audit: type=1400 audit(1516307094.989:7): avc:  denied  { map } for  pid=3662 comm="syzkaller420494" path="/root/syzkaller420494801" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3662 Comm: syzkaller420494 Not tainted 4.15.0-rc8-next-20180118+ #100
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nfs_idmap_prepare_pipe_upcall fs/nfs/nfs4idmap.c:537 [inline]
RIP: 0010:nfs_idmap_legacy_upcall+0x290/0x4f0 fs/nfs/nfs4idmap.c:588
RSP: 0018:ffff8801d980fbd0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff1003b301f7c RCX: ffffffff820a93d7
RDX: 0000000000000005 RSI: 1ffff1003b3639fb RDI: 0000000000000028
RBP: ffff8801d980fc68 R08: 1ffff1003b301f29 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d954b580 R14: 1ffff1003b301f80 R15: ffff8801d96bfe80
FS:  0000000001237880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f5803ab0f0 CR3: 00000001bcb1e002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 construct_key security/keys/request_key.c:235 [inline]
 construct_key_and_link security/keys/request_key.c:484 [inline]
 request_key_and_link+0x10fd/0x16c0 security/keys/request_key.c:593
 SYSC_request_key security/keys/keyctl.c:213 [inline]
 SyS_request_key+0x18c/0x2d0 security/keys/keyctl.c:158
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x43fce9
RSP: 002b:00007ffec14199c8 EFLAGS: 00000217 ORIG_RAX: 00000000000000f9
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9
RDX: 0000000020000000 RSI: 0000000020000000 RDI: 0000000020005ff6
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000fffffffe R11: 0000000000000217 R12: 0000000000401610
R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000
Code: 89 85 68 ff ff ff 66 41 89 14 06 78 47 e8 b9 64 66 ff 48 8b 85 70 ff ff ff 48 8d 78 28 48 8b 85 68 ff ff ff 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 39 02 00 00 48 8b 85 70 ff ff ff 48 83 78 28 
RIP: nfs_idmap_prepare_pipe_upcall fs/nfs/nfs4idmap.c:537 [inline] RSP: ffff8801d980fbd0
RIP: nfs_idmap_legacy_upcall+0x290/0x4f0 fs/nfs/nfs4idmap.c:588 RSP: ffff8801d980fbd0
---[ end trace 11f1e7470b65e6ce ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..