[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   21.328256] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   27.972631] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   28.297799] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available)
[   28.998508] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available)
[   29.150050] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available)
Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts.
[   34.661956] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available)
executing program
[   34.757978] BUG: unable to handle kernel paging request at ffffeafff8bd0008
[   34.765396] IP: [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   34.771640] PGD 0 
[   34.773880] Oops: 0000 [#1] PREEMPT SMP KASAN
[   34.778908] Dumping ftrace buffer:
[   34.782419]    (ftrace buffer empty)
[   34.786102] Modules linked in:
[   34.789389] CPU: 0 PID: 3797 Comm: syz-executor943 Not tainted 4.4.150-g5541782 #19
[   34.797155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.806493] task: ffff8801d943c800 task.stack: ffff8801d97c0000
[   34.812523] RIP: 0010:[<ffffffff814bcece>]  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   34.821223] RSP: 0018:ffff8801d97c7948  EFLAGS: 00010246
[   34.826644] RAX: dffffc0000000000 RBX: ffffeafff8bd0000 RCX: 0000000000000000
[   34.833889] RDX: 1ffffd5fff17a001 RSI: ffffffff814bceaf RDI: ffffeafff8bd0008
[   34.841133] RBP: ffff8801d97c7958 R08: ffffffff85363fb0 R09: 0000000000000000
[   34.848381] R10: 0000000000000001 R11: ffff8801d943c800 R12: 0000000000000001
[   34.855627] R13: 1ffff1003b2f8f2f R14: ffff8801d1bb4800 R15: ffffeafff8bd0000
[   34.862874] FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   34.871078] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   34.876930] CR2: ffffeafff8bd0008 CR3: 00000001d18b1000 CR4: 00000000001606f0
[   34.884175] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   34.891450] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   34.898693] Stack:
[   34.900820]  ffff8801d97c7bd8 0000000000000001 ffff8801d97c7a00 ffffffff8150ad13
[   34.908807]  00003ffe2f4001e0 00003ffe2f4001e0 0000000041b58ab3 ffffffff841ef837
[   34.916793]  ffffffff8150ab10 00000000000004f0 ffff8801caa4e5d8 ffff8801d97c79c8
[   34.924808] Call Trace:
[   34.927375]  [<ffffffff8150ad13>] zap_huge_pmd+0x203/0x510
[   34.932976]  [<ffffffff8150ab10>] ? __pmd_trans_huge_lock+0x320/0x320
[   34.939544]  [<ffffffff81499333>] unmap_single_vma+0xea3/0x1240
[   34.945576]  [<ffffffff81498490>] ? vm_normal_page+0x280/0x280
[   34.951525]  [<ffffffff814471c0>] ? __put_single_page+0x60/0x60
[   34.957556]  [<ffffffff8149b221>] unmap_vmas+0x81/0xd0
[   34.962810]  [<ffffffff814b3b89>] exit_mmap+0x1c9/0x3a0
[   34.968148]  [<ffffffff814b39c0>] ? SyS_remap_file_pages+0x870/0x870
[   34.974615]  [<ffffffff814faa64>] ? kmem_cache_free+0x2b4/0x340
[   34.980662]  [<ffffffff811283f8>] mmput+0xf8/0x2d0
[   34.985565]  [<ffffffff81138088>] do_exit+0x8d8/0x26b0
[   34.990828]  [<ffffffff81c69013>] ? file_map_prot_check+0x193/0x310
[   35.004280]  [<ffffffff811377b0>] ? release_task.part.17+0x1200/0x1200
[   35.010921]  [<ffffffff814b75ae>] ? SyS_mprotect+0x41e/0x640
[   35.016695]  [<ffffffff81228ada>] ? up_write+0x1a/0x60
[   35.021945]  [<ffffffff814b75b3>] ? SyS_mprotect+0x423/0x640
[   35.027717]  [<ffffffff8113e0d1>] do_group_exit+0x111/0x330
[   35.033406]  [<ffffffff8113e2f0>] ? do_group_exit+0x330/0x330
[   35.039296]  [<ffffffff8113e30d>] SyS_exit_group+0x1d/0x20
[   35.044893]  [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0
[   35.051371]  [<ffffffff838cca03>] sysenter_flags_fixed+0xd/0x1a
[   35.057415] 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 
[   35.084270] RIP  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260
[   35.090598]  RSP <ffff8801d97c7948>
[   35.094192] CR2: ffffeafff8bd0008
[   35.097617] ---[ end trace 709c2ddda8cb3182 ]---
[   35.102342] Kernel panic - not syncing: Fatal exception
[   35.108086] Dumping ftrace buffer:
[   35.111607]    (ftrace buffer empty)
[   35.115290] Kernel Offset: disabled
[   35.118891] Rebooting in 86400 seconds..