BUG: unable to handle kernel paging request in corrupted

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
c18bb396d3d261ebbb4efbc05129c5d354c541e4 (Tue Apr 10 00:04:10 2018 +0000)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=bb6ed94ce15c5cd0be00

syzkaller reproducer:  
https://syzkaller.appspot.com/x/repro.syz?id=6361086471176192
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=5146710238035968
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=-1223000601505858474
compiler: gcc (GCC) 8.0.1 20180301 (experimental)

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Reported-by: syzbot+bb6ed94ce15c5cd0be00@xxxxxxxxxxxxxxxxxxxxxxxxx
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IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
BUG: unable to handle kernel paging request at 0000000000005b63
PGD 1b67b2067 P4D 1b67b2067 PUD 1b67b3067 PMD 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4510 Comm: syz-executor5 Not tainted 4.16.0+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
==================================================================
BUG: KASAN: out-of-bounds in vsnprintf+0x1a3b/0x1b40 lib/vsprintf.c:2315
Read of size 8 at addr -02 ï ïïïe ï6 ï  a by task syz-executor5/4510

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#2] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4510 Comm: syz-executor5 Not tainted 4.16.0+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: b08e6540:die_lock+0x0/0x4
RSP: b08e6568:ffffffff81b2a8f1 EFLAGS: ffff8801b08e61e8 ORIG_RAX:  
ffffed003611cc58
RAX: 1ffffffff10842bc RBX: ffff8801db021849 RCX: ffffffff874b04e3
RDX: 0000000000000000 RSI: ffffffff874b02f9 RDI: 0000000000000001
RBP: ffff8801b08e6568 R08: ffff8801c322e040 R09: ffffed003b6042bc
R10: ffffed003b6042bc R11: ffff8801db0215e3 R12: ffffffff884215e0
R13: ffffed003611cc58 R14: ffffffff898d54ec R15: ffff8801b08e6540
FS:  00007ff89fb7d700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000005b63 CR3: 00000001b67b1000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 <01> 00 00 00  
02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RIP: die_lock+0x0/0x4 RSP: ffffffff81b2a8f1
---[ end trace 4c7524c29b994875 ]---


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