[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.165472] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.513601] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   24.846452] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   25.602124] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available)
[   27.813926] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available)
Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts.
[   33.661471] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available)
executing program
[   33.750092] BUG: unable to handle kernel paging request at ffffeafff8d60008
[   33.757641] IP: [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   33.763913] PGD 0 
[   33.766176] Oops: 0000 [#1] PREEMPT SMP KASAN
[   33.771179] Dumping ftrace buffer:
[   33.774726]    (ftrace buffer empty)
[   33.778472] Modules linked in:
[   33.781894] CPU: 0 PID: 3841 Comm: syz-executor396 Not tainted 4.4.150-g5541782 #83
[   33.789671] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.799042] task: ffff8801c8b00000 task.stack: ffff8801d9038000
[   33.805086] RIP: 0010:[<ffffffff814bcece>]  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   33.813905] RSP: 0018:ffff8801d903f9c0  EFLAGS: 00010246
[   33.819342] RAX: dffffc0000000000 RBX: ffffeafff8d60000 RCX: 0000000000000000
[   33.826600] RDX: 1ffffd5fff1ac001 RSI: ffffffff814bceaf RDI: ffffeafff8d60008
[   33.833861] RBP: ffff8801d903f9d0 R08: ffffffff85363fb0 R09: 0000000000000000
[   33.841120] R10: 0000000000000001 R11: ffff8801c8b00000 R12: 0000000000000001
[   33.848376] R13: 1ffff1003b207f3e R14: ffff8801cad29800 R15: ffffeafff8d60000
[   33.855636] FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   33.863898] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.869770] CR2: ffffeafff8d60008 CR3: 00000001d0997000 CR4: 00000000001606f0
[   33.877030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.884288] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.891541] Stack:
[   33.893674]  ffff8801d903fc50 0000000000000001 ffff8801d903fa78 ffffffff8150ad13
[   33.901741]  00003ffe358001e0 00003ffe358001e0 0000000041b58ab3 ffffffff841ef837
[   33.909786]  ffffffff8150ab10 00000000000004f0 ffff8801d0829b00 ffff8801d903fa40
[   33.917900] Call Trace:
[   33.920525]  [<ffffffff8150ad13>] zap_huge_pmd+0x203/0x510
[   33.926141]  [<ffffffff8150ab10>] ? __pmd_trans_huge_lock+0x320/0x320
[   33.932739]  [<ffffffff81499333>] unmap_single_vma+0xea3/0x1240
[   33.938842]  [<ffffffff81498490>] ? vm_normal_page+0x280/0x280
[   33.944849]  [<ffffffff814471c0>] ? __put_single_page+0x60/0x60
[   33.950895]  [<ffffffff8149b221>] unmap_vmas+0x81/0xd0
[   33.956205]  [<ffffffff814b3b89>] exit_mmap+0x1c9/0x3a0
[   33.961561]  [<ffffffff814b39c0>] ? SyS_remap_file_pages+0x870/0x870
[   33.968042]  [<ffffffff81238a6f>] ? lock_acquire+0x19f/0x450
[   33.973829]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   33.979094]  [<ffffffff811283f8>] mmput+0xf8/0x2d0
[   33.984012]  [<ffffffff81138088>] do_exit+0x8d8/0x26b0
[   33.989277]  [<ffffffff81c69013>] ? file_map_prot_check+0x193/0x310
[   33.995674]  [<ffffffff811377b0>] ? release_task.part.17+0x1200/0x1200
[   34.002358]  [<ffffffff814b75ae>] ? SyS_mprotect+0x41e/0x640
[   34.008196]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   34.013466]  [<ffffffff814b75b3>] ? SyS_mprotect+0x423/0x640
[   34.019256]  [<ffffffff838cbc58>] ? retint_user+0x18/0x3c
[   34.024782]  [<ffffffff8113e0d1>] do_group_exit+0x111/0x330
[   34.030481]  [<ffffffff81003017>] ? trace_hardirqs_on_thunk+0x17/0x19
[   34.037051]  [<ffffffff8113e30d>] SyS_exit_group+0x1d/0x20
[   34.042667]  [<ffffffff838cb0a5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   34.049429] 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 
[   34.077351] RIP  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   34.083730]  RSP <ffff8801d903f9c0>
[   34.087340] CR2: ffffeafff8d60008
[   34.090835] ---[ end trace 7ea3e0967f67d179 ]---
[   34.095576] Kernel panic - not syncing: Fatal exception
[   34.101405] Dumping ftrace buffer:
[   34.104945]    (ftrace buffer empty)
[   34.109019] Kernel Offset: disabled
[   34.112633] Rebooting in 86400 seconds..