[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.809784] 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: [   25.904837] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.231866] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.928103] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available)
[   38.410752] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available)
Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts.
[   43.999295] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available)
executing program
[   44.085168] BUG: unable to handle kernel paging request at ffffeafff8b80008
[   44.092581] IP: [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   44.098938] PGD 0 
[   44.101178] Oops: 0000 [#1] PREEMPT SMP KASAN
[   44.106130] Dumping ftrace buffer:
[   44.109641]    (ftrace buffer empty)
[   44.113326] Modules linked in:
[   44.117044] CPU: 0 PID: 3856 Comm: syz-executor857 Not tainted 4.4.150-g5541782 #19
[   44.124812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.134141] task: ffff8801d9358000 task.stack: ffff8801d9220000
[   44.140170] RIP: 0010:[<ffffffff814bcece>]  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   44.148848] RSP: 0018:ffff8801d9227948  EFLAGS: 00010246
[   44.154268] RAX: dffffc0000000000 RBX: ffffeafff8b80000 RCX: 0000000000000000
[   44.161509] RDX: 1ffffd5fff170001 RSI: ffffffff814bceaf RDI: ffffeafff8b80008
[   44.168842] RBP: ffff8801d9227958 R08: ffffffff85363fb0 R09: 0000000000000000
[   44.176090] R10: 0000000000000001 R11: ffff8801d9358000 R12: 0000000000000001
[   44.183330] R13: 1ffff1003b244f2f R14: ffff8801d2756800 R15: ffffeafff8b80000
[   44.190572] FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   44.198771] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   44.204626] CR2: ffffeafff8b80008 CR3: 00000001d23f8000 CR4: 00000000001606f0
[   44.211874] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   44.219118] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   44.226361] Stack:
[   44.228484]  ffff8801d9227bd8 0000000000000001 ffff8801d9227a00 ffffffff8150ad13
[   44.236601]  00003ffe2e0001e0 00003ffe2e0001e0 0000000041b58ab3 ffffffff841ef837
[   44.244592]  ffffffff8150ab10 00000000000004f0 ffff8801da2fdcb8 ffff8801d92279c8
[   44.252655] Call Trace:
[   44.255220]  [<ffffffff8150ad13>] zap_huge_pmd+0x203/0x510
[   44.260820]  [<ffffffff8150ab10>] ? __pmd_trans_huge_lock+0x320/0x320
[   44.267378]  [<ffffffff81499333>] unmap_single_vma+0xea3/0x1240
[   44.273421]  [<ffffffff81498490>] ? vm_normal_page+0x280/0x280
[   44.279369]  [<ffffffff814471c0>] ? __put_single_page+0x60/0x60
[   44.285411]  [<ffffffff8149b221>] unmap_vmas+0x81/0xd0
[   44.290705]  [<ffffffff814b3b89>] exit_mmap+0x1c9/0x3a0
[   44.296049]  [<ffffffff814b39c0>] ? SyS_remap_file_pages+0x870/0x870
[   44.302517]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   44.307774]  [<ffffffff811283f8>] mmput+0xf8/0x2d0
[   44.312673]  [<ffffffff81138088>] do_exit+0x8d8/0x26b0
[   44.317924]  [<ffffffff81c69013>] ? file_map_prot_check+0x193/0x310
[   44.324303]  [<ffffffff811377b0>] ? release_task.part.17+0x1200/0x1200
[   44.330942]  [<ffffffff814b75ae>] ? SyS_mprotect+0x41e/0x640
[   44.336714]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   44.341960]  [<ffffffff814b75b3>] ? SyS_mprotect+0x423/0x640
[   44.347731]  [<ffffffff8113e0d1>] do_group_exit+0x111/0x330
[   44.353524]  [<ffffffff8113e2f0>] ? do_group_exit+0x330/0x330
[   44.359391]  [<ffffffff8113e30d>] SyS_exit_group+0x1d/0x20
[   44.365002]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   44.371121]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   44.377217] 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 
[   44.403966] RIP  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   44.410303]  RSP <ffff8801d9227948>
[   44.413898] CR2: ffffeafff8b80008
[   44.417325] ---[ end trace 0d6283fed9775085 ]---
[   44.422049] Kernel panic - not syncing: Fatal exception
[   44.427712] Dumping ftrace buffer:
[   44.431229]    (ftrace buffer empty)
[   44.434911] Kernel Offset: disabled
[   44.438527] Rebooting in 86400 seconds..