[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.633570] 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: [   26.866409] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   27.352539] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
[   27.926970] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available)
[   28.103107] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available)
Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts.
[   33.632199] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available)
executing program
[   33.722442] BUG: unable to handle kernel paging request at ffffeafffd418008
[   33.729784] IP: [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   33.736049] PGD 0 
[   33.738286] Oops: 0000 [#1] PREEMPT SMP KASAN
[   33.743218] Dumping ftrace buffer:
[   33.746727]    (ftrace buffer empty)
[   33.750412] Modules linked in:
[   33.753695] CPU: 1 PID: 3846 Comm: syz-executor919 Not tainted 4.4.150-g5541782 #19
[   33.761457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.770795] task: ffff8801c72d0000 task.stack: ffff8800ad110000
[   33.776822] RIP: 0010:[<ffffffff814bcece>]  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   33.785500] RSP: 0018:ffff8800ad117948  EFLAGS: 00010246
[   33.791037] RAX: dffffc0000000000 RBX: ffffeafffd418000 RCX: 0000000000000000
[   33.798281] RDX: 1ffffd5fffa83001 RSI: ffffffff814bceaf RDI: ffffeafffd418008
[   33.805525] RBP: ffff8800ad117958 R08: ffffffff85363fb0 R09: 0000000000000000
[   33.812776] R10: 0000000000000001 R11: ffff8801c72d0000 R12: 0000000000000001
[   33.820019] R13: 1ffff10015a22f2f R14: ffff8800b0226800 R15: ffffeafffd418000
[   33.827261] FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   33.835457] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   33.841317] CR2: ffffeafffd418008 CR3: 00000000af015000 CR4: 00000000001606f0
[   33.848572] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.855818] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.863057] Stack:
[   33.865183]  ffff8800ad117bd8 0000000000000001 ffff8800ad117a00 ffffffff8150ad13
[   33.873156]  00003fff506001e0 00003fff506001e0 0000000041b58ab3 ffffffff841ef837
[   33.881457]  ffffffff8150ab10 00000000000004f0 ffff8800b5210790 ffff8800ad1179c8
[   33.889441] Call Trace:
[   33.892003]  [<ffffffff8150ad13>] zap_huge_pmd+0x203/0x510
[   33.897598]  [<ffffffff8150ab10>] ? __pmd_trans_huge_lock+0x320/0x320
[   33.904148]  [<ffffffff81499333>] unmap_single_vma+0xea3/0x1240
[   33.910175]  [<ffffffff81498490>] ? vm_normal_page+0x280/0x280
[   33.916119]  [<ffffffff814471c0>] ? __put_single_page+0x60/0x60
[   33.922151]  [<ffffffff8149b221>] unmap_vmas+0x81/0xd0
[   33.927398]  [<ffffffff814b3b89>] exit_mmap+0x1c9/0x3a0
[   33.932732]  [<ffffffff814b39c0>] ? SyS_remap_file_pages+0x870/0x870
[   33.939195]  [<ffffffff814faa64>] ? kmem_cache_free+0x2b4/0x340
[   33.945226]  [<ffffffff811283f8>] mmput+0xf8/0x2d0
[   33.950126]  [<ffffffff81138088>] do_exit+0x8d8/0x26b0
[   33.955378]  [<ffffffff81c69013>] ? file_map_prot_check+0x193/0x310
[   33.961756]  [<ffffffff811377b0>] ? release_task.part.17+0x1200/0x1200
[   33.968395]  [<ffffffff814b75ae>] ? SyS_mprotect+0x41e/0x640
[   33.974168]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   33.979417]  [<ffffffff814b75b3>] ? SyS_mprotect+0x423/0x640
[   33.985189]  [<ffffffff8113e0d1>] do_group_exit+0x111/0x330
[   33.990872]  [<ffffffff8113e2f0>] ? do_group_exit+0x330/0x330
[   33.996725]  [<ffffffff8113e30d>] SyS_exit_group+0x1d/0x20
[   34.002321]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   34.008439]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   34.014473] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 <f6> 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 
[   34.041178] RIP  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   34.047505]  RSP <ffff8800ad117948>
[   34.051099] CR2: ffffeafffd418008
[   34.054524] ---[ end trace d009e42c7c9bed2e ]---
[   34.059249] Kernel panic - not syncing: Fatal exception
[   34.064915] Dumping ftrace buffer:
[   34.068432]    (ftrace buffer empty)
[   34.072113] Kernel Offset: disabled
[   34.075711] Rebooting in 86400 seconds..