[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.759154] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.097306] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   25.325558] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   26.417966] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available)
[   30.367392] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts.
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[   51.503898] page:ffffea0007340000 count:2 mapcount:0 mapping:          (null) index:0x0
[   51.512055] flags: 0x8000000000004004(referenced|head)
[   51.517712] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
[   51.524105] ------------[ cut here ]------------
[   51.528833] kernel BUG at mm/filemap.c:819!
[   51.533122] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   51.538925] Dumping ftrace buffer:
[   51.542438]    (ftrace buffer empty)
[   51.546116] Modules linked in:
[   51.549391] CPU: 1 PID: 3680 Comm: syz-executor893 Not tainted 4.4.129-g23eaecc #26
[   51.557150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   51.566474] task: ffff8801cf383000 task.stack: ffff8801cf2c8000
[   51.572497] RIP: 0010:[<ffffffff8141df65>]  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   51.580813] RSP: 0018:ffff8801cf2cf760  EFLAGS: 00010293
[   51.586229] RAX: ffffffff83a6e7c0 RBX: ffffea0007340000 RCX: 0000000000000000
[   51.593467] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8801cf3838dc
[   51.600707] RBP: ffff8801cf2cf780 R08: 0000000000000001 R09: 0000000000000000
[   51.607946] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
[   51.615185] R13: ffff8801cf2cfa30 R14: ffffea0007341480 R15: ffffea0007340008
[   51.622424] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7711b40
[   51.630617] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   51.636468] CR2: 00000000204a4ff0 CR3: 00000000b2c6c000 CR4: 00000000001606f0
[   51.643710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   51.650948] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   51.658184] Stack:
[   51.660302]  ffffea0007340000 dffffc0000000000 ffff8801cf2cfa30 ffffea0007341480
[   51.668269]  ffff8801cf2cf868 ffffffff812cc1bc 0000000000000001 ffff8801cf2cf818
[   51.676233]  0000000000000046 ffff8801cf6ff700 00000000cf3838d8 ffff8801cf2cfa40
[   51.684217] Call Trace:
[   51.686777]  [<ffffffff812cc1bc>] get_futex_key+0xadc/0xd80
[   51.692459]  [<ffffffff812cb6e0>] ? futex_lock_pi_atomic+0x2b0/0x2b0
[   51.698924]  [<ffffffff838be695>] ? _raw_spin_unlock_irqrestore+0x45/0x70
[   51.705818]  [<ffffffff812cc999>] futex_wait_setup+0xd9/0x330
[   51.711669]  [<ffffffff812cc8c0>] ? futex_wake+0x460/0x460
[   51.717263]  [<ffffffff8129d143>] ? __hrtimer_init+0x143/0x1e0
[   51.723202]  [<ffffffff812cce9f>] futex_wait+0x2af/0x600
[   51.728620]  [<ffffffff812ccbf0>] ? futex_wait_setup+0x330/0x330
[   51.734735]  [<ffffffff810cc640>] ? native_set_pte_at+0xe0/0xe0
[   51.740763]  [<ffffffff81508bdd>] ? do_huge_pmd_anonymous_page+0x52d/0x9d0
[   51.747744]  [<ffffffff8129b4a0>] ? clock_was_set_work+0x30/0x30
[   51.753854]  [<ffffffff812d07b2>] do_futex+0x2a2/0x1770
[   51.759185]  [<ffffffff812d0510>] ? exit_robust_list+0x220/0x220
[   51.765297]  [<ffffffff838bfce9>] ? retint_kernel+0x2d/0x2d
[   51.770978]  [<ffffffff8122e69b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   51.777786]  [<ffffffff8129a70a>] ? ktime_add_safe+0xea/0x150
[   51.783637]  [<ffffffff8129a620>] ? SyS_alarm+0x20/0x20
[   51.788967]  [<ffffffff810cbeb3>] ? kvm_clock_read+0x23/0x40
[   51.794730]  [<ffffffff810cbed9>] ? kvm_clock_get_cycles+0x9/0x10
[   51.800930]  [<ffffffff812d281d>] ? compat_SyS_futex+0x26d/0x2f0
[   51.807044]  [<ffffffff812d2789>] compat_SyS_futex+0x1d9/0x2f0
[   51.812984]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   51.819963]  [<ffffffff810d724e>] ? __bad_area_nosemaphore+0x21e/0x310
[   51.826600]  [<ffffffff81006b4b>] ? do_fast_syscall_32+0xdb/0x8b0
[   51.832802]  [<ffffffff812d25b0>] ? compat_SyS_get_robust_list+0x310/0x310
[   51.839782]  [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0
[   51.845896]  [<ffffffff838c0a2a>] sysenter_flags_fixed+0xd/0x17
executing program
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[   51.851917] 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 
[   51.878485] RIP  [<ffffffff8141df65>] unlock_page+0x115/0x150
[   51.884456]  RSP <ffff8801cf2cf760>
[   51.888370] ---[ end trace db0f3ff3db0daa9c ]---
[   51.893641] Kernel panic - not syncing: Fatal exception
[   51.899345] Dumping ftrace buffer:
[   51.902859]    (ftrace buffer empty)
[   51.906538] Kernel Offset: disabled
[   51.910134] Rebooting in 86400 seconds..