea0002dc8000 count:2 mapcount:0 mapping:          (null) index:0x0
[   27.861727] flags: 0x4000000000004004(referenced|head)
[   27.867624] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   27.874535] ------------[ cut here ]------------
[   27.879275] kernel BUG at mm/filemap.c:819!
[   27.883569] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   27.889408] Dumping ftrace buffer:
[   27.892918]    (ftrace buffer empty)
[   27.896604] Modules linked in:
[   27.899895] CPU: 1 PID: 3773 Comm: syz-executor976 Not tainted 4.4.129-g23eaecc #26
[   27.907659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.916984] task: ffff8800b02e4800 task.stack: ffff8801cab00000
[   27.923012] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   27.931336] RSP: 0018:ffff8801cab07760  EFLAGS: 00010293
[   27.936760] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000
[   27.944002] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8800b02e50dc
[   27.951243] RBP: ffff8801cab07780 R08: 0000000000000001 R09: 0000000000000000
[   27.958485] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   27.965727] R13: ffff8801cab07a30 R14: ffffea0002dc9480 R15: ffffea0002dc8008
[   27.972971] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77a7b40
[   27.981167] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   27.987019] CR2: 00000000204a4ff0 CR3: 00000001d0250000 CR4: 00000000001606f0
[   27.994265] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.001510] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.008919] Stack:
[   28.011039]  ffffea0002dc8000 dffffc0000000000 ffff8801cab07a30 ffffea0002dc9480
[   28.019015]  ffff8801cab07868 ffffffff812cc1bc 0000000000000001 ffff8801cab07818
[   28.027005]  0000000000000046 ffff8801ca9b0a00 00000000b02e50d8 ffff8801cab07a40
[   28.034986] Call Trace:
[   28.037549]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   28.043230]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   28.049695]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   28.056595]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   28.062458]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   28.068052]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   28.073993]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   28.079413]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   28.085531]  [<ffffffff810cc640>] ? native_set_pte_at+0xe0/0xe0
[   28.091563]  [<ffffffff81508bdd>] ? do_huge_pmd_anonymous_page+0x52d/0x9d0
[   28.098547]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   28.104665]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   28.110000]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   28.116114]  [<ffffffff838bfce9>] ? retint_kernel+0x2d/0x2d
[   28.121798]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   28.128611]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   28.134465]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   28.139809]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   28.145580]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   28.151785]  [<ffffffff812d281d>] ? compat_SyS_futex+0x26d/0x2f0
[   28.157901]  [<ffffffff812d2789>] compat_SyS_futex+0x1d9/0x2f0
[   28.163846]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   28.170831]  [<ffffffff810d724e>] ? __bad_area_nosemaphore+0x21e/0x310
[   28.177468]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   28.183671]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   28.190654]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   28.196770]  [<ffffffff838c0a2a>] sysenter_flags_fixed+0xd/0x17
[   28.202802] 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 
[   28.229592] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   28.235568]  RSP <ffff8801cab07760>
[   28.239550] ---[ end trace 493cca2c7e45ccf8 ]---
[   28.244572] Kernel panic - not syncing: Fatal exception
[   28.250396] Dumping ftrace buffer:
[   28.253915]    (ftrace buffer empty)
[   28.257688] Kernel Offset: disabled
[   28.261286] Rebooting in 86400 seconds..