syzbot

random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available)
BUG: unable to handle kernel paging request at ffffeafff8d70008
IP: [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260 mm/rmap.c:1278
PGD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3851 Comm: syz-executor424 Not tainted 4.4.150-g5541782 #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9be4800 task.stack: ffff8801c6498000
RIP: 0010:[<ffffffff814bcece>]  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260 mm/rmap.c:1278
RSP: 0018:ffff8801c649f9c0  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffeafff8d70000 RCX: 0000000000000000
RDX: 1ffffd5fff1ae001 RSI: ffffffff814bceaf RDI: ffffeafff8d70008
RBP: ffff8801c649f9d0 R08: ffffffff85363fb0 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8801d9be4800 R12: 0000000000000001
R13: 1ffff10038c93f3e R14: ffff8801cac58800 R15: ffffeafff8d70000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffeafff8d70008 CR3: 00000001ce141000 CR4: 00000000001606f0
Stack:
 ffff8801c649fc50 0000000000000001 ffff8801c649fa78 ffffffff8150ad13
 00003ffe35c001e0 00003ffe35c001e0 0000000041b58ab3 ffffffff841ef837
 ffffffff8150ab10 00000000000004f0 ffff8801caee6580 ffff8801c649fa40
Call Trace:
 [<ffffffff8150ad13>] zap_huge_pmd+0x203/0x510 mm/huge_memory.c:1493
 [<ffffffff81499333>] zap_pmd_range mm/memory.c:1249 [inline]
 [<ffffffff81499333>] zap_pud_range mm/memory.c:1283 [inline]
 [<ffffffff81499333>] unmap_page_range mm/memory.c:1307 [inline]
 [<ffffffff81499333>] unmap_single_vma+0xea3/0x1240 mm/memory.c:1352
 [<ffffffff8149b221>] unmap_vmas+0x81/0xd0 mm/memory.c:1382
 [<ffffffff814b3b89>] exit_mmap+0x1c9/0x3a0 mm/mmap.c:2958
 [<ffffffff811283f8>] __mmput kernel/fork.c:717 [inline]
 [<ffffffff811283f8>] mmput+0xf8/0x2d0 kernel/fork.c:737
 [<ffffffff81138088>] exit_mm kernel/exit.c:440 [inline]
 [<ffffffff81138088>] do_exit+0x8d8/0x26b0 kernel/exit.c:742
 [<ffffffff8113e0d1>] do_group_exit+0x111/0x330 kernel/exit.c:885
 [<ffffffff8113e30d>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff8113e30d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff838cb0a5>] entry_SYSCALL_64_fastpath+0x22/0x9e
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 
RIP  [<ffffffff814bcece>] page_remove_rmap+0x2e/0x260 mm/rmap.c:1278
 RSP <ffff8801c649f9c0>
CR2: ffffeafff8d70008
---[ end trace cf10794a1fd5c63f ]---